Your result will appear here
Fill in the fields and press Calculate.
A discount calculator tells you two things instantly: what you'll pay after a discount, and how much you save. It sounds simple, but a common trap catches people out — stacked discounts don't add up. A "20% off, then 10% off" deal is not 30% off; each discount applies to the running price, so the real saving is less than the sum.
Enter the original price and the discount, and the sale price plus your savings appear at once — including a second, stacked discount if there is one.
How is it calculated?
The calculation
Sale price = original price × (1 − discount ÷ 100). Savings = original price − sale price. A 200 item at 25% off becomes 200 × 0.75 = 150, saving you 50.
Stacked discounts don't add
Two successive discounts multiply, they don't sum. "20% off then 10% off" on a 200 item is 200 × 0.80 × 0.90 = 144 — a 28% total saving, not 30%. Each percentage is taken off the already-reduced price, so the second discount is worth less in absolute terms. The tool applies them in order and shows the true effective discount.
Effective discount rate
For stacked deals, the effective rate is what single discount would give the same result: from 200 to 144 is 1 − 144/200 = 28%. Knowing the effective rate lets you compare a "20+10" offer against a flat "25% off" (which would give 150 — actually worse for the buyer here).
Where it helps
- Shopping: the real checkout price of a sale item, coupons on top of markdowns.
- Comparing offers: is "buy one get 50% off the second" better than "30% off both"?
- Business: margin impact of promotional discounts.
For adding a percentage (tax, markup) instead of subtracting, a percentage calculator handles both directions.
Worked example
A jacket priced at 200 is in a "20% off" sale, and you also have a 10% coupon. People often expect 30% off — 140. But the discounts stack multiplicatively: 200 × 0.80 = 160 after the sale, then 160 × 0.90 = 144 after the coupon. You pay 144 and save 56, an effective discount of 28%, not 30%. Interestingly, a single flat "25% off" would cost you 150 — so here the stacked "20 + 10" is actually the better deal, which is exactly the kind of comparison the effective rate reveals.
FAQ
How do I calculate a discount?+
Multiply the price by (1 − discount ÷ 100): a 200 item at 25% off is 200 × 0.75 = 150, saving 50. The tool shows both the sale price and the savings.
Do two discounts add together?+
No — they multiply. "20% off then 10% off" is 0.80 × 0.90 = 0.72, a 28% total discount, not 30%. Each discount applies to the already-reduced price.
What is the effective discount on a stacked deal?+
The single discount that gives the same final price. From 200 to 144 is a 28% effective discount. The tool computes this so you can compare stacked offers to flat ones.
Is "20% + 10%" better than a flat "25% off"?+
On a 200 item, 20+10 gives 144 while flat 25% gives 150 — so the stacked deal is better here. The effective-rate comparison tells you which wins for any given numbers.
How much am I saving in total?+
Savings = original price − final price. The tool shows the amount saved alongside the sale price, so you see both the new price and the cash you keep.
How do I add tax after the discount?+
Apply the discount first to get the sale price, then add tax on that. A percentage calculator handles the "add a percentage" step in its add/subtract mode.