Money
Discount Calculator
See exactly what you'll pay after a discount, and optionally add sales tax on top of the discounted price.
- Enter the original price (before tax).
- Enter the discount percentage (0–100).
- Optionally turn on tax and enter the rate.
0 to 100
How it works
Enter the original price and the discount percentage. The calculator multiplies the price by the discount rate to find the amount saved, then subtracts it to give the sale price. Every money amount is rounded to the nearest cent, just like a shop till.
If you switch on sales tax, the tax rate is applied to the discounted price, not the original price. This is how most shops in places with separately listed sales tax work. If the price on the shelf already includes tax, such as VAT in many countries, leave the tax option off so it is not counted twice.
Because the calculator shows the discount amount, the sale price, the tax and the final total on separate lines, you can compare each figure with the receipt or price tag and spot exactly where a difference comes from.
Formula
Discount = Price × Discount% ÷ 100
Sale price = Price − Discount
Tax = Sale price × Tax% ÷ 100 (tax excluded from price, added after discount)
Worked examples
$80 at 25% off with 8% tax: discount $20, sale price $60, tax $4.80, total $64.80.
Clothing sale
A 60 jacket at 30% off: discount 18, sale price 42. You save 18.
Electronics with tax
A 450 TV at 15% off with 7% tax: discount 67.50, sale price 382.50, tax 26.78, total 409.28.
Comparing two offers
“25% off” a 120 item costs 90, while “30 off” costs 90 as well — the two offers are worth the same on this item.
Understanding the result
This calculator treats the original price as tax-excluded and adds tax after the discount, which is how most US-style receipts work. If your price already includes tax, leave the tax option off.
Common mistakes
- Adding two discounts together. 20% off and then an extra 10% off is 28% off in total, not 30%.
- Applying tax before the discount, which makes the total look higher than it will be at the till.
- Adding sales tax to a price that already includes VAT or GST.
- Forgetting delivery or service fees, which are usually not discounted.
When to use it
- Checking the real price of an item during a sale or with a coupon code.
- Comparing a percentage discount with a fixed amount off.
- Estimating the final total at the checkout, including tax.
- Setting sale prices for your own shop or market stall.
FAQs
- Are two 10% discounts the same as 20% off?
- No — stacked discounts multiply: 10% then 10% equals 19% off in total.
- How is rounding handled?
- Every money amount is rounded to the nearest cent, the same way a till does.
- How do I work out the discount percentage from two prices?
- Use the percentage change mode of the Percentage calculator: from the original price to the sale price. A drop from 50 to 40 is a 20% discount.
- Does the calculator support my currency?
- Yes. Pick from 15 currencies in the Currency menu; your choice is remembered on this device.
- Is tax ever charged on the original price?
- Some places tax the pre-discount price for manufacturer coupons. Check your local rules if the till total differs.
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