Reverse Percentage Calculator
Work backwards from a known percentage: if you know a result and the percentage it represents, the calculator finds the original whole. Perfect for reverse-engineering discounts, taxes and commissions.
Worked example
75 is 15% of: 75 × 100 ÷ 15 = 500
How to calculate
- Enter the result — the part you already know.
- Enter the percentage it represents.
- Read the original whole number.
Formula
Original = Result × 100 ÷ Percent
Explanation
- Finding the pre-tax price when only the total is known.
- Working out the original price before a discount.
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Use CalculatorFrequently Asked Questions
60 is 30% of what number?
60 × 100 ÷ 30 = 200. Enter the part and the percentage above to solve any similar problem.
How is this different from a percentage-off calculator?
A percentage-off calculator works forward from the original price; a reverse percentage calculator works backwards from a known part to the original whole.