Categories · 25 tools
Math Calculators
Ratios, proportions and everyday arithmetic.
Ratio
Simplify a ratio to its lowest terms, or solve a proportion to find a missing value. Enter two numbers to reduce A:B, or add a third to solve A:B = C:?.
CalculatePercentage
Work out percentages three ways: what is X% of a number, what percent one number is of another, and finding the whole from a part and its percentage.
CalculateArea
Calculate the area of a rectangle, square, triangle, circle or trapezoid. Pick the shape and enter its measurements to get the area and the formula used.
CalculateVolume
Calculate the volume of a cube, box, sphere, cylinder, cone or pyramid. Pick the solid and enter its measurements to get the volume and the formula used.
CalculatePythagorean
Find the hypotenuse or a missing leg of a right triangle with the Pythagorean theorem, a² + b² = c². Enter the two known sides.
CalculateSquare Root
Find the square root of any number, plus the cube root and the square. See whether the number is a perfect square.
CalculateExponent
Raise any number to a power. Enter a base and an exponent — including negative and fractional exponents — to get the result.
CalculateScientific Notation
Convert any number to scientific notation, a × 10^b, with the mantissa and exponent shown. Handy for very large or very small numbers.
CalculatePercentage Change
Find the percentage change between two numbers — an increase or a decrease. Enter the old and new values to see the percent change, the absolute change and the direction.
CalculateIncrease / Decrease
Increase or decrease a number by a percentage. Enter a value and a percent to get the new amount and the exact amount added or taken off.
CalculateFractions
Add, subtract, multiply and divide fractions, with the result already simplified and shown as a decimal. Enter the numerators and denominators.
CalculateAverage
Calculate the mean, median, mode and range of a list of numbers, plus the sum and count. Enter your values separated by commas.
CalculateStandard Deviation
Calculate the standard deviation, variance and mean of a list of numbers, in population mode (÷ n) or sample mode (÷ n−1).
CalculatePercent of a Number
Work out what a percentage of a number is, like 15% of 80. Also shows the number plus and minus that percentage, for tips and discounts.
CalculateGeometric Mean
Calculate the geometric mean of a set of positive numbers — the nth root of their product. Useful for growth rates, ratios and returns.
CalculateProbability
Calculate the probability of an event from the favorable and possible outcomes. See the result as a percentage, a decimal and a fraction.
CalculateCombinations
Calculate combinations (nCr) and permutations (nPr). Enter n and r to find how many ways to choose or arrange items — order matters for permutations, not for combinations.
CalculateFactorial
Calculate the factorial of a number (n!) — the product of all whole numbers from 1 to n. Exact results for large values using big-integer math.
CalculatePrime Number
Check whether a number is prime, see its prime factorization if it is not, and find the next prime number.
CalculateLCM & GCF
Find the least common multiple (LCM) and the greatest common factor (GCF/GCD) of two or more whole numbers.
CalculateLinear Equation
Solve a linear equation of the form ax + b = cx + d for x, with the step-by-step work. Handles no-solution and infinite-solution cases.
CalculateQuadratic Equation
Solve quadratic equations ax² + bx + c = 0 with the quadratic formula. Enter the coefficients to see the discriminant and the roots.
CalculateProportion
Solve a proportion a/b = c/d for any missing term by cross multiplication. Enter the three known values and choose which one to solve for.
Calculate