Pick the question you need answered and type your numbers. The answer and the formula update as you type.
12
(15 ÷ 100) × 80
15% of 80 is 12.
“Percent” means “per hundred”, so 15% is 15 out of every 100. Almost every percentage question is one of the three this calculator handles.
| Question | Working | Answer |
|---|---|---|
| What is 20% of 150? | (20 ÷ 100) × 150 | 30 |
| What is 13% of 59.99? | (13 ÷ 100) × 59.99 | 7.80 |
| 45 is what % of 60? | (45 ÷ 60) × 100 | 75% |
| Change from 1,200 to 1,500 | ((1,500 − 1,200) ÷ 1,200) × 100 | +25% |
| Change from 50 to 35 | ((35 − 50) ÷ 50) × 100 | −30% |
Divide the percentage by 100, then multiply by the number. For example, 15% of 80 is (15 ÷ 100) × 80 = 12.
Divide the part by the total, then multiply by 100. For example, 12 out of 80 is (12 ÷ 80) × 100 = 15%.
Subtract the old value from the new value, divide by the old value, then multiply by 100. Going from 80 to 100 is ((100 − 80) ÷ 80) × 100 = a 25% increase.
Because each percentage is based on a different starting value. 100 up 50% is 150, but 150 down 50% is 75, not 100.