Math calculators
Percentages, ratios, and everyday arithmetic.
- Percentage Calculator: X% of Y, What Percent, Percent Change
Find X% of a number, what percent one number is of another, the whole from a part, or the percent change — with the working.
- Simplify Fractions Calculator: Lowest Terms, Mixed Number, Decimal
A fraction in lowest terms with the common factor shown, plus its mixed number, decimal and percentage.
- Percent Change Calculator: Increase or Decrease, With Working
Percent increase or decrease from an old value to a new one, with the working and the change back.
- Mean, Median and Mode Calculator (Average, With Working)
The mean, median, mode and range of a list of numbers, with the sorting and the sums shown.
- Standard Deviation Calculator: Sample and Population, With Working
Sample and population standard deviation and variance of a list of numbers, with every deviation shown.
- Quadratic Formula Calculator: Roots, Discriminant, Vertex (With Steps)
Solve ax² + bx + c = 0 with the quadratic formula, showing the discriminant, the roots, the vertex and the factored form.
- Ratio Calculator (Simplify, Solve a Proportion, Share in a Ratio)
Simplify a ratio, find the missing value in a : b = c : x, or split a total in a given ratio, working shown.
- LCM Calculator (Least Common Multiple, with Steps)
Least common multiple of two or three numbers, three ways: by the GCD, by prime factors and by listing multiples.
- GCD Calculator (Greatest Common Divisor / HCF, with Steps)
Greatest common divisor of two or three numbers, by Euclid's algorithm and by prime factors, working shown.
- Exponent Calculator (Powers, Negative and Fractional Exponents, Solve for x)
Any base to any power with the working, or the exponent that turns a base into a result.
- Square Root Calculator (Simplified Radical, Negative Numbers)
Square root of any number: decimal, simplified radical, and imaginary roots for negatives.
- Rounding Calculator: Decimals, Significant Figures, Nearest 10 or Fraction
Round to decimal places, significant figures, the nearest 10 or 100, or the nearest ½ to 1/64, with a choice of tie rule.
- Prime Factorization Calculator (with Steps)
Prime factors of any whole number up to a trillion, with the division ladder and exponent form.
- Permutations and Combinations Calculator (nPr, nCr, With Working)
nPr and nCr with the factorials written out, plus the counts when repetition is allowed.
- Log Calculator (Any Base, ln, log₁₀, log₂)
Logarithm in base 10, e, 2 or any base you type, with the change-of-base working.
- Matrix Determinant Calculator (2×2, 3×3, 4×4 and up, with Steps)
Determinant of any square matrix up to 8×8, with the working.
- Binary to Decimal Converter (and Decimal to Binary), With Steps
Convert binary to decimal or decimal to binary, with the powers of 2 or the division by 2 shown, plus hex.
- Scientific Notation Calculator (Convert Both Ways, with Steps)
Any number to scientific notation and back, with the decimal-point working, E-notation and engineering notation.
- Slope Calculator
Slope, equation and angle from two points.
- Midpoint Calculator
The point halfway between two endpoints.
- Distance Formula Calculator
Distance between two points, with the exact radical.
- Sig Fig Calculator (Significant Figures)
Count significant figures and round to any number of them.
- Triangle Calculator (SSS & SAS)
Area, angles and missing side of any triangle.
- Decimal to Fraction Calculator
Exact fraction from a decimal, repeating ones included.
- Factor Calculator
Every factor and factor pair of a whole number.
- Matrix Calculator
Multiply, add, invert and transpose matrices.
- Percent Error Calculator
How far a measurement is from the accepted value.