Calculator Wizard
The Three Core Percentage Questions
Almost every percentage problem is one of three basic questions. This calculator answers the first — for the other two, use the links below.
| Question | Formula | Tool |
|---|---|---|
| What is X% of Y? | (X ÷ 100) × Y | This calculator |
| X is what percent of Y? | (X ÷ Y) × 100 | What Percent Calculator |
| What percent change from X to Y? | ((Y − X) ÷ X) × 100 | Percent Change Calculator |
Quick Reference: Common Percentages
For round numbers people frequently look up, here's a quick-glance table:
| % | of 50 | of 100 | of 200 | of 500 | of 1000 |
|---|---|---|---|---|---|
| 10% | 5 | 10 | 20 | 50 | 100 |
| 25% | 12.5 | 25 | 50 | 125 | 250 |
| 50% | 25 | 50 | 100 | 250 | 500 |
| 75% | 37.5 | 75 | 150 | 375 | 750 |
What Is X% of Y?
This is the most fundamental percentage calculation — finding what a given percentage of a number actually equals. It's the building block behind discounts, tips, grades, statistics, and almost every other percentage calculation on this site. Percentages over 100% are completely valid too — for example, "150% of 40" simply means one and a half times 40, which equals 60. This comes up often in growth calculations, where a value more than doubles.
Example 1: What is 15% of 60?
Step 1: Convert 15% to decimal → 15 ÷ 100 = 0.15
Step 2: Multiply → 0.15 × 60 = 9
Example 2: What is 8% of 250?
Step 1: 8 ÷ 100 = 0.08
Step 2: 0.08 × 250 = 20
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