Math and study

42 primary tools

Calculations, geometry, statistics and university study tools. Choose a tool and read its instructions, examples and limits before you begin.

Search for a tool

General calculations

Scientific notation converter

Convert decimal numbers and exponential notation in either direction while preserving the digits you enter.

Percent error calculator

Compare a measured value with a reference. Calculate signed difference, absolute error, relative error and percentage error.

Online calculator

Calculate with percentages, decimals and parentheses.

Scientific calculator

Calculate powers, roots, logarithms and trigonometric functions.

Fraction calculator

Add, subtract, multiply and divide fractions with an exact simplified result.

Proportions and rule of three

Solve direct and inverse proportions using the rule of three.

Square root

Calculate the square root of a non-negative number, including decimals. Enter the radicand and get the result with a formula and example.

Prime factorization

Find the prime factorization of an integer from 2 to 1 trillion. See the product of prime factors with their exponents and copy the result.

Equation solver

Solve linear and quadratic equations by entering coefficients a, b and c. Find real or complex roots and identify equations with no or infinitely many solutions.

Least common multiple

Calculate the least common multiple of two or more non-negative integers. Separate numbers with spaces or semicolons and get an exact integer result.

Greatest common divisor

Find the greatest common factor or divisor of two or more non-negative integers. Enter your number list and calculate an exact result, without an account.

Percentage calculator with formulas and steps

Calculate a percentage of a number, find the percentage between two values, or work out an increase or decrease with clear formulas and steps.

Discount calculator

Calculate sale price, savings and stacked discounts. Find the discount percentage from two prices or work back to the original price.

Long division calculator with steps and remainders

Solve long division with remainders and decimal places. Follow every subtraction, check the quotient and copy the working, including decimal inputs.

Degrees and radians

Convert degrees to radians or radians to degrees. Choose the starting unit, enter an angle and check the result with the conversion formula.

Geometry

Slope calculator: rise, run and angle

Calculate slope from two points or rise and run. Convert between percent grade and degrees and explore the triangle with intermediate calculations.

Circle area

Calculate the area of a circle from its radius using A = πr². Enter a measurement, see the result in square units and check a worked example.

Circle circumference

Find a circle’s circumference from its radius. The calculator applies C = 2πr and shows the result with a formula and example, without an account.

Triangle area

Calculate triangle area from the base and perpendicular height using A = b × h ÷ 2. Use matching measurement units and get the area in square units.

Trapezoid area

Calculate trapezoid area from two parallel bases and perpendicular height. Apply A = (B + b) × h ÷ 2 and compare the result with a worked example.

Rectangle area

Find rectangle area by multiplying length and width. Enter both measurements in the same unit, see the result and check the formula and example.

Rhombus area

Calculate rhombus area from its two diagonals using A = D × d ÷ 2. Enter their lengths in matching units and check the result, formula and example.

Parallelogram area

Calculate parallelogram area from its base and perpendicular height. The height is not the sloping side; check the formula and example before entering values.

Sphere volume

Calculate sphere volume from its radius using V = 4πr³ ÷ 3. Get a result in cubic units and see how volume differs from the sphere’s surface area.

Cylinder volume

Calculate cylinder volume from the base radius and height using V = πr²h. Use matching measurement units and check the formula and worked example.

Cone volume

Find cone volume from the base radius and perpendicular height. Apply V = πr²h ÷ 3 and check a worked example with a result in cubic units.

Cube volume

Calculate cube volume by cubing its side length: V = s³. Enter the edge measurement and see the result, formula and example in cubic units.

Cuboid volume

Calculate the volume of a rectangular prism or cuboid from length, width and height. Use matching units for the three edges and check a worked example.

Pyramid volume

Calculate pyramid volume from the base area and perpendicular height. Apply V = A × h ÷ 3 and check an example with square and cubic units.

Triangle perimeter calculator

Calculate a triangle’s perimeter from three sides and check whether the lengths can form a valid triangle.

Regular hexagon area calculator

Calculate the area of a regular hexagon from its side length, with a formula, example and result in square units.

Sphere surface area calculator

Calculate a sphere’s surface area from its radius using 4πr². Includes a worked example and square-unit results.

Regular polygon area calculator

Calculate the area, perimeter and apothem of a regular polygon using its number of sides and side length.