Percentage Calculator
Work out percentages, percentage change, increases and decreases, and what percent one number is of another.
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How to use the Percentage Calculator
- Choose the type of percentage question.
- Enter the two numbers.
- Read the answer together with the formula used.
Formulas
- X% of Y = Y × X ÷ 100
- X is what % of Y = X ÷ Y × 100
- Percentage change from X to Y = (Y − X) ÷ |X| × 100
- Increase X by Y% = X × (1 + Y ÷ 100); decrease = X × (1 − Y ÷ 100)
- Percentage difference = |X − Y| ÷ ((X + Y) ÷ 2) × 100
Frequently asked questions
What is the difference between percentage change and percentage difference?
Percentage change compares a new value with an original value and has a direction. Percentage difference compares two values symmetrically, using their average as the base.
Why is a 50% drop followed by a 50% rise not back to the start?
The rise is calculated on the smaller value. 100 → 50 → 75.