Miscellaneous math tools and specialty calculators. Browse our free other tools below — all calculators are instant, accurate, and require no sign-up.
Arc Length Calculator — Calculate arc length, sector area, chord length, and arc-to-chord ratio from radius and central angle. Includes preset common angles, a properties table, and an arc diagram.
Average Rate of Change Calculator — Calculate the average rate of change (f(b)−f(a))/(b−a) for common functions. Includes secant line slope, comparison with instantaneous rate, interval table, and visual diagram.
Associative Property Calculator — Demonstrate and verify the associative property for addition and multiplication. See counterexamples for subtraction and division with custom numbers, presets, and grouping visuals.
Central Angle Calculator — Calculate the central angle from arc length and radius. Find inscribed angle relationships, sector area, and segment properties with presets, properties table, and circle visual.
Box Method Multiplication Calculator — Multiply polynomials using the box/area model method. Displays a visual grid, collects like terms, shows the expanded and simplified result with presets and step-by-step breakdown.
Clock Angle Calculator — Calculate the angle between the hour and minute hands of an analog clock. Shows reflex angle, hand positions, and a clock face visual with a full-day angles table.
Change of Base Calculator — Apply the logarithm change of base formula to convert between any bases. Compare natural, common, and binary logarithms with a conversion table and visual comparison.
Coin Rotation Paradox Calculator — Explore the coin rotation paradox: how many times does a coin rotate when rolling around another? Handles inner/outer rolling, different radii, path length, and demonstrates the paradox with visuals.
Column Space Calculator — Find the column space of a matrix including basis vectors, rank, nullity, and RREF steps. Supports matrices up to 6×6 with presets and step-by-step row reduction.
Common Multiple Calculator — Find the LCM, GCD, and first N common multiples of two or more numbers. Includes prime factorization table, multiples overlap visualization, and preset number sets.
Compatible Numbers Calculator — Find compatible number pairs for mental math estimation. Compare rounding strategies, see error percentages, and discover the most accurate estimation approach for any arithmetic operation.
Condition Number Calculator — Compute the matrix condition number κ(A) in 1-norm, ∞-norm, and Frobenius norm. Checks if a matrix is well or ill-conditioned with sensitivity visualization.
Conjugate Calculator — Find the complex conjugate or radical conjugate of a number. Computes modulus, argument, product z·z̄, rationalization, and displays an Argand diagram.
Decagon Calculator — Calculate all properties of a regular decagon: perimeter, area, apothem, circumradius, interior angles, diagonals. Input by side, radius, apothem, area, or perimeter.
Cycloid Calculator — Calculate cycloid curve properties: arc length, area under arch, cusps, parametric points, surface of revolution. Includes interactive curve plot and properties table.
Diamond Problem Calculator — Solve diamond factoring puzzles: find two numbers given their product and sum, or reverse. Visual diamond shape, presets for common problems, solutions table, and step-by-step factoring breakdown.
Diameter to Radius Calculator — Convert between diameter, radius, circumference, and area of a circle. Batch mode for multiple values, circle diagram, and complete conversion table.
Digital Root Calculator — Compute the digital root (repeated digit sum) of any number. Shows iteration steps, divisibility-by-9 connection, multiplicative digital root, additive persistence, and digit frequency analysis.
Distributive Property Calculator — Demonstrate and verify the distributive property a(b+c) = ab + ac with numbers. Expand expressions, see step-by-step verification, area model visual, and comparison table for multiple examples.
Doubling Time Calculator — Calculate doubling time from a growth rate using the Rule of 72, exact formula, and continuous compounding. Also tripling time, comparison table across rates, and exponential growth curve visual.
Endpoint Calculator — Find a missing endpoint given a midpoint and the other endpoint in 2D or 3D. Distance verification, calculation steps, presets for common problems, coordinate visualization, and formulas.
Elimination Method Calculator — Solve 2×2 and 3×3 systems of linear equations by elimination. Step-by-step multiply-and-add operations, presets for common systems, elimination steps table, and solution coordinate visual.
Engineering Notation Calculator — Convert numbers to engineering notation (exponents that are multiples of 3), SI prefix lookup, comparison with scientific notation, magnitude scale visual, presets for common values.