Know a part and its percentage? Find the original whole number instantly (X is P% of what?).
| Input | Result |
|---|---|
| 30 is 20% of | 150 |
| 45 is 15% of | 300 |
| 12 is 150% of | 8 |
When you know the final amount and the percentage it represents but not the original — e.g. a $90 price is 75% of the original, so the original was 90 ÷ 0.75 = $120.
If a value grew by P%, the original = final ÷ (1 + P/100). A $115 price after a 15% increase started at 115 ÷ 1.15 = $100.
Yes — 12 being 150% of a number means the original is smaller: 12 ÷ 1.5 = 8.