Math calculators

Everyday arithmetic and school maths. Start with percentages, the calculation people get wrong most often, from discounts and marks to growth figures and price rises.

Ready to use

Percentage Calculator

X% of Y, X as a % of Y, and percentage increase or decrease.

Each page explains the formula with a worked example, so the tools are as useful for learning the method as for getting a quick answer.

Coming soon

Arithmetic

  • Percentage Change Calculator
  • Ratio Calculator
  • Proportion Calculator
  • Fraction Calculator
  • Decimal to Fraction Calculator
  • Fraction to Decimal Calculator
  • GCD Calculator
  • LCM Calculator
  • Prime Number Checker
  • Prime Factorization Calculator
  • Exponent Calculator
  • Square Root Calculator
  • Cube Root Calculator
  • Logarithm Calculator
  • Scientific Notation Calculator
  • Absolute Value Calculator
  • Modulo Calculator
  • Average Calculator
  • Weighted Average Calculator
  • Random Number Generator
  • Scientific Calculator

Algebra and geometry

  • Linear Equation Calculator
  • Quadratic Equation Calculator
  • Discriminant Calculator
  • Slope Calculator
  • Distance Calculator
  • Midpoint Calculator
  • Pythagorean Theorem Calculator
  • Triangle Area Calculator
  • Heron's Formula Calculator
  • Triangle Angle Calculator
  • Equilateral Triangle Calculator
  • Rectangle Calculator
  • Square Calculator
  • Circle Calculator
  • Sector Calculator
  • Ellipse Calculator
  • Trapezoid Calculator
  • Polygon Calculator
  • Sphere Calculator
  • Cylinder Calculator
  • Cone Calculator
  • Prism Calculator
  • 3D Distance Calculator
  • Trigonometry Calculator
  • Unit Circle Calculator

Questions

Do these explain the method?

Yes. Every maths calculator page shows the formula and a worked example.

Can I enter negative numbers and decimals?

Yes, wherever they make sense. Where they do not, for example a percentage change from zero, the calculator explains why.