Percentage Calculator
Five percentage modes in one tool — find X% of Y, calculate percentage change, or add and subtract a percentage. All results update instantly.
What is X% of Y?
Result
50
25% of 200 = 50
Five percentage calculation modes
What is X% of Y?
X% of Y = ?
X is what percent of Y?
X is ?% of Y
Percentage change from A to B
Change from X to Y = ?%
Add X% to a number
Y + X% = ?
Subtract X% from a number
Y − X% = ?
Percentage formulas
All percentage calculations follow standard arithmetic formulas:
result = Y × (X ÷ 100)result = (X ÷ Y) × 100result = ((B − A) ÷ |A|) × 100result = Y × (1 + X ÷ 100)result = Y × (1 − X ÷ 100)Privacy — runs in your browser
All calculations happen locally in your browser. No data is uploaded. No signup required.
Frequently Asked Questions
What is 15% of 200?
15% of 200 = 200 × 0.15 = 30. Use the "X% of Y" mode and enter 15 and 200.
How do I calculate a percentage increase?
Use the "% Change" mode. Enter the original value as A and the new value as B. A positive result is a percentage increase; a negative result is a decrease.
What is 25 as a percentage of 80?
(25 ÷ 80) × 100 = 31.25%. Use the "X is % of Y" mode and enter 25 and 80.
How do I add 20% to a price?
Use the "Add %" mode: enter 20 as the percentage and your price as the base value. The result is the price including the 20% addition.