Percentage Calculator
Free online percentage calculator. Calculate percentages, percentage change, percentage of a number, and reverse percentage.
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Frequently Asked Questions
How do I calculate X% of Y?
Multiply X by Y and divide by 100. For example, 15% of 1000 = 1000 × 15 ÷ 100 = 150. Our percentage calculator handles this automatically.
How do I calculate percentage change?
Percentage change = (New Value - Old Value) ÷ Old Value × 100. An increase from 100 to 150 is a 50% increase.
What is reverse percentage?
Reverse percentage finds the original value before a percentage was applied. If an item costs $85 after a 15% discount, the original price was $100.