Discount Calculator
Enter the original price and the discount % to see the sale price and what you save. Useful for shop-window quick-checks, voucher codes and stacked promotions.
Sale price
£60.00
- You save
- £20.00
- Discount applied
- 25%
Sale price = original × (1 − discount%). You save = original − sale price. The discount is clamped to 0–100% — a 100% discount makes the item free, anything more is treated as 100%.
How to use this calculator
Enter the original price exactly as marked on the tag, then enter the discount as a percentage (e.g. 25 for "25% off"). The calculator returns the sale price (what you pay) and the savings (what comes off). Currency is not assumed — the number is the same whether you read it as pounds, dollars or euros.
How the calculation works
Sale price = original × (1 − discount/100). You save = original − sale price. The discount is clamped to the 0–100% range, so a 100% discount makes the item free and a value above 100% is treated as 100% (you can't save more than the price).
Worked example
A jacket marked at $80 with 25% off: you save 80 × 0.25 = $20, sale price 80 − 20 = $60. A £150 dress with 40% off: you save 150 × 0.40 = £60, sale price £90. A €1,200 sofa with 15% off: save €180, pay €1,020.
Frequently asked questions
How do I calculate the price after a discount?
Multiply the original price by (1 − discount/100). For 25% off £80: 80 × 0.75 = £60. For a quick mental shortcut, compute 10% of the price (move the decimal one place left), then scale: 10% of £80 = £8, so 25% ≈ £20, leaving £60.
Does this work for stacked discounts (e.g. 20% off, then a 10% voucher)?
Stacked discounts are not additive — they multiply. For 20% off then 10% off: final = original × 0.80 × 0.90 = original × 0.72 (a 28% total discount, not 30%). To use this calculator for stacked offers, run it once per stage: enter the result of the first discount as the "original price" for the second.
What about tax or VAT?
The discount is applied to whatever number you enter. If your shop shows tax-inclusive prices (most of the UK and EU), enter the marked price and the result already includes tax. If your shop shows pre-tax prices (most of the US), apply tax to the sale price after the calculation.
Can I work backwards from a sale price to a discount %?
Yes — the relationship is symmetric. Discount % = (1 − sale/original) × 100. For example, a £100 item now £75: (1 − 75/100) × 100 = 25% off. Our percentage calculator (coming soon) handles this case directly.
Why is a "50% off, plus an extra 50%" not free?
Because each discount applies to the running price, not the original. 50% off £100 = £50; another 50% off £50 = £25, for a 75% total discount. This is how nearly all stacked-promo rules work in practice — read the small print, but assume multiplicative unless told otherwise.
Does the calculator handle negative or above-100% discounts?
Discounts are clamped to 0–100%. A negative discount makes no sense (it's a price increase), and anything above 100% is treated as 100% — the item is free, you can't save more than the price itself.