Percentage Calculator
Find a percent of a number, what percent one value is of another, or percent change between two values.
Find a percentage of a number
Answer
30
Show formula
Formula: result = (percentage ÷ 100) × number
Example: 20% of 150 = (20 ÷ 100) × 150 = 30
Find what percent one number is of another
Answer
25%
Show formula
Formula: percentage = (part ÷ whole) × 100
Example: 30 is what % of 120? = (30 ÷ 120) × 100 = 25%
Find the percent change between two values
Answer
+25%
Show formula
Formula: change = ((new − original) ÷ |original|) × 100
Example: from 80 to 100 = ((100 − 80) ÷ 80) × 100 = +25%
Common Calculations
| Question | Answer |
|---|---|
| What is 15% of 200? | 30 |
| What is 20% of 500? | 100 |
| What is 10% of 1,000? | 100 |
| What is 25% of 400? | 100 |
| What is 30% of 90? | 27 |
| What percentage is 25 of 200? | 12.5% |
| What percentage is 75 of 300? | 25% |
| What percentage is 120 of 400? | 30% |
| Percentage change from 80 to 100? | +25% |
| Percentage change from 200 to 150? | −25% |
Frequently Asked Questions
20% of 150 is 30. Calculated as (20 ÷ 100) × 150 = 30. Use the first calculator above — "What is 20% of 150?" — and enter 20 and 150.
Percent change at scale
The percent-change calculator above works for any two values — including real investments held over many years. A 100× return is a +9,900% percent change. Here's what that looks like.
Invested
Bitcoin · $5,000 in 2013
Value today
$36.5M
% return
+729,223%
7293x multiplier
as of May 15, 2026
Invested
TSLA · $1,000 in 2010
Value today
$336.3K
% return
+33,528%
336x multiplier
as of May 15, 2026
Invested
Ethereum · $1,000 in 2016
Value today
$2.9M
% return
+290,223%
2903x multiplier
as of May 15, 2026
Invested
NVDA · $1,000 in 2015
Value today
$288.1K
% return
+28,706%
288x multiplier
as of May 15, 2026