Discount Calculator

Multiply the original price by the discount percentage and divide by 100 to get how much you save, then subtract that from the original. So a 25% discount on £80 saves you £20, leaving a sale price of £60. The calculator does this in one go on the % off → sale price tab.

Subtract the sale price from the original to get the saving, divide that by the original, then multiply by 100. £80 down to £60 is a £20 saving, divided by £80 = 0.25, so 25% off. Use the What % off? tab to do it without the arithmetic.

It means the price has been halved — the sale price is half the original. UK consumer-protection rules say a 'was/now' price has to be genuine: under the Chartered Trading Standards Institute's Pricing Practices Guide and the CMA's enforcement, the higher 'was' price should have been the actual selling price for a meaningful period (typically 28 days) before the discount, otherwise the comparison is misleading. The calculator just tells you the maths; whether the headline price was genuine is on the retailer.

No — and the difference matters. '20% off then an extra 10% off at checkout' is *not* 30% off; it's 20% off, then 10% off the discounted price, which works out to 28% off the original. Each discount applies to the running total, so stacking always gives a smaller saving than the sum of the percentages. This calculator does one discount at a time; chain it manually for stacked deals.

It depends on whether the prices on display are VAT-inclusive (which is standard in UK retail) or VAT-exclusive (more common in B2B). UK retail price tags include VAT, so the discount is calculated on the gross price you see — the percentage off applies to whatever's printed. For B2B quotes that show net prices, take the discount on the net first, then add VAT to the discounted net using the VAT calculator.