Percentage Calculator
Three calculators in one: percent of a number, percentage change, and ratio.
3 Modes
Real-time
Easy to Use
What is X% of Y?
% of
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Percentage Change
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X is What % of Y?
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Features
3 Calculation Modes
Percent of, percentage change, and ratio — all in one page.
Instant Results
Results update as you type. No button to click, no waiting.
Increase & Decrease
See if the change is an increase or decrease, color-coded for clarity.
Smart Formatting
Results are formatted with up to 6 decimal places and locale-aware number separators.
Pro Tips
- ●Tip: 25% of 200 is the same as 200 × 0.25. The calculator handles this for you.
- ●Percentage change formula: ((New - Old) / |Old|) × 100. Works for both increases and decreases.
- ●To find what percentage X is of Y: (X / Y) × 100. For example, 25 is 12.5% of 200.