Math Calculators
Percentage Calculator
Use this free percentage calculator to find a percentage of a number, work out what percent one number is of another, or calculate percentage increase and decrease.
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Formula
Part = (Percentage ÷ 100) × Number
Percentage = (Part ÷ Total) × 100
Percentage change = ((New − Old) ÷ Old) × 100
Percentage = (Part ÷ Total) × 100
Percentage change = ((New − Old) ÷ Old) × 100
Worked examples
20% of 500 = 100 because 20 ÷ 100 × 500 = 100.
25 is what percent of 200? = 12.5% because 25 ÷ 200 × 100 = 12.5%.
From 100 to 120 = 20% increase.
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Frequently asked questions
What is a percentage?
A percentage is a number expressed out of 100. For example, 25% means 25 out of 100.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value, then multiply by 100.
Can I use this for discounts and VAT?
Yes, but the dedicated discount and VAT calculators give clearer pricing results.