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Free online miscellaneous math calculators. Fast, accurate, and always free to use.
Use our free age calculator to compute exact age from any birth date to any as-of date. Shows years, months, days, total days, hours, minutes, seconds, days until next birthday, and the day of the week you were born.
Use our free time calculator to perform time arithmetic: add or subtract hours/minutes/seconds, calculate the difference between two clock times (HH:MM or HH:MM:SS), and convert between time units (seconds, minutes, hours, days, weeks).
Use our free date difference calculator to find the exact duration between any two dates. Shows years/months/days, total days, weeks+d days, total hours, minutes, seconds, and approximate weekday/weekend counts.
Use our free day calculator to get comprehensive date information: day of week, day of year (1-365/366), week number, days remaining in the year, leap year status, quarter, and whether the date is today.
Use our free unit rate calculator to compute the rate per unit for any quantity (e.g., price per item, speed, density, efficiency). Also compare two options side by side to find the better buy with savings per 100 units.
Use our free rule of three calculator to solve direct proportions. Given three known values A, B, C in the proportion A : B = C : X, find the unknown X with a clear step-by-step breakdown.
Use our free ratio simplifier to reduce any ratio (A : B) to its lowest terms by dividing both parts by their greatest common factor. Shows equivalent ratios (2x-10x), decimal form, fraction form, and percentage.
Use our free scale factor calculator to find the scale factor between original and scaled values (enlargement or reduction), find the scaled dimension given original and factor, or find the original given scaled and factor. Shows percentage change and reciprocal factor.
Use our free golden ratio calculator to explore the golden ratio (φ ≈ 1.618). Compute φ with its properties (φ², 1/φ, φ−1), find the shorter or longer segment in golden proportion, check if any ratio matches φ, and verify the golden ratio relationship.
Use our free BMI formula calculator (math version) to compute Body Mass Index from weight and height with a comprehensive mathematical breakdown: the formula, step-by-step calculation, BMI category (WHO standard), healthy weight range, Ponderal Index, and weight needed for normal BMI.
Use our free speed calculator to solve speed, distance, or time problems. Given any two values, the calculator finds the third using the formula Speed = Distance ÷ Time. Also converts to km/h and mph.
Use our free density calculator to solve density, mass, or volume problems. Given any two values, the calculator finds the third using D = M / V. Shows specific gravity relative to water (1000 kg/m³).
Use our free distance formula calculator to compute the Euclidean distance between two points in 2D or 3D space. Shows step-by-step: coordinate differences, squares, sum, square root, midpoint, and slope (2D).
Use our free work rate calculator to solve combined work problems. Given two workers' individual times, find how long they take together (1/a + 1/b = 1/t). Or given one worker's time and the combined time, find the other's time. Shows each worker's contribution percentage.
Use our free percentage error calculator to compute percentage error (|approx − exact| / |exact| × 100%) and percentage difference between two values. Shows absolute error, relative error, accuracy, direction (overestimated/underestimated), and percentage change.
Use our free weighted GPA calculator to compute your GPA from course grades and credit hours. Supports up to 10 courses with individual grade points and credits. Shows total grade points, total credits, GPA, letter grade, and per-course breakdown.
Use our free scientific calculator for advanced mathematical operations: trigonometric functions (sin, cos, tan, and inverses) with degree/radian mode, logarithms (log₁₀, ln), roots (sqrt, cbrt), powers, factorial, reciprocal, absolute value, constants (π, e), and angle conversion.
Use our free graphing calculator to evaluate any function f(x) over a range of x values. Enter an expression in terms of x, set the range and step, and get a table of (x, y) points, the maximum and minimum y values, zeros/roots (where f(x)=0), the slope between endpoints, and f(0).
Use our free expression evaluator to evaluate any mathematical expression. Supports variables x, y, z, constants (π), functions (sin, cos, tan, asin, acos, atan, sqrt, ln, log10, exp, abs, ceil, floor), and operators (+, −, ×, ÷, ^). Shows the original expression, substituted values, and result.
Use our free formula solver to solve common formulas for any unknown variable. Choose from distance-rate-time, Ohm's law (V=IR), Newton's second law (F=ma), simple interest (I=Prt), kinetic energy (KE=½mv²), and electrical power (P=VI). Enter known values and select which variable to solve for.
Addition, subtraction, multiplication, and division calculators.
Simplify, compare, and calculate with fractions.
Decimal conversion, rounding, and arithmetic calculators.
Calculate powers, square roots, and nth roots.
Solve equations, inequalities, and algebraic expressions.
Area, volume, perimeter, and shape calculators.
Sine, cosine, tangent, and trigonometric functions.
Mean, median, mode, standard deviation, and more.
Prime numbers, factorization, factors, multiples, and LCM calculators.
Binary, decimal, and hexadecimal converters and arithmetic.
Arithmetic and geometric sequences and series.
Matrix operations, determinants, and inverses.
Derivatives, integrals, and limits calculators.
Complex number arithmetic and conversions.
Vector operations, eigenvalues, and linear systems.
Round numbers to specified precision and significant figures.