Reverse Percentage Calculator
You know the final price and the percentage that was added or removed — this finds what the number was before.
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The formula
For a decrease: original = final ÷ (1 − percentage ÷ 100)
For an increase: original = final ÷ (1 + percentage ÷ 100)
Common use: a shirt costs $85 after a 15% discount — what was the original price? Answer: $85 ÷ 0.85 = $100.