Percentage Calculator
Three percentage calculators in one — find amount, find percent, or find total
What is X% of Y?
Percentage Formulas Explained
Mental math shortcut: To find 10% of any number, just move the decimal left one place. $350 → 10% = $35. Then multiply: 20% = $70, 5% = $17.50, 15% = $52.50.
Common Percentage Quick Reference
| Calculation | On $50 | On $100 | On $200 | On $1,000 |
|---|---|---|---|---|
| 5% | $2.50 | $5 | $10 | $50 |
| 10% | $5 | $10 | $20 | $100 |
| 15% | $7.50 | $15 | $30 | $150 |
| 20% | $10 | $20 | $40 | $200 |
| 25% | $12.50 | $25 | $50 | $250 |
| 30% | $15 | $30 | $60 | $300 |
| 40% | $20 | $40 | $80 | $400 |
| 50% | $25 | $50 | $100 | $500 |
| 75% | $37.50 | $75 | $150 | $750 |
Everyday Percentage Examples
Frequently Asked Questions
What is 15% of 200?
15% of 200 = (15 ÷ 100) × 200 = 30. Quick method: 10% of 200 = 20, 5% of 200 = 10, so 15% = 20 + 10 = 30.
30 is what percent of 200?
(30 ÷ 200) × 100 = 15%. Use the "Find Percent" mode above — enter 30 as X and 200 as Y.
What is 20% of $150?
(20 ÷ 100) × 150 = $30. Commonly used for tips, discounts, and tax calculations.
How do I calculate a percentage tip?
Multiply the bill by the tip percentage divided by 100. For a 20% tip on $75: 0.20 × $75 = $15. For 15%: 0.15 × $75 = $11.25.
How do I calculate sales tax?
Multiply the price by the tax rate divided by 100. For 8% tax on $50: 0.08 × $50 = $4 tax → total = $54.
What does "percent" mean?
"Percent" means "per hundred." 25% means 25 out of every 100, or 0.25 as a decimal. To convert a decimal to a percent, multiply by 100. To convert a percent to a decimal, divide by 100.