Discount calculator
A discount always comes off the current price: multiply the price by the percentage, divide by a hundred and subtract — or more simply, multiply by what remains, since 30% off means you pay 70%.
- You save
- €25.00
Rates and thresholds
- Final price
- price × (100 − discount) ÷ 100
- 20% off €50
- €40
- 50% off €50
- €25
How do I work out a discount in my head?
Find a tenth of the price by shifting the decimal one place left, then multiply. For 30% off €80: a tenth is 8, three tenths is 24, so you pay €56. For half price — 50% — just divide by two.
How do two discounts in a row work?
They multiply rather than add. "30% off plus another 20% at the till" is not 50% but 44%: €100 × 0.7 = 70, then 70 × 0.8 = €56. Two discounts always total less than their sum, because the second comes off an already reduced price.
How do I find the original price from the sale price?
Divide the sale price by what remained. If a 30%-off item cost €56, the original was 56 ÷ 0.7 = €80. The common mistake is adding 30% back to the sale price, which gives €72.80 — short of the real price, because the percentage is taken from the wrong number.
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