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Percentage Calculator
Calculate X% of Y, what percent X is of Y, percentage change, increase, or decrease — instantly.
About Percentage Calculations
Percentage calculations are used everywhere — discounts, tips, tax,
statistics, and finance. This calculator handles the five most
common percentage problems.
X% of Y
(X ÷ 100) × Y. Example: 15% of 200 = 30.
What % is X of Y
(X ÷ Y) × 100. Example: 50 is 25% of 200.
% Change
((Y − X) ÷ X) × 100. Example: 100 → 120 = +20%.
Increase / Decrease
Y × (1 ± X/100). Example: 200 increased by 15% = 230.
How to Use This Converter
- Enter the value you want to convert.
- Choose the From unit.
- Choose the To unit.
- Click Convert to see the result instantly.
Frequently Asked Questions
How do I calculate X% of a number?+
Multiply the number by X and divide by 100. Example: 15% of 200 = 200 × 15 ÷ 100 = 30.
How do I calculate percentage change?+
((New value − Old value) ÷ Old value) × 100. Example: 100 → 120 = (20 ÷ 100) × 100 = 20%.
What is the difference between percentage and percentage points?+
Percentage change is relative (10% → 15% is a 50% increase). Percentage points measure absolute difference (10% → 15% is a 5 pp increase).
How do I calculate a discount?+
If an item costs 100 and is 20% off, the final price is 100 × 0.80 = 80.
Is this calculator free?+
Yes — completely free with no registration required.
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