Find a percent of an amount
Enter a percent and an amount. We’ll do the math.
Result
Result: 15
Because 7.5% × 200 = 15
About this calculator
Quickly find a percentage of any amount—great for tips, discounts, and commissions. Enter a percent and an amount; we’ll show the result and the math.
Examples
- Tip: 20% of $65
- Discount: 25% off $80
- Commission: 7.5% of $2,000
FAQ
- What is a percentage?
- A percentage expresses a number as a fraction of 100 and uses the % symbol. For example, 25% means 25 out of 100.
- How do I find a percent of an amount?
- Multiply the amount by the percent in decimal form. Example: 15% of 200 = 0.15 × 200 = 30.
- What can I use this for?
- Tips, discounts, commissions, interest, grades—any time you need 'X% of Y'.
- Can I calculate percentages in my head?
- For simple percentages like 10%, divide by 10. For 20%, divide by 5. For 5%, divide by 20. Example: 10% of 200 = 200 ÷ 10 = 20.
- Why multiply by 0.15 instead of dividing by 100?
- Converting the percentage to decimal form (15% = 0.15) gives the same result as (amount × 15) ÷ 100, but it's one fewer step and easier to calculate.
- What if I want to find a percentage greater than 100%?
- You can! 150% of 200 = 300. This is common in growth calculations, markup pricing, or when comparing increases that exceed the original value.
- How do I convert a percentage to a decimal?
- Divide by 100 or move the decimal point two places left. 15% becomes 0.15, 7.5% becomes 0.075, and 100% becomes 1.0.
Common Mistakes to Avoid
- Forgetting to convert: Don't multiply by 15 directly—use 0.15 or divide by 100 first. Wrong: 200 × 15 = 3000. Right: 200 × 0.15 = 30.
- Mixing up operations: For "X% of Y" you multiply; for "what percent is X of Y" you divide. Know which calculation matches your question.
- Rounding too early: Keep all decimal places during calculation, then round to 2 decimal places in your final answer for precision.
- Confusing increase vs total: A 20% increase on $100 makes $120 total (not $20). The $20 is the increase amount, not the final value.
Real-World Examples
🍽️ Restaurant Tip
Your dinner bill is $48.50. You want to leave an 18% tip.
Calculation: 18% of $48.50 = 0.18 × 48.50 = $8.73
Total to pay: $48.50 + $8.73 = $57.23
🛍️ Store Discount
A jacket costs $120. It's on sale for 30% off.
Discount amount: 30% of $120 = 0.30 × 120 = $36
Final price: $120 − $36 = $84
💰 Sales Commission
You sold $5,000 worth of products. Your commission rate is 7.5%.
Your commission: 7.5% of $5,000 = 0.075 × 5000 = $375
Need a different calculation? Try What percent is one number of another or Percent change.