Discount Calculator UK
Find the sale price and amount saved from a discount percentage.
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How it works
A discount reduces the original price by a percentage. The saving is the price times the discount; the sale price is what remains.
Sale price = Price × (1 − discount%)Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percentage to get the saving, then subtract it. 25% off £80 saves £20, giving £60.
What is the formula for sale price?
Sale price = original × (1 − discount / 100). At 25% off, that is original × 0.75.
How do stacked discounts work?
They multiply, not add. 20% then 10% off is 0.8 × 0.9 = 0.72, so you pay 72% — a 28% total discount.
How do I find the original price?
Divide the sale price by (1 − discount). A £60 price after 25% off was 60 / 0.75 = £80.
How do I work out the percentage off?
Divide the saving by the original price and multiply by 100. Saving £20 on £80 is 25%.
Is VAT applied before or after the discount?
UK shelf prices already include VAT, so a discount is taken off the VAT-inclusive price you see.
Working out a discount
A discount calculator finds the sale price and the money saved from an original price and a percentage off. The sale price is original × (1 − discount / 100), and the saving is the original price minus that.
Worked example
A £80 item at 25% off: the saving is 80 × 0.25 = £20, so the sale price is £80 − £20 = £60. Equivalently you pay 75% of the original: 80 × 0.75 = £60.
Stacked discounts
When two discounts apply one after another they multiply, not add. 20% off then a further 10% off is 0.80 × 0.90 = 0.72, so you pay 72% of the price — a 28% total discount, not 30%.
UK shop prices already include VAT, so a percentage off is taken from the VAT-inclusive price you see on the label. You can also work backwards: a £60 item that was 25% off originally cost 60 / 0.75 = £80.
Results are estimates for general guidance in United Kingdom and may not reflect the latest local rates, fees or rules. Check official sources before making decisions.