Der ausführliche Ratgeber unten (Erklärung, Rechenbeispiel, Einschränkungen, FAQ und Quellen) ist derzeit nur auf Englisch verfügbar.
Rabattrechner: So funktioniert’s
A percentage discount takes that share off the original price, so the sale price is the original multiplied by one minus the discount. A 20% discount on 2,000 leaves 80% of the price, which is 1,600.
Stacked discounts do not add up. Each one applies to the price left after the previous one. 20% off followed by another 10% off multiplies 0.80 by 0.90 to get 0.72 of the original, so the real saving is 28%, not 30%. You can also work backwards: given a sale price and the discount, the original price is the sale price divided by one minus the discount.
This matters when a shop shows a headline such as 50% off and then offers a further voucher at checkout. Working out the true final price lets you compare it with a competitor's plain price, or with the same item at a different shop, before you decide whether the deal is real.
Formel und Annahmen
Formel
Angebotspreis = Ursprungspreis × (1 − Rabatt %)Zwei Rabatte: Ursprungspreis × (1 − R1 %) × (1 − R2 %)
Annahmen
- Ein zweiter Rabatt wird auf den bereits reduzierten Preis angewendet (die Prozentsätze werden nicht addiert).
- Steuern sind nicht enthalten.
Rechenbeispiel
2,000 item with 20% off, then an extra 10% coupon
- After the first discount: 2,000 × 0.80 = 1,600.
- After the coupon: 1,600 × 0.90 = 1,440.
- Total saved = 2,000 − 1,440 = 560, which is 28% of the original.
- Reverse: a sale price of 1,440 after 28% off means the original was 1,440 ÷ 0.72 = 2,000.
Ergebnis: Final price 1,440; you save 560 (28%).
Einschränkungen
- Taxes are not included. Whether tax is charged before or after the discount depends on the shop and the country.
- Buy-one-get-one, tiered, or minimum-spend offers are not modelled; use the equivalent percentage for those.
- "Up to" discounts and inflated original prices are marketing; this calculator cannot tell whether the original price was genuine.
- Shops may round each step, so the amount at the till can differ by a small amount.