Percentage Calculator

Calculate percentages three ways: what percent is X of Y, what is X percent of Y, and the percent change from X to Y. See the formula with every result.

3-in-1 Online Percentage Calculator

1. What is X% of Y?

What is % of ?
Result
37.5
Formula: (15 / 100) × 250 = 37.5

2. X is what percent of Y?

is what % of ?
Result
25%
Formula: (45 / 180) × 100 = 25%

3. Percentage Increase / Decrease from X to Y

From to
Result
+25% (Increase)
Formula: ((150 - 120) / 120) × 100 = +25%
🔒 All calculations compute live in your browser using standard IEEE arithmetic.