Numbers & units FREE CALCULATOR
Percentage calculator
Find a percentage, compare two amounts or calculate percentage change.
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Enter your numbers and select Calculate to see the breakdown.
A share cannot use a zero denominator. Percentage change requires a positive starting value so increases and decreases remain meaningful.
How it works
A% of B = A ÷ 100 × B. A as a percentage of B = A ÷ B × 100. Percentage change = (B − A) ÷ A × 100, using a positive starting value.
A quick example
20% of 150 is 30. An increase from 80 to 100 is 25%.
Good to know
What is a percentage point?
A change from 10% to 15% is 5 percentage points, but a 50% relative increase.
Can I use negative numbers?
Yes for percentage-of and share calculations. The change mode requires a positive starting value.