Quickly calculate how much you save and what the final price is after any percentage discount.
Enter the original price and discount percentage. The calculator instantly shows the discount amount, final price, and how much you save.
The discount calculator earns its keep whenever you're comparing promotional prices across different retailers, verifying that a 'percentage off' claim is being applied correctly, or evaluating stacked discounts (loyalty card plus sale price). The reverse mode — working backwards from sale price to original — is particularly useful for auditing pricing claims: if a retailer marks something at '50% off £299', that implies an original price of £598, which can be verified independently.
Stacked discounts are additive in perception but multiplicative in reality. A 20% discount followed by an additional 10% discount does not produce a 30% overall reduction. The second discount is applied to the already-reduced price: the combined effect is 1 − (0.80 × 0.90) = 28%, not 30%. This distinction matters when evaluating promotions that combine a sale price with a voucher code or loyalty discount applied at checkout.
A coat priced at £175 goes on sale at 40% off. The actual saving is £70, and the sale price is £105 — not the £35 saving someone mentally estimates from '40% sounds like about a third'. A consumer electronics item is listed at 'was £449, now £315'. Running the reverse calculation reveals the implied discount is 29.8% — slightly under the 30% being advertised in the marketing. Small discrepancies like this are worth checking before assuming the promotional copy is accurate.
Discount Formula
Sale Price = Original Price × (1 − Discount%/100)
Savings = Original Price × (Discount%/100)
To find the original price when you know the sale price: Original = Sale Price ÷ (1 − Discount%/100)
A laptop costs
Result: Final price = $780 — you save $420 (35% off)
Multiply the price by 0.80 (or subtract 20% of the price). Example:
Divide the sale price by (1 − discount rate). Example: $80 ÷ 0.80 =
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