Formulas
| Question | Formula | Example (A = 20, B = 150) |
|---|---|---|
| A% of B | B × A ÷ 100 | 30 |
| A is what % of B | A ÷ B × 100 | 13.33 % |
| % change from A to B | (B − A) ÷ A × 100 | +650 % |
| B increased by A% | B × (1 + A ÷ 100) | 180 |
| B decreased by A% | B × (1 − A ÷ 100) | 120 |
Enter two numbers and every result updates instantly. Percentage points are different from percent: going from 10 % to 12 % is +2 percentage points but a 20 % increase.
Frequently asked questions
How do I calculate a percentage increase?
Subtract the old value from the new one, divide by the old value and multiply by 100.
What is the percentage difference?
The absolute difference divided by the average of the two numbers, times 100 — used when neither value is the reference.
Can I use decimals?
Yes, any decimal or negative number works.