Dimensional analysis, unit conversion, and general physics reference calculators. Browse our free general physics tools below — all calculators are instant, accurate, and require no sign-up.
Air Density Calculator — Calculate air density from pressure, temperature, and humidity using the ideal gas law. Includes altitude reference table and moist air corrections.
Angle of Repose Calculator — Calculate the angle of repose for granular materials. Find pile height, volume, slope ratio, and stability from friction coefficient and density.
Angle of Twist Calculator — Calculate angle of twist, shear stress, and torsional stiffness for solid or hollow shafts under torque. Compare materials instantly.
Attenuation Calculator — Calculate signal attenuation through cables, fiber, or free space. Find total loss in dB, output power, and half-power distance with connector and splice losses.
Ballistic Coefficient Calculator — Calculate ballistic coefficient, sectional density, drag force, and muzzle energy for projectiles. Compare G1/G7 models with built-in presets.
Bank Angle Calculator — Calculate bank angle, turn radius, load factor, and turn rate for aircraft or vehicles in coordinated turns. Includes G-force and stall speed factor.
Barn-Pole Paradox Calculator — Explore the barn-pole (ladder) paradox of special relativity. Calculate Lorentz contraction, simultaneity gaps, and see why both frames give consistent but surprising results.
Belt Length Calculator — Calculate V-belt or flat belt length for two-pulley and crossed-belt drives. Find speed ratio, driven RPM, belt speed, and contact angle.
Bend Allowance Calculator — Calculate bend allowance, bend deduction, flat blank length, and outside setback for sheet metal bending. Supports multiple materials and K-factors.
Binoculars Range Calculator — Calculate exit pupil, twilight factor, field of view, and apparent target size for any binoculars. Compare models for birding, astronomy, and hunting.
Biot Number Calculator — Calculate the Biot number to determine if lumped capacitance analysis applies. Compare internal vs external thermal resistance for heat transfer problems.
Black Hole Calculator — Calculate Schwarzschild radius, Hawking temperature, photon sphere, ISCO, evaporation time, and time dilation for any black hole mass.
Blackbody Radiation Calculator — Calculate Wien peak wavelength, Stefan-Boltzmann power, Planck spectral radiance, and emission color for any temperature. Explore blackbody physics with star presets.
Blast Radius Calculator — Calculate blast overpressure zones, damage radii, and fireball size for explosions using Hopkinson-Cranz scaling. Educational physics tool.
Boltzmann Factor Calculator — Calculate Boltzmann factors, population ratios, and partition functions for two-level systems. Explore thermal physics with temperature and energy presets.
Boyle's Law Calculator — Calculate final pressure or volume using Boyle's Law (P₁V₁ = P₂V₂). Supports kPa, atm, psi, bar, mmHg with isothermal work and compression ratio.
Boost Converter Calculator — Design a boost (step-up) DC-DC converter: calculate duty cycle, inductor current, ripple, critical inductance, and component stress for any input/output voltage.
Bragg's Law Calculator — Calculate Bragg diffraction angle, d-spacing, or wavelength using nλ = 2d sin θ. Includes higher-order reflections, momentum transfer, and X-ray source reference.
Breaker Size Calculator — Calculate the correct circuit breaker size, wire gauge, voltage drop, and power loss for any electrical load. NEC-compliant with AWG wire reference table.
Brinell Hardness Number Calculator — Calculate Brinell Hardness Number (BHN) from test force and indentation diameter. Includes material reference table and UTS estimation.
Bridge Rectifier Calculator — Design a full-wave bridge rectifier: calculate DC output voltage, ripple, capacitor sizing, PIV, diode current, and efficiency for any AC input.
Buck Converter Calculator — Design a buck (step-down) DC-DC converter: calculate duty cycle, inductor ripple, critical inductance, efficiency, and component stress for any input/output voltage.
Broad-Crested Weir Calculator — Calculate discharge, critical depth, crest velocity, and Froude number for broad-crested weirs. Includes approach velocity correction, H/L validity, and Cd reference.
Bug-Rivet Paradox Calculator — Explore the bug-rivet (barn-pole) paradox of special relativity. Calculate Lorentz contraction, time dilation, and frame-dependent simultaneity for any speed.
Euler Buckling Calculator — Calculate Euler critical buckling load, Johnson formula, slenderness ratio, safety factor, and effective length for columns. Includes end-condition K factors.
Car Jump Distance Calculator — Calculate how far a car, motorcycle, or bike jumps off a ramp. Factors in launch angle, speed, ramp height, and landing elevation with trajectory analysis.
Bulk Modulus Calculator — Calculate bulk modulus from pressure and volume changes or look up values for common materials. Includes compressibility and stiffness comparison chart.
Carburetor CFM Calculator — Calculate the correct carburetor CFM sizing for any engine. Factors in displacement, RPM, volumetric efficiency, and barrel count with common carb reference.
Car Center of Mass Calculator — Calculate vehicle center of mass from front and rear axle weights. Weight distribution percentage, CG position, and weight transfer analysis.
Charles's Law Calculator — Calculate volume changes of a gas with temperature using Charles's Law (V₁/T₁ = V₂/T₂). Supports °C, °F, K with work done and gas law reference.
Circular Motion Calculator — Calculate centripetal acceleration, force, angular velocity, period, bank angle, and g-force for uniform circular motion. Covers cars, coasters, satellites, centrifuges.
Cloud Base Calculator — Estimate cloud base altitude from temperature and dewpoint spread or relative humidity. Includes AGL/MSL conversion, Henning formula, and pilot reference tables.
Compressibility Calculator — Calculate compressibility, bulk modulus, volume change, speed of sound, Mach number, and acoustic impedance for any material. Compare fluids, gases, and solids.
Copper Wire Weight Calculator — Calculate the weight of copper wire by AWG gauge and length. Includes AWG reference table, resistance estimation, and material cost approximation.
Crawl Ratio Calculator — Calculate your 4×4 crawl ratio from transfer case, transmission, and axle ratios. Includes wheel torque, tractive force, grade ability, and speed at RPM.
Cube Density Calculator — Calculate the density of a cube from its side length and mass. Identify materials by comparing against a reference database of common substances.
Crossover Calculator — Calculate audio crossover network component values for Butterworth and Linkwitz-Riley filters with 1st through 4th order designs.
Curie's Law Calculator — Calculate magnetic susceptibility using Curie's Law and the Curie–Weiss Law for paramagnetic and ferromagnetic materials at any temperature.
Curie Constant Calculator — Calculate the Curie constant, paramagnetic susceptibility, and Weiss molecular field for ferromagnetic and paramagnetic materials.
Daylight Calculator — Calculate sunrise, sunset, daylight hours, and twilight durations for any latitude and day of the year using solar position equations.
Decibel (dB) Calculator — Convert between decibels, power ratios, and voltage ratios. Combine sound levels, compare intensities, and explore dB scales.
Delta to Wye (Δ-Y) Calculator — Convert between delta (Δ) and wye (Y) resistor configurations for three-phase circuits with impedance ratios and power calculations.
Debye Length Calculator — Calculate the Debye screening length for electrolytes, plasmas, and semiconductors. Determine electrostatic screening distances and ionic strength.
Delta-v Calculator — Calculate rocket delta-v using the Tsiolkovsky equation. Determine propellant requirements, mass ratios, and mission feasibility for space travel.
Density Calculator — Calculate density from mass and volume with extensive unit conversions. Material database with 23+ substances for identification and comparison.
Density Altitude Calculator — Calculate density altitude from pressure altitude, temperature, and dew point. Aviation and athletics performance tool with impact reference table.
Cylinder Density Calculator — Calculate the density of a cylinder from diameter, height, and mass. Material identification, volume, surface area, and reference comparison table.
Density to Mass Calculator — Calculate mass from density and volume for cubes, spheres, cylinders, and boxes. Material database with comparison table for same-volume masses.
Density Mass Volume Calculator — Solve for any of density, mass, or volume using the triangle relationship ρ = m/V. Unit conversions, material database, and visual triangle display.
Diopter Calculator — Calculate lens power in diopters, convert prescriptions between forms, compute focal lengths, and estimate contact lens power from spectacle Rx.
Density to Weight Calculator — Convert density and volume to weight in Newtons, pounds-force, and kgf. Supports Earth, Moon, Mars, and Jupiter gravity with material comparison.
Electric Dipole Calculator — Calculate electric dipole fields, potentials, torque, and energy. Convert between C·m and Debye units with distance-dependent field analysis.
Dipole Moment Calculator — Calculate molecular dipole moments from charge and bond length. Convert between Debye, C·m, and esu·cm units with ionic character analysis.
Displacement Calculator — Calculate displacement, velocity, and acceleration using kinematic equations. Supports 1D and 2D motion with time-evolution tables.
Distance Attenuation Calculator — Calculate sound pressure level attenuation over distance for point and line sources with air absorption and atmospheric effects.
Distance to Horizon Calculator — Calculate how far you can see to the horizon based on observer elevation, atmospheric refraction, and target height using Earth geometry.
Earth Curvature Calculator — Calculate the curvature drop, bulge, and hidden height of objects over distance on a spherical Earth with optional refraction correction.
Effectiveness-NTU Calculator — Calculate heat exchanger effectiveness using the ε-NTU method for counter-flow, parallel-flow, shell-and-tube, and crossflow configurations.
Efficiency Calculator — Calculate mechanical, electrical, or thermal efficiency from input and output power with energy cost analysis and COP for heat pumps.
EIRP Calculator — Calculate Effective Isotropic Radiated Power from transmitter power, antenna gain, and cable losses with link budget and power density analysis.
Electric Potential Calculator — Calculate electric potential, field strength, and potential energy for point charges with superposition, dielectric effects, and distance analysis.
Electrical Mobility Calculator — Calculate charge carrier mobility, drift velocity, conductivity, diffusion coefficient, and relaxation time in semiconductors and conductors.
Electrical Power Calculator — Calculate electrical power, current, voltage, and resistance with power factor correction, 3-phase support, energy cost analysis, and wire sizing.
Elongation Calculator — Calculate material elongation, stress, strain, and safety factor under tensile load using Hooke's law with force-elongation analysis.
Engine Displacement Calculator — Calculate engine displacement from bore, stroke, and cylinder count in cc, liters, and cubic inches with compression ratio and efficiency analysis.
E = mc² Calculator — Calculate mass-energy equivalence using Einstein's famous equation. Convert between mass and energy with TNT, kWh, MeV, and other unit conversions.
Evaporation Rate Calculator — Calculate water evaporation rate from surface area, temperature, humidity, and wind speed with daily loss estimates and cooling power analysis.
Excess Electrons Calculator — Calculate total charge, surface potential, electric field, and electrostatic energy from excess electrons on a conductor with dielectric analysis.
Exhaust Diameter Calculator — Calculate exhaust pipe diameter from flow rate, temperature, and target velocity with standard pipe sizing, Reynolds number, and pressure drop analysis.
Factor of Safety Calculator — Calculate factor of safety from yield strength, ultimate strength, or buckling load with utilization ratio, margin of safety, and industry standard comparisons.
Fan Calculator — Calculate fan power, airflow, static pressure, brake horsepower, and energy cost with fan affinity laws, efficiency analysis, and RPM scaling.
Fermi Level Calculator — Calculate semiconductor Fermi level position, carrier concentrations, and intrinsic properties from band gap, doping, and temperature with band diagram visualization.
Flat vs Round Earth Distance Calculator — Compare distances calculated using flat-earth Euclidean projection versus spherical Haversine formula to see how curvature affects real-world navigation.
Flyback Converter Calculator — Design flyback converters by computing turns ratio, duty cycle, magnetizing inductance, peak currents, and component stress for isolated DC-DC power supplies.
Forward Converter Calculator — Design forward converter power supplies with turns ratio, duty cycle, output inductor, capacitor sizing, and MOSFET stress calculations.
Free Space Path Loss (FSPL) Calculator — Calculate free space path loss, received signal power, link margin, and maximum range for RF links using the Friis transmission equation.
Fresnel Zone Calculator — Calculate Fresnel zone radii, required clearance heights, and Earth bulge for line-of-sight radio, microwave, and optical links.
Froude Number Calculator — Calculate the Froude number for open-channel flow, ship hull speed, and hydraulic engineering to determine subcritical or supercritical flow regimes.
Fulcrum & Lever Calculator — Calculate torques, mechanical advantage, balance conditions, and required forces for first, second, and third class levers around a fulcrum.
Gas Density Calculator — Calculate ideal gas density from molar mass, temperature, and pressure using ρ = PM/(RT). Presets for 12 common gases with comparison chart.
Gay-Lussac's Law Calculator — Calculate pressure changes with temperature at constant volume using Gay-Lussac's Law (P₁/T₁ = P₂/T₂) for ideal gas behavior.
Generator Power Calculator — Calculate generator kVA, current, torque, fuel consumption, and mechanical input power for single-phase and three-phase electrical generators.
Gold Weight Calculator — Calculate gold weight in grams, troy ounces, and pennyweights. Karat purity analysis with value estimation for coins, bars, and jewelry.
Grams per cm³ Density Calculator — Convert between mass, volume, and density in g/cm³ (g/cc), kg/m³, and lb/ft³. Includes a material density reference table and buoyancy check.
Hall Coefficient Calculator — Calculate the Hall coefficient, Hall voltage, carrier concentration, and mobility for semiconductors and conductors in a magnetic field.
Helical Coil Inductance Calculator — Calculate the inductance, wire length, DC resistance, Q factor, and self-resonant frequency of a helical (solenoid) coil using the Nagaoka correction.
Helmholtz Resonator Calculator — Calculate the resonant frequency, Q factor, and bandwidth of a Helmholtz resonator from cavity volume and neck dimensions for acoustics and audio design.
High-Pass Filter Calculator — Design RC and RL high-pass filters by calculating cutoff frequency, gain, phase shift, rolloff rate, and frequency response table.
Hydrogen-Like Atom Calculator — Calculate energy levels, transition wavelengths, orbital radii, and spectral series for hydrogen-like atoms using the Bohr model.
Ideal Rocket Equation Calculator — Calculate delta-v, exhaust velocity, mass ratio, and propellant fraction using the Tsiolkovsky rocket equation with mission Δv comparisons.
Immersed Weight Calculator — Calculate apparent weight and buoyant force for objects submerged in any fluid. Archimedes principle with 9-fluid comparison and force-balance visual.
Insertion Loss Calculator — Calculate insertion loss in dB, power transmission percentage, cable loss, and signal budget for RF connectors, cables, splices, and components.
Intrinsic Carrier Concentration Calculator — Calculate intrinsic carrier concentration (ni), Fermi level, and thermal voltage for semiconductors like Si, Ge, and GaAs at any temperature.
Inverse Square Law Calculator — Calculate how light, sound, radiation, or gravity intensity changes with distance using the inverse square law, with dB change and distance tables.
Inverting Buck-Boost Converter Calculator — Design an inverting buck-boost converter by calculating duty cycle, inductance, output capacitance, switch stress, and power budget.
Kg to Newtons Calculator — Convert mass in kilograms to weight in newtons on Earth, Moon, Mars, Jupiter, and other planets with force unit conversions.
Knudsen Number Calculator — Calculate the Knudsen number to determine gas flow regime — continuum, slip, transition, or free molecular — from mean free path and characteristic length.
kVA Calculator — Calculate kVA, kW, kVAR, current, and power factor for single-phase and three-phase electrical systems with power triangle visualization.
Lightning Distance Calculator — Calculate how far away lightning struck from the flash-to-thunder delay, with safety zone assessment, storm tracking, and temperature-corrected speed of sound.
LMTD Calculator — Calculate the log mean temperature difference (LMTD) for heat exchangers in counterflow and parallel flow, with required area and effectiveness.
Low-Pass Filter Calculator — Design RC and RL low-pass filters by calculating cutoff frequency, gain, phase shift, rolloff rate, rise time, and frequency response table.
Malus's Law Calculator — Calculate the intensity of polarized light after passing through an analyzer at any angle using Malus's law, with multi-polarizer chain analysis.
Mass to Density Calculator — Calculate density from mass and volume, or solve for any variable in ρ = m/V. Material identification with 12-material comparison scale.
Mean Free Path Calculator — Calculate the mean free path of gas molecules from temperature, pressure, and molecular diameter, with collision frequency and gas property tables.
Mixed Air Calculator — Calculate mixed air temperature, humidity, enthalpy and dew point when two airstreams combine in HVAC systems, with mixing ratio sweep table.
Mixing Ratio of Air Calculator — Calculate humidity mixing ratio, specific humidity, absolute humidity, dew point, enthalpy, and moist air density from temperature, RH, and pressure.
Modulation Calculator — Calculate AM, FM, and PM modulation index, bandwidth (Carson's rule), sideband frequencies, carrier power, and efficiency for radio signals.
Mohr's Circle Calculator — Calculate principal stresses, max shear stress, and rotated stress components using Mohr's circle. Includes Von Mises and Tresca failure criteria.
MOSFET Calculator — Calculate MOSFET drain current, operating region, power dissipation, transconductance, and thermal estimates for N-channel and P-channel devices.
NE555 Astable Calculator — Calculate 555 timer astable frequency, duty cycle, period, and component values. Includes reverse design from target frequency and E24 resistor matching.
Newton's Law of Cooling Calculator — Calculate temperature over time, time to reach a target temperature, or find the cooling constant using Newton's law of cooling with exponential decay.
Newton's Second Law Calculator — Calculate force, mass, or acceleration using F = ma. Includes friction, incline, kinematics, momentum, kinetic energy, and G-force analysis.
Newton's Third Law Calculator — Analyze action-reaction force pairs in collisions, contact forces, and gravitational interactions. Computes impulse, momentum, G-force, and kinetic energy.
NPSH Calculator — Calculate Net Positive Suction Head Available (NPSHa) to prevent pump cavitation. Includes vapor pressure table, margin analysis, and max suction lift.
Number Density Calculator — Calculate particle number density n = N/V from particle count, pressure and temperature, or mass density. Log-scale comparison from interstellar space to solids.
Nusselt Number Calculator — Calculate the Nusselt number, Reynolds, Prandtl, heat transfer coefficient for pipe flow and flat plate using Dittus-Boelter and Gnielinski correlations.
Oblique Shock Calculator — Calculate oblique shock wave angle, downstream Mach number, pressure/density/temperature ratios, and stagnation pressure loss for supersonic flow.
Olbers' Paradox Calculator — Explore why the night sky is dark despite infinite stars. Calculate sky coverage, mean free path to stars, redshift dimming, and effective brightness fraction.
Optical Density Calculator — Calculate optical density, transmittance, and absorbance using Beer-Lambert law. ND filter comparison table with f-stop equivalents for photography.
Stellar Parallax Calculator — Convert stellar parallax to distance in parsecs, light-years, and AU. Compute absolute magnitude, luminosity, and distance modulus with Gaia-era accuracy.
SiPM / PDE Calculator — Calculate SiPM photon detection efficiency, fired microcells, saturation, signal-to-noise ratio, and dark count correction for silicon photomultiplier sensors.
COP / Performance Coefficient Calculator — Calculate coefficient of performance for heat pumps, refrigerators, and air conditioners. Compare actual COP to Carnot limit with SEER/EER conversion.
Poise & Stokes Viscosity Converter — Convert between dynamic (Poise, Pa·s, cP) and kinematic (Stokes, cSt, mm²/s) viscosity units. Includes Saybolt conversion and common fluid reference table.
Poiseuille's Law Calculator — Calculate laminar flow rate, pressure drop, velocity profile, and flow resistance in cylindrical tubes using Poiseuille's equation. Essential for blood flow and pipe sizing.
Poisson's Ratio Calculator — Calculate Poisson's ratio from strain, moduli pairs, or direct input. Derives shear and bulk modulus with 14-material comparison table.
Polar Moment of Inertia Calculator — Calculate polar moment of inertia J for solid/hollow shafts, square and rectangular tubes. Compute shear stress, twist angle, and torsional stiffness.
Pounds per Minute Flow Converter — Convert mass flow rate between lb/min, kg/s, GPM, L/min, and m³/h. Includes pipe velocity estimation and quick conversion reference table.
PSI Pressure Converter — Convert pressure between PSI, kPa, bar, atm, mmHg, inHg, and more. Calculate force on area and water depth equivalent with reference table.
Power Dissipation Calculator — Calculate electrical power dissipation, junction temperature, and thermal derating from voltage, current, and resistance. Includes package thermal reference table.
Prandtl-Meyer Expansion Calculator — Calculate Prandtl-Meyer expansion fan properties: downstream Mach number, isentropic pressure/temperature/density ratios, and PM function values.
Prandtl Number Calculator — Calculate the Prandtl number from fluid properties. Compare thermal and momentum diffusivities, boundary layer ratios, and regime classification for heat transfer analysis.
Propeller Pitch Calculator — Calculate propeller pitch speed, tip speed, tip Mach number, advance ratio, and pitch angle for RC, drone, aircraft, and boat propellers.
Propeller Slip Calculator — Calculate propeller slip percentage from pitch speed and actual speed. Estimate efficiency and compare to typical slip ranges for aircraft, boats, and drones.
Quarter-Mile Calculator — Estimate quarter-mile ET and trap speed from horsepower and weight. Includes 0-60, 1/8 mile, drivetrain loss, altitude correction, and drag racing records.
Radar Horizon Calculator — Calculate radar line-of-sight horizon distance from antenna and target heights. Includes atmospheric refraction (k-factor), Fresnel zone, and target height lookup table.
Cosmological Redshift Calculator — Calculate redshift z from velocity or wavelengths. Compute recession velocity, Hubble distance, lookback time, scale factor, and CMB temperature at any epoch.
Reduced Mass Calculator — Calculate reduced mass μ = m₁m₂/(m₁+m₂) for two or three bodies. Supports kg, amu, electron masses with reference table of common systems.
Refrigerant Capillary Tube Calculator — Size capillary tubes for refrigeration systems. Calculate required length and diameter from cooling capacity, refrigerant type, and operating temperatures.
Relativistic Kinetic Energy Calculator — Calculate relativistic kinetic energy from velocity or vice versa. Compute Lorentz factor, momentum, total energy, time dilation, and classical KE error.
Reverberation Time (RT60) Calculator — Calculate RT60 reverberation time using Sabine and Eyring equations. Add room surfaces with absorption coefficients, assess speech intelligibility, and reference α values.
Rocket Thrust Calculator — Calculate total rocket thrust from mass flow rate, exhaust velocity, and nozzle pressures. Includes Isp, thrust coefficient, and propellant comparison table.
Rockwell Hardness Conversion Calculator — Convert between Rockwell C, Rockwell B, Vickers, and Brinell hardness scales with tensile strength estimation using ASTM E140 conversion data.
SCFM Calculator — Convert between SCFM and ACFM for compressed air systems. Accounts for temperature, pressure, and humidity corrections with pipe sizing reference.
Shaft Size Calculator — Calculate minimum shaft diameter from torque or power/RPM with shock factors, hollow shaft support, and material comparison table.
Shockley Diode Equation Calculator — Calculate diode current from voltage using the Shockley equation. Includes ideality factor, thermal voltage, dynamic resistance, and I-V sweep mode.
Skin Depth Calculator — Calculate electromagnetic skin depth for conductors at any frequency. Includes AC resistance ratio, shielding depth, and material comparison table.
Smartphone Projector Calculator — Calculate projected image size, brightness, and lens placement for a DIY smartphone projector. Includes lens comparison and contrast analysis.
Slenderness Ratio Calculator — Calculate column slenderness ratio, Euler buckling stress, and AISC design capacity for various cross sections and end conditions.
Space Travel Time Calculator — Calculate interstellar travel time with constant acceleration, time dilation, and energy requirements. Includes relativistic proper time and destination reference.
Specific Gas Constant Calculator — Calculate the specific gas constant, cp, cv, density, and speed of sound for any gas. Includes comprehensive gas property reference table.
Sphere Density Calculator — Calculate the density of a sphere from its diameter and mass, or find mass or diameter given density. Includes material matching and moment of inertia.
Stiffness Matrix Calculator — Generate element stiffness matrices for spring, truss, and beam elements in FEA. Visualizes the matrix with DOF labels and material properties.
Stokes Law Calculator — Calculate terminal settling velocity and drag force for spherical particles in viscous fluids. Includes Reynolds number check and multi-fluid comparison.
Stopping Distance Calculator — Calculate total stopping distance from speed, reaction time, road friction, and grade. Includes speed comparison table and surface friction reference.
Sun Angle Calculator — Calculate solar altitude, azimuth, zenith angle, and shadow length for any location, date, and time. Includes hourly sun path table.
Sunrise Calculator — Calculate sunrise, sunset, day length, and civil twilight for any location and date. Includes monthly sunrise/sunset table and polar day/night detection.
Sunset Calculator — Calculate sunset time, twilight phases, golden hour, and monthly sunset table for any location. Includes civil, nautical, and astronomical twilight.
SUVAT Calculator — Solve any SUVAT kinematics equation — enter 3 of 5 variables (s, u, v, a, t) and calculate the remaining two. Includes velocity profile and motion table.
Synodic Period Calculator — Calculate the synodic period between two orbiting bodies. Includes angular velocity, alignment frequency, and planetary synodic period reference table.
Telescope Field of View Calculator — Calculate true field of view, magnification, exit pupil, and resolving power for any telescope and eyepiece combination. Includes eyepiece comparison table.
Thermodynamic Processes Calculator — Calculate work, heat, internal energy change, and entropy for isothermal, isobaric, isochoric, and adiabatic processes. Includes energy balance visualization.
Thin Film Optics Calculator — Calculate reflectance, transmittance, and spectral response of thin film optical coatings. Includes AR coating design, spectral plot, and material reference.
Thrust-to-Weight Ratio Calculator — Calculate thrust-to-weight ratio (TWR) for rockets, aircraft, and drones. Includes multi-engine support, gravity selection, acceleration, and payload estimates.
TNT Equivalent Calculator — Convert between energy (joules, kWh, calories) and TNT equivalent mass. Includes blast radius estimation and explosion reference table.
Toilet Paper Race & Moment of Inertia Calculator — Race different rolling objects down a ramp. Calculate moment of inertia for solid and hollow cylinders, spheres, and toilet paper rolls. See which shape wins!
Torsional Constant Calculator — Calculate the torsional constant (J) for solid circles, hollow tubes, rectangles, and I-beams. Includes shear stress, twist angle, and formula reference.
Torsional Stiffness Calculator — Calculate torsional stiffness (k = GJ/L) for shafts, springs, and torsion bars. Includes deflection, natural frequency, and length comparison table.
Transistor Biasing Calculator — Calculate BJT operating point (Ic, Vce, Vb, Ve) for voltage divider, collector feedback, and emitter feedback biasing. Includes β sensitivity table.
Transmission Calculator — Calculate gear ratios, output RPM, torque multiplication, and power loss for single and two-stage gear trains with efficiency. Includes automotive gear reference.
Twist Rate Calculator — Calculate rifle barrel twist rate stability using Greenhill and Miller formulas. Includes bullet RPM, stability factor, and twist comparison table.
Interstellar Travel Calculator — Calculate relativistic travel times to nearby stars with constant acceleration or cruise speed. Includes time dilation, ship vs Earth time, and interstellar destination table.
Universe Expansion Calculator — Calculate Hubble recession velocity, redshift, lookback time, and Hubble tension for cosmic distances. Includes notable cosmic objects reference table.
Vickers Hardness Number Calculator — Calculate Vickers hardness (HV) from force and diagonal measurements. Convert to Rockwell, Brinell, and tensile strength with material identification.
Volume to Density Calculator — Calculate density from volume and mass with shape-based volume input, material identification, specific gravity, and buoyancy analysis for 22+ materials.
Volume to Mass Calculator — Convert volume to mass using material density. Supports 30+ materials, 5 shape modes, and multiple unit systems with weight comparison tables.
Water Density Calculator — Calculate water density at any temperature (0–100°C), salinity, and pressure. Includes anomalous expansion, viscosity, speed of sound, and density vs temperature table.
Wien's Law Calculator — Calculate peak wavelength from temperature (or vice versa) using Wien's displacement law. Includes spectral distribution, Stefan-Boltzmann power, and color visualization.
Wind Correction Angle Calculator — Calculate wind correction angle (WCA), ground speed, crosswind, headwind/tailwind components for aviation navigation. Includes wind direction comparison table.
Wind Load Calculator — Calculate wind pressure and force on structures using ASCE 7 methodology. Includes exposure categories, height profile, and speed comparison table.
Wing Loading Calculator — Calculate wing loading, aspect ratio, lift coefficients, and stall speed at bank angles. Includes aircraft reference table from paragliders to fighters.
Young's Modulus Calculator — Calculate Young's modulus from stress and strain, force and extension, or derive stress/strain from known E. Includes material database and unit conversion.
Y+ (Y-Plus) Wall Distance Calculator — Calculate first cell height for CFD mesh y⁺ requirements. Includes Reynolds number, friction velocity, boundary layer region guide, and y⁺ reference table.