Everyday math & dates
Percentage Calculator
Three common percentage questions, each with its own box. Change any number and the answer updates.
What is X% of Y?
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X is what percent of Y?
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X is Y% of what?
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How it's calculated
A percentage is a number out of 100, so 15% is 0.15. To find 15% of 240, multiply: 0.15 × 240 = 36. To find what percent 36 is of 240, divide and multiply by 100. To find the whole from a part, divide the part by the percentage as a decimal.
Part = % × Whole % = Part ÷ Whole Whole = Part ÷ %
How to do it in Excel
In Excel, a cell formatted as a percentage already holds the decimal, so 15% is stored as 0.15.
=B1*B2- 15% of 240, with 15% in B1 and 240 in B2.
=A1/B1- What percent A1 is of B1. Format the result as a percentage.
=A1/B1- Whole from a part in A1 and a percentage in B1.