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Pick a calculator. Each one shows the answer as you type, with the worked steps underneath.

Percentage calculatorFind a percent of any number, such as 15% of 200.Open the calculator ›What percent is X of YTurn a part and a whole into a percent, such as 30 out of 200.Open the calculator ›X is Y% of what numberFind the whole when you know a part and its percent.Open the calculator ›Percent change calculatorPercent increase or decrease from an old value to a new value.Open the calculator ›Percent increase calculatorAdd a percent to a number, such as 200 plus 15%.Open the calculator ›Percent decrease calculatorTake a percent off a number, such as 200 minus 15%.Open the calculator ›Percentage difference calculatorCompare two values without choosing which is the base.Open the calculator ›Fraction to percentConvert a fraction such as 3/8 to a percent and a decimal.Open the calculator ›Grade percentage calculatorTurn points earned out of points possible into a percent.Open the calculator ›Discount calculatorSale price and savings from an original price and a percent off.Open the calculator ›Sales tax calculatorAdd sales tax at the rate you enter to any price.Open the calculator ›Tip calculatorTip, total and the amount each person pays.Open the calculator ›Markup and margin calculatorProfit, margin and markup from a cost and a selling price.Open the calculator ›Celsius to FahrenheitConvert °C to °F with the worked formula.Open the calculator ›Fahrenheit to CelsiusConvert °F to °C with the worked formula.Open the calculator ›Temperature converter (°C, °F, K)Convert between Celsius, Fahrenheit and Kelvin in one place.Open the calculator ›

Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.

Written by Calculators Free Editorial Team · Data checked 2026-11-12
About · How we verify this · Editorial policy · Corrections

General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.