Discount Calculator
Discount and Sale Price Calculator works out Sale price and Amount saved from Original price, Discount and Second discount applied after the first. The default figures on this page give sale price of 80; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
1 step
- Sale price = 80, saving 20.
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
1 source
What the Discount and Sale Price Calculator calculates
Works out a sale price after one or more discounts, the amount saved, and the original price implied by a discounted price.
How to use this Discount and Sale Price Calculator
Enter Original price, Discount, Second discount applied after the first and Fixed amount off. Sale price updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Sale price, Amount saved and Effective discount.
The method follows Successive discounts multiply rather than add: 20% then 10% off is 28% off, not 30%..
20% off 100 example
With Original price: 100, Discount: 20, the calculator returns Sale price: 80, Amount saved: 20, Effective discount: 20. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Sale price, Amount saved and Effective discount. The inputs you can vary are Original price, Discount, Second discount applied after the first, Fixed amount off, Sales tax or VAT applied to the sale price and Sale price (if known).
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to discount 20% on a calculator?
Works out a sale price after one or more discounts, the amount saved, and the original price implied by a discounted price. Open “How this is worked out” beside the result to see each step for your own figures.
How to do a discount in a calculator?
It needs Original price, Discount, Second discount applied after the first, Fixed amount off, Sales tax or VAT applied to the sale price and Sale price (if known). Nothing else is required, and the figures stay in your browser.
How to take 50% off a price calculator?
The result gives Sale price, Amount saved, Effective discount, Final price including tax, Tax and Original price, each labelled with its unit so the figure can be read on its own.
How do I calculate a 10% discount?
The page opens with worked default figures: sale price of 80. Replace them with your own and every figure updates as you type.
What information do I need for the Discount and Sale Price Calculator?
You need Original price, Discount, Second discount applied after the first, Fixed amount off, Sales tax or VAT applied to the sale price and Sale price (if known). The page opens with default figures that give sale price of 80, so you can see the scale before entering your own.
What does this Discount and Sale Price Calculator show?
It shows Sale price, Amount saved, Effective discount, Final price including tax, Tax and Original price, with the working and any warnings for your entries.