Math calculators

Percentages, averages, fractions, equations, ratios and grade calculators that show their working.

Percentage Calculator Find X% of a number, what percent one number is of another, percentage change, percentage difference and percent increase. Average Calculator Paste a list of numbers to get the mean, median, mode, range, sum and standard deviation instantly. Exponent and Root Calculator Raise a number to any power or take any root, including negative and fractional exponents. Final Grade Calculator Find the score you need on your final exam to reach a target grade in the course. Fraction Calculator Add, subtract, multiply and divide fractions, with the answer simplified and shown as a mixed number and decimal. GCF and LCM Calculator Find the greatest common factor and least common multiple of two or more whole numbers. GPA Calculator Calculate your grade point average on the 4.0 scale from letter grades and credit hours. Percent Error Calculator Calculate the percent error between a measured or experimental value and the true or accepted value. Pythagorean Theorem Calculator Find the hypotenuse or a missing leg of a right triangle, plus its area, perimeter and angles. Quadratic Equation Solver Solve ax² + bx + c = 0 for real or complex roots, with the discriminant, vertex and axis of symmetry. Prime Number Checker Check whether a number is prime, see its prime factorization and find the next prime number. Random Number Generator Generate one or many random whole numbers in any range, with options for unique numbers and sorted results. Ratio Calculator Solve proportions of the form A : B = C : D, simplify ratios and scale recipes, maps and images. Scientific Notation Converter Convert numbers to and from scientific notation, E notation and engineering notation, and count significant figures. Percentage Increase Calculator Calculate the percentage increase or decrease from an old value to a new value, with the difference and the formula.

Math tools that show the steps

Each math calculator explains the method alongside the answer, which makes them useful for checking homework as well as for quick sums at work. Percentages, averages and ratios cover most everyday arithmetic; the quadratic, Pythagorean and prime tools handle common school algebra and number theory.

Math guides

How to Calculate Your GPA (Weighted, Unweighted and Cumulative)Grade points, credit hours, weighted honors scales and cumulative GPA explained, with a worked example and tips for raising your average. Mean, Median and Mode: When to Use Each AverageWhy house prices use the median, when the mean misleads, and how standard deviation tells you how much to trust an average. How to Calculate Percentages: 5 Methods With ExamplesPercent of a number, percent change, reverse percentages and the common traps, explained step by step with everyday examples.