Topic

Percentages and Math

These tools cover the everyday math that comes up in school, work and shopping: percentages, percent change, averages, fractions and ratios.

Every answer shows the formula with your numbers filled in, which makes these useful for checking homework as well as getting a quick answer.

16 calculators in this topic

Percentage CalculatorFind a percent of a number, what percent one number is of another, or the whole from a part.Percent Change CalculatorCalculate the percent increase or decrease between two numbers, or the percent difference.Average CalculatorPaste a list of numbers for the mean, median, mode and range, or switch to a weighted average.Fraction to Decimal ConverterConvert fractions to decimals and decimals to fractions, with inch rounding and a chart.Ratio and Proportion CalculatorSolve proportions, simplify ratios and split a total by a ratio.GPA CalculatorEnter your courses, letter grades and credit hours to get a semester and cumulative GPA with the quality points shown.Fraction CalculatorAdd, subtract, multiply and divide fractions or mixed numbers with exact answers and the steps behind them.Scientific CalculatorType an expression or use the keypad. Trig, logs, roots, factorials, memory and a history of recent calculations.Standard Deviation CalculatorPaste a list of numbers for sample and population standard deviation, variance, mean and standard error.Grade CalculatorCalculate a weighted course grade, or the final exam score you need to reach the grade you want.Rounding CalculatorRound to decimal places, to the nearest ten or hundred, or to significant figures, and compare every rounding mode.Quadratic Equation SolverEnter a, b and c to get the roots, discriminant, vertex and factored form with the steps shown.Pythagorean Theorem CalculatorEnter two sides of a right triangle to find the third, along with area, perimeter and angles.GCF and LCM CalculatorEnter up to eight whole numbers for the GCF, LCM, prime factorizations and Euclid steps.Area CalculatorPick a shape and a unit to get its area, perimeter and the area in square feet, square meters and acres.Combinations and Permutations CalculatorEnter n and r for combinations and permutations, with or without repetition, as exact integers.