Math Calculators

Percentage calculator: find X% of any number, or what percent one number is of another.

Percent change calculator: percentage increase or decrease between an old value and a new value.

Fraction calculator: add, subtract, multiply or divide two fractions and get the answer in lowest terms.

Average calculator: the mean, sum, minimum and maximum of up to five numbers.

Ten key calculator: an online adding machine with a printed tape, running total and item count. Type straight from your number pad.

Quadratic equation calculator: solve ax² + bx + c = 0 for real or complex roots, with the discriminant.

Double integral calculator: numerically evaluate ∫∫ f(x,y) dx dy over a rectangular region using Simpson's rule for a fast volume estimate.

Net ionic equation calculator: pick a common aqueous reaction and see the full molecular equation, spectator ions and net ionic equation.

Combined gas law calculator: solve for the final pressure, volume or temperature using P1V1/T1 = P2V2/T2.

Moment of inertia calculator: find I for a cylinder, sphere, rod or point mass from its mass and radius or length.

Center of mass calculator: find the balance point of up to three masses from their weights and x, y positions.

AP Chem score calculator: estimate your AP Chemistry 1-5 score from multiple-choice and free-response points.

AP Physics 2 score calculator: estimate your 1-5 score from multiple-choice and free-response points.

LCM calculator: find the least common multiple of two or three numbers, plus their greatest common factor, for fractions and homework.

GCF calculator: find the greatest common factor (GCD) of two or three numbers and see their LCM, with the steps explained simply.

Pythagorean theorem calculator: find the hypotenuse or a missing leg of a right triangle, plus its area and perimeter, step by step.

Standard deviation calculator: enter up to five values to get sample or population standard deviation, variance and the mean.

Percent error calculator: compare a measured value with the true value to get percent error and absolute error for labs.

Percent difference calculator: compare two numbers against their average to see how far apart they are as a percentage, with the formula.

Square root calculator: get the square root, cube root and square of any number, and check whether it is a perfect square, free and fast.

Circumference calculator: find the circumference, diameter and area of a circle from its radius or its diameter, with the formulas shown.

Scientific notation calculator: convert any number to scientific, E and engineering notation with its exponent.

Median calculator: find the middle value, plus the range and quartiles, of up to six numbers.

Proportion calculator: solve a/b = c/x for the missing value and see the cross-multiplication step.

Midpoint calculator: find the point halfway between two coordinates and the distance between them.

Log calculator: find the logarithm of a number for any base, plus the common log and natural log.

Final exam grade calculator: find the score you need on the final to reach the course grade you want.

GPA calculator: enter up to six courses with letter grades and credits to get your semester GPA and optional cumulative GPA.