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Mathematics

Discount Calculator

Variable Legend

P= original pricer= discount rate (%)S= sale priceD= amount saved

Discount and sale price

Amount saved
Sale price

Find rate from prices

Reverse: find original price

Given sale price and rate.

Stacked discounts

Two successive discounts are not additive.

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Pro Tip

Run Discount Calculator twice with only one input changed so you can see which variable really drives the output. For best results with the Discount Calculatorulator, always cross-verify your inputs against source data before calculating. Running the calculation with slightly varied inputs (sensitivity analysis) helps you understand which parameters have the greatest influence on the output and where measurement precision matters most.

Difficulty:Intermediate

Did you know?

Discount Calculator is a good example of how the same arithmetic can feel trivial in one month and significant when the effect is repeated for years.

Mathematically verified
Reviewed May 2026
Used 26K+ times
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