Percentage Calculators
Calculate percentages, percentage increases and decreases, percent change, reverse percentages and more. Choose a calculator below and enter your numbers for an instant answer.
- Tip CalculatorWork out the gratuity and split the bill between friends.Bill × Tip %
- Decrease by PercentageReduce any number by a percentage and see the amount removed.X × (1 − Y ÷ 100)
- Increase by PercentageAdd a percentage on top of a starting amount.X × (1 + Y ÷ 100)
- Mixed Fraction to PercentConvert a mixed fraction into a decimal and a percentage.(A × C + B) ÷ C × 100
- What Percent Is X of YFind what percentage one value is of another.X ÷ Y × 100
- What Is X% of YFind a percentage of a known number.X × Y ÷ 100
- Reverse Percentage — X Is Y% of WhatFind the original whole when you know the part and percentage.X ÷ (Y ÷ 100)
- Percent ChangeFind the percentage increase or decrease between two values.(Y − X) ÷ X × 100
Common Percentage Calculations
Almost every percentage question is one of six shapes. Once you know which one you are asking, the formula follows.
- What percentage one value is of another — a share or score out of a total: What Percent Is X of Y.
- A percentage of a known number — tax, a commission or a portion of a budget: What Is X% of Y.
- The original whole — you know the part and what percentage it represents: Reverse Percentage Calculator.
- Percentage change — comparing an old value with a new one: Percent Change Calculator.
- Increasing a number — a raise, a markup or adding tax: Increase by Percentage.
- Decreasing a number — a sale price or a budget cut: Decrease by Percentage.
Working with fractions instead? The Mixed Fraction to Percent Calculator converts a mixed number into a decimal and a percentage first, so you can feed it into any of the tools above.