Percentage Calculator
Five percentage calculators on one screen: X% of Y, X is what percent of Y, X is P% of what number, percent change (increase or decrease) and percent difference. Each shows the formula with your numbers.
Percentage calculator
Type in any row; the answer and the working update as you type.
Percentage change (increase or decrease)
Percentage difference
Percentage formulas
| Question | Formula |
|---|---|
| What is P% of X? | P ÷ 100 × X |
| X is what % of Y? | X ÷ Y × 100 |
| X is P% of what? | X ÷ (P ÷ 100) |
| Percent change from A to B | (B − A) ÷ |A| × 100 |
| Percent difference of A and B | |A − B| ÷ ((A + B) ÷ 2) × 100 |
Change vs difference: use percent change when there is a before and after (a price went from $80 to $100: +25%). Use percent difference to compare two values with no direction (80 and 100 differ by 22.22%).
Common percentages as decimals and fractions
| Percent | Decimal | Fraction |
|---|---|---|
| 1% | 0.01 | 1/100 |
| 5% | 0.05 | 1/20 |
| 10% | 0.1 | 1/10 |
| 12.5% | 0.125 | 1/8 |
| 20% | 0.2 | 1/5 |
| 25% | 0.25 | 1/4 |
| 33.33% | 0.3333 | ≈1/3 |
| 50% | 0.5 | 1/2 |
| 66.67% | 0.6667 | ≈2/3 |
| 75% | 0.75 | 3/4 |
| 100% | 1 | 1 |
Common questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply. 15% of 240 = 0.15 × 240 = 36.
How do I work out what percent one number is of another?
Divide the part by the whole and multiply by 100. 36 out of 240 = 36 ÷ 240 × 100 = 15%.
How do I find the original number before a percentage?
Divide by the percentage as a decimal. If 36 is 15% of a number, the number is 36 ÷ 0.15 = 240.
How do I calculate percentage increase?
Subtract the old value from the new one, divide by the old value and multiply by 100. From 80 to 100: (100 − 80) ÷ 80 × 100 = 25%.
What's the difference between percent change and percent difference?
Percent change measures a move from an old value to a new one. Percent difference compares two values on equal terms, dividing by their average.
Sources
Related
General information, not financial, tax or legal advice. Check important numbers with the official source before acting on them.