Math Calculators

Solve the three everyday percent problems: what is X% of Y, X is what percent of Y, and increase or decrease a number by a percent.

Find the percent increase or decrease between a starting value and an ending value, with the direction and absolute change.

Add, subtract, multiply or divide two fractions and get the answer simplified, as a mixed number and as a decimal.

Convert any fraction to its decimal value and percent equivalent instantly.

Turn any decimal into a simplified fraction (and mixed number), with denominators up to 10,000.

Solve a proportion a : b = c : x for the missing value, with the scale factor shown.

Find the greatest common factor and least common multiple of two whole numbers.

Solve ax² + bx + c = 0 with the quadratic formula — real or complex roots, plus the discriminant.

Find the missing side of a right triangle — hypotenuse or either leg — using a² + b² = c².

Find a triangle’s area from its three side lengths with Heron’s formula — no height needed.

Get a circle’s diameter, circumference and area from its radius in one step.

Calculate the area of a rectangle, triangle, circle, trapezoid or ellipse from its dimensions.

Find the volume (and surface area) of a box, cube, sphere, cylinder or cone.

Find the slope, y-intercept and line equation y = mx + b through two points.

Get the distance between two points and the midpoint halfway between them.

Raise any base to any power, including negative and fractional exponents, with the answer in plain and scientific notation.

Take the square root, cube root or any nth root of a number, with a built-in check of the answer.

Compute the logarithm of any number in any base, with natural log and a power check included.

Convert any number to scientific notation — mantissa, exponent, E notation and the plain-English scale name.

Round any number to a chosen number of decimal places or to the nearest 10, 100 or 1,000.

Paste a list of numbers and get the sample and population standard deviation, variance and mean.

Paste a list of numbers and get the mean, median, mode, range, sum and count at once.

Compute nPr and nCr — how many ways to arrange or choose r items out of n.

Turn favorable and total outcomes into a probability percent, plus the odds for and against.

Compute n! for any whole number up to 170, with digit count and trailing zeros.

Break any whole number up to a billion into its prime factors, with divisor count and a primality check.