Area, speed, pressure, energy, data, and sizing converters. Browse our free measurement tools below — all calculators are instant, accurate, and require no sign-up.
Angle Converter — Convert angles between degrees, radians, gradians, turns, and arcminutes. Uses the exact formula radians = degrees × π/180.
Area Converter — Convert between square feet, square meters, acres, hectares, and more. Free online area unit converter for real estate, land, and construction.
ASCII & Unicode Lookup — Look up ASCII and Unicode code points for any character. Convert between characters, decimal, hex, octal, and binary values.
Binary to Decimal Converter — Convert binary numbers to decimal, hexadecimal, and octal. Shows step-by-step positional calculation for learning purposes.
Color Converter — Convert colors between Hex, RGB, and HSL formats. Enter any color format and see all equivalents with a live preview swatch.
Clothing Size Converter — Convert clothing sizes between US, UK, EU, AU, and JP systems for men and women. Includes tops, bottoms, and dresses.
Energy Converter — Free online energy converter. Convert between joules, calories, kilowatt-hours, BTU, and electron-volts instantly and accurately.
Data Storage Converter — Free online data storage converter. Convert between bytes, KB, MB, GB, TB, and PB in both binary (1024) and decimal (1000) systems.
Flow Rate Converter — Convert flow rates between GPM, LPM, cubic meters per hour, CFM, and liters per second. Uses the exact factor 1 GPM = 3.78541 LPM.
Force Converter — Convert force between Newtons, pound-force, kilogram-force, dynes, and kilo-Newtons. Uses the exact factor 1 N = 0.2248 lbf.
Frequency Converter — Convert frequency between Hz, kHz, MHz, GHz, and THz. Each step scales by 1000. Also shows period in seconds and milliseconds.
Fuel Economy Converter — Convert fuel economy between MPG, L/100km, and km/L instantly. Supports US MPG, UK MPG, and metric fuel economy standards.
Hex to RGB Converter — Convert hexadecimal color codes to RGB values instantly. Supports 3-digit and 6-digit hex with a live color preview swatch.
Hex to Decimal Converter — Convert hexadecimal numbers to decimal and binary. Supports uppercase and lowercase hex digits with step-by-step calculation.
Octal to Decimal Converter — Convert octal (base-8) numbers to decimal, hexadecimal, and binary. Shows step-by-step positional expansion for easy learning.
Paper Size Reference — Look up paper dimensions for A series, B series, US Letter, Legal, and Tabloid. Shows sizes in mm, inches, and points.
Power Converter — Free online power converter. Convert between watts, kilowatts, horsepower, BTU/hr, and foot-pounds per second instantly.
Pressure Converter — Free online pressure converter. Convert between Pascal, bar, psi, atm, mmHg and torr instantly with our easy-to-use tool.
Ring Size Converter — Convert ring sizes between US, UK, EU, and JP systems. Shows inner circumference and diameter in millimeters for accurate sizing.
RGB to Hex Converter — Convert RGB color values to hexadecimal color codes for CSS and HTML. Enter red, green, and blue values to get the hex code.
Screw Size Reference — Look up screw dimensions by designator. Shows major diameter, threads per inch, pitch, and head sizes for common screw types.
Shoe Size Converter — Convert shoe sizes between US, UK, EU, and JP systems for men and women. Includes foot length in cm and inches.
Speed Converter — Convert between mph, km/h, m/s, knots, and more. Free speed unit converter for driving, aviation, science, and athletics with instant results.
Torque Converter — Convert torque between Newton-meters, foot-pounds, inch-pounds, and kilogram-force-meters. Uses the exact factor 1 Nm = 0.7376 ft·lb.
Wire Gauge Converter — Convert AWG wire gauge to diameter in mm and inches, cross-sectional area in mm², and resistance per meter. Covers 0000 to 40 AWG.