Arithmetic, algebra, geometry, number theory and statistics calculators that show their working — solve the problem and see the steps. 44 tools, grouped by topic.
Arithmetic & everyday math
Percentages, fractions, ratios, rounding, averages and long division.
- Basic CalculatorFree online basic calculator with a button keypad: add, subtract, multiply, divide, percent, sign toggle,…
- Scientific CalculatorFree online scientific calculator with trigonometry, logarithms, powers, roots, factorials and constants…
- Percentage CalculatorFree percentage calculator.
- Percent Error CalculatorCalculate percent error from an observed (measured) value and a true (accepted) value.
- Fraction CalculatorAdd, subtract, multiply or divide two fractions.
- Ratio CalculatorSimplify a ratio A:B to lowest terms using the GCD, or solve a proportion A:B = C:x for the missing value.
- Rounding CalculatorRound any number to a set number of decimal places or to the nearest 10/100/1000, using half-up,…
- Average CalculatorFind the mean (average) of a list of numbers, plus sum, count, and median.
- Long Division CalculatorDivide two integers to get the quotient, remainder, and decimal, with full step-by-step long-division…
- Big Number CalculatorAdd, subtract, multiply, raise to a power, or take the modulo of two arbitrarily large integers with exact…
- Scientific Notation CalculatorConvert any number to scientific notation (a x 10^b) and E-notation, or convert scientific notation back…
Algebra & functions
Quadratics, exponents, logarithms, roots, slopes, sequences and matrices.
- Quadratic Formula CalculatorSolve ax^2+bx+c=0 with the quadratic formula.
- Exponent CalculatorRaise any base to a power.
- Logarithm CalculatorCompute log base b of x with any base.
- Square Root Calculator (nth Root)Square root calculator that also finds cube roots and any nth root, including real roots of negative…
- Slope CalculatorFind the slope, y-intercept, line equation, distance and angle from two points (x1,y1) and (x2,y2).
- Number Sequence CalculatorGenerate an arithmetic, geometric, or Fibonacci sequence from a first term, step value, and term count.
- Matrix CalculatorAdd, subtract, or multiply two 2x2/3x3 matrices, or get the determinant and transpose of one.
- Half-Life CalculatorCompute the remaining quantity of a decaying substance from initial amount, half-life, and elapsed time.
Geometry
Area, surface area, volume, circles, triangles and distance between points.
- Area CalculatorCalculate the area of a rectangle, triangle, circle, trapezoid, parallelogram, or ellipse.
- Surface Area CalculatorCalculate the surface area of a cube, box, sphere, cylinder, or cone.
- Volume CalculatorCalculate the volume of a cube, rectangular box, sphere, cylinder, cone, or pyramid.
- Circle Calculator: Area & CircumferenceArea of a circle, circumference, radius or diameter — enter any one and get the other three instantly,…
- Triangle CalculatorSolve a triangle from its three sides (SSS).
- Right Triangle CalculatorSolve a right triangle from two known values: two legs, a leg and hypotenuse, or a leg and an acute angle.
- Pythagorean Theorem CalculatorSolve a right triangle with a²+b²=c².
- Distance CalculatorCompute the Euclidean (straight-line) distance and midpoint between two points in 2D or 3D space.
Number theory & bases
Factors, GCF, LCM, primes, and hex/binary arithmetic.
- Factor CalculatorList all positive factors (divisors) of an integer, count them, sum them, and check whether the number is…
- Common Factor CalculatorFind all common factors of two or more integers and highlight the greatest common factor (GCF).
- GCF CalculatorFind the greatest common factor (GCD) of a list of integers using the Euclidean algorithm.
- LCM CalculatorFind the least common multiple (LCM) of a list of integers.
- Prime Factorization CalculatorFactor any integer into its prime factors with exponents (e.g.
- Hex CalculatorAdd, subtract, multiply, divide and bitwise two hexadecimal numbers, with live conversion to decimal and…
- Binary Calculator & ConverterBinary calculator and converter: add, subtract, multiply and divide binary numbers, and convert between…
Statistics & probability
Descriptive stats, standard deviation, z-scores, p-values, confidence intervals, sample size and combinatorics.
- Statistics CalculatorEnter a list of numbers to get count, sum, mean, median, mode, range, min, max, variance, population and…
- Mean, Median, Mode, Range CalculatorEnter a list of numbers to instantly compute the mean (average), median, mode(s) and range.
- Standard Deviation CalculatorPaste a list of numbers to get mean, population and sample standard deviation, variance, and count.
- Z-Score CalculatorCompute a z-score from a value, mean, and standard deviation, plus its percentile using the normal…
- P-Value CalculatorConvert a z-score to a p-value for one-tailed or two-tailed tests using the standard normal CDF.
- Confidence Interval CalculatorCompute the confidence interval for a sample mean from sample mean, standard deviation, size, and…
- Sample Size CalculatorFind the survey sample size you need from confidence level, margin of error, population size and response…
- Probability CalculatorCompute P(A and B), P(A or B), and complements for independent events, plus single-event probability from…
- Permutation and Combination CalculatorCompute nPr and nCr from n and r using the standard factorial formulas, with overflow-safe iterative math…
- Random Number GeneratorGenerate random numbers between a min and max.