Percentage Calculator – What is X% of Y?

Percentage (%)

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Of number

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Frequently asked questions

How do I calculate a percentage of a number? ›

Multiply the number by the percentage and divide by 100. Example: 25% of 200 = (25 × 200) ÷ 100 = 50. Or simply multiply by the decimal: 0.25 × 200 = 50.

How do I find what percent one number is of another? ›

Divide the part by the whole, then multiply by 100. Example: 50 is what percent of 200? → (50 ÷ 200) × 100 = 25%.

How do I find the original number from a percentage? ›

Divide the part by the percentage, then multiply by 100. Example: 50 is 25% of what number? → (50 ÷ 25) × 100 = 200.

About this percentage calculator

This calculator handles three common percentage problems. Mode 1 finds X% of Y — useful for calculating tips, discounts, and tax amounts. Mode 2 finds what percentage X is of Y — useful for test scores and market share. Mode 3 finds the original number when you know the part and the percentage — useful for reverse-engineering sale prices or totals.

All calculations update automatically as you type. Results are rounded to two decimal places.