Percentage change
Find how much a positive starting value increased or decreased. Use the same measurement unit for both entries.
Math and geometry calculators
Choose by the problem's structure: fraction arithmetic, integer cycles, selection counts, statistics and geometry each require different inputs.
Which tool fits this question?
GCD and LCM use positive integers. Permutations and combinations use distinct objects without replacement. Find an ordinary mean and spread on the standard deviation page, or use weighted mean when entries have different weights. Choose by the actual operation rather than a different name for the same calculation.
- How can I calculate fractions and reduce the result to lowest terms?
- How do I average results with different credits or assessment weights?
- What is the difference between selecting people and arranging them in order?
Use consistent length units for geometry; areas use squared units. Inverse trigonometric functions return principal values only. Each tool states its numeric and definition limits.
Math and geometry · 16 tools
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Fractions and decimal conversion
Add, subtract, multiply or divide two fractions, or convert finite decimals and mixed numbers. Choose a mode before entering its values.
Prime factorization calculator
Break one positive whole number into prime factors, see repeated factors as powers, and follow every exact division step.
Two linear equations
Solve equations arranged as a*x + b*y = c and d*x + e*y = f. Enter the six numbers, including minus signs, rather than pasting whole equations.
Arithmetic and geometric sequences
Find a final term and sum for an arithmetic or geometric sequence. Choose whether you repeatedly add a difference or multiply by a ratio.
Weighted average, GPA and target score
Average values using their weights, or calculate stock purchase cost, a school-defined GPA or a remaining exam target. Choose the mode before preparing each line.
Combinations and permutations
Count selections when order does or does not matter. Objects must be distinct and cannot be selected more than once.
Standard deviation and variance
Describe how spread out a list of numbers is around its mean. Both sample and population statistics are shown.
Greatest common divisor and least common multiple
Find the largest integer dividing both numbers and the smallest positive multiple shared by them. These answer different grouping and cycle questions.
Pythagorean theorem
Find a missing side in a right triangle. Choose whether the missing side is the longest hypotenuse or one of the two perpendicular legs.
Trigonometric functions
Calculate sine, cosine and tangent or recover a principal angle from a function value. Check degrees versus radians before calculating.
Quadratic equation
Solve a quadratic arranged as a*x^2 + b*x + c = 0. Move all terms to the left before entering the coefficients.
Powers and roots
Raise a number to a power or find its nth root. Select the operation before entering the exponent or root degree.
Logarithm
Find the exponent needed to raise a base to a positive number. This is different from dividing the number by the base.
Common shape areas
Calculate triangle, rectangle or circle area from the dimensions for that shape. Keep all lengths in the same unit.
Common solid volumes
Calculate the volume of a rectangular box, cylinder or sphere. Enter the dimensions shown for the chosen solid.