Math Calculators

Free calculators for everyday math: percentages, proportions, averages, and more, with each step explained.

17 calculators

• Fraction Calculator

  Add, subtract, multiply, and divide fractions, with the result simplified.

• Percentage Calculator

  Work out a percentage of a number, what percent one number is of another, and more.

• Percentage Change Calculator

  Find the percentage increase or decrease between two values, or apply a percentage.

• Ratio Calculator

  Simplify a ratio or split an amount in a given ratio.

• Rule of Three Calculator

  Solve direct and inverse proportions: if A goes with B, what goes with C?

• Average Calculator

  Find the mean, median, mode, and range of a list of numbers.

• GCF Calculator

  Find the greatest common factor of two or more numbers, with prime factors.

• LCM Calculator

  Find the least common multiple of two or more numbers, with prime factors.

• Standard Deviation Calculator

  Get the sample or population standard deviation, variance, and mean of a list.

• Decimal to Fraction Calculator

  Convert any decimal, including repeating decimals, to a simplified fraction.

• Slope Calculator

  Find the slope, y-intercept, and equation of the line through two points.

• Volume Calculator

  Find the volume of a box, cylinder, sphere, cone, or pyramid, in liters too.

• Pythagorean Theorem Calculator

  Find the hypotenuse or a missing leg of a right triangle.

• Quadratic Formula Calculator

  Solve ax² + bx + c = 0 for real or complex roots, with the discriminant.

• Area of a Circle Calculator

  Find the area of a circle from its radius, diameter, or circumference.

• Scientific Notation Calculator

  Convert numbers to and from scientific, E, and engineering notation.

• Probability Calculator

  Find the chance of two independent events, or of something happening at least once.