🏷️ Discount Calculator
Sale price and amount saved from original price and discount %. Runs privately in your browser.
Working out what you actually pay
The maths is straightforward: the discount amount is the original price multiplied by the percentage, and the final price is the original minus that amount. The calculator shows both numbers so you can sanity-check a till receipt or an online checkout.
It is most useful for stacking comparisons: a 30%-off coupon on a 80 item saves 24, but whether that beats a rival store's flat 20 price depends on the base price, not the headline percentage. Retailers know a bigger percentage reads as a better deal even when it is not — always compare final prices, never percentages.
Discount amount = price × (percentage ÷ 100). Final price = price − discount amount. For example, 20% off 50 is 10 off, leaving 40.
A 120 jacket at 35% off
A jacket listed at 120 with a 35% discount: the discount is 42 and the final price is 78. If a second shop sells the same jacket at 95 with 15% off, the final price there is 80.75 — the bigger percentage (35) wins, but only by 2.75. Comparing final prices reveals that; comparing percentages hides it.
Why stacked discounts never add up
- Stacking discounts by adding percentages. 20% off followed by another 20% off is 36% total, not 40%.
- Calculating the percentage on the discounted price. Discounts always apply to the original price unless stated otherwise.
- Ignoring VAT or sales tax differences between stores — the pre-tax winner can lose after tax.
- Forgetting that a 'save 50' claim is only meaningful relative to the original price: 50 off 200 is 25%; 50 off 500 is 10%.
Discount questions
How do I calculate a double discount?
Apply the first percentage to the original price, then the second percentage to the new price. Or divide: final = price × (1 − d1) × (1 − d2).
Is a bigger percentage always better?
No. What matters is the final price. A 50% discount on a small base can be cheaper than a 30% discount on a bigger one.
Does this include tax?
No — it works on the listed price. Add your local sales tax or VAT afterwards if you need the till figure.
What is 25% off 80?
The discount is 20 and the final price is 60. Verify with the calculator by entering 80 and 25.
Can I use it for markups instead?
Yes, in reverse: if you know cost and want a margin, the same percentage arithmetic applies — just interpret the base differently.
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Tip: double-check inputs before relying on results for important decisions.