All Calculators

Calculate x% of any value instantly.

Find increase or decrease percentage between two values.

Solve proportions quickly: if a relates to b, find x for c.

Compute the arithmetic mean for four numbers.

Find the greatest common divisor (GCD / GCF) of two integers.

Find the least common multiple (LCM) of two integers.

Reduce fractions to simplest form and view decimal value.

Simplify or scale ratios.

Convert a fraction to decimal form.

Convert a decimal to a simplified fraction.

Convert decimal to percentage and vice versa.

Compute area and perimeter of a rectangle.

Find triangle area from base and height.

Compute area and circumference of a circle from radius.

Calculate trapezoid area using both bases and height.

Find cube volume from side length.

Calculate cylinder volume from radius and height.

Calculate the volume of a sphere from its radius.

Calculate the volume of a cone from radius and height.

Calculate volume of a rectangular prism (box).

Calculate the surface area of a rectangular prism.

Calculate the surface area of a sphere.

Calculate the surface area of a cube.

Calculate the total surface area of a cylinder.

Solve quadratic equations ax² + bx + c = 0.

Calculate distance between two points in 2D space.

Calculate the slope between two points.

Calculate powers and exponents.

Calculate square root, cube root, or nth root.

Calculate your Body Mass Index (BMI).

Estimate calories burned during exercise.

Calculate age from birth date.

Estimate body fat percentage using Navy circumference method.

Calculate ideal weight ranges using multiple formulas (Robinson, Miller, Devine, Hamwi).

Calculate daily water intake recommendation based on weight and activity level.

Calculate running pace, time, or distance from any two values.

Calculate training heart rate zones based on age and resting heart rate.

Calculate simple interest on a principal amount.

Calculate compound interest with compounding frequency.

Calculate Return on Investment percentage from initial cost and final value.

Calculate the discounted price.

Calculate tip and total for a bill.

Add or remove sales tax from a price.

Calculate the number of days between two dates.

Add or subtract days from a date.

Scale recipe ingredients up or down proportionally.

Calculate how much paint you need for walls and ceilings.

Calculate flooring material needed including waste allowance.

Convert between data storage units (B, KB, MB, GB, TB, PB).

Calculate how long a file download will take at a given speed.