Discount Calculator
Use this sale price calculator to work out the final price after stacked discounts and an optional coupon, with every step shown.
Formula & worked example
Formula: Price after each step = price × (1 − discount ÷ 100); a coupon is subtracted as a fixed amount. Total discount = (original − final) ÷ original.
Example: 120 with 25% then 10% off = 81 (32.5% off, not 35%). A 5 voucher applied last makes it 76.
Method & source: Successive percentage-change method (multiplying the remaining fractions). See how we test our calculators.
Next step: try reverse percentage or percentage change.
What Is a Sale Price Calculator?
A sale price calculator shows what an item really costs after one or more discounts. Shops often combine a percentage off with a further reduction or a voucher, and the final price is not what simply adding the percentages suggests.
This sale price calculator with stacked discounts applies up to three percentage discounts one after another, then an optional coupon, and shows the price after every step and your true total saving.
How Our Discount Calculator Works
Enter the original price and up to three percentage discounts. Add a fixed coupon if you have one.
- Stacked percentages: each discount is taken from the price left after the previous one.
- Coupon order: choose whether the coupon is applied before or after the percentages.
- Step table: see the amount taken off and the price after each step.
- Real discount: the total percentage you actually save compared with the original price.
- Reality check: a note shows what adding the percentages together would wrongly suggest.
Prices never go below zero, and a 100% discount simply brings the price to nothing.
Why Checking Stacked Discounts Matters
A headline such as “20% off, plus an extra 10%” sounds like 30%, but the maths says otherwise.
- See the real price before you decide to buy.
- Compare two offers with different combinations of discounts.
- Understand why two 10% discounts are not a 20% discount.
- Check whether a voucher is worth more before or after the sale percentage.
- Avoid being misled by adding percentages together.
A few seconds with a discount calculator turns a confusing promotion into one clear number.
Worked walkthrough: a promotion with a voucher
A jacket costs 120 with 25% off, plus an extra 10% for members and a 5 voucher. The first discount takes off 30, leaving 90. The second takes 9 off that, leaving 81. The voucher applied last brings it to 76, a total saving of 44 or about 36.7%. Adding 25% and 10% would suggest 35%, but the percentages alone save 32.5%. If the voucher is taken off before the percentages, the price becomes 77.63 instead, so applying it last is 1.63 cheaper in this case.
Practical tips for discount calculations
- Do not add percentages together. Two discounts of 20% and 10% give 28% off, not 30%.
- Read the small print about the order of discounts: some shops apply a voucher first, which can change the final price.
- To compare deals, convert everything to a final price rather than comparing headline percentages.
- For a “buy one, get one half price” offer, enter the total price of both items and the effective discount to check the saving.
- Use the Reverse Percentage Calculator if you know a sale price and need to find what the item cost before the discount.
Frequently Asked Questions (FAQs)
Multiply the original price by (1 − discount ÷ 100). A 20% discount on 100 gives 100 × 0.80 = 80.
Each discount applies to the price left after the previous one. 20% then 10% then 5% off 100 gives 100 × 0.80 × 0.90 × 0.95 = 68.40, a total saving of 31.6%, not 35%.
A fixed coupon usually saves more if taken off after the percentage discounts, but a percentage applied after a coupon may save less. Use the coupon option in this discount calculator to compare both.
Use the Reverse Percentage Calculator, which divides the sale price by (1 − discount ÷ 100).
No. A 100% discount makes the item free, and the calculator limits each percentage to between 0% and 100%.