doomath Calculator
Discount Calculator
Calculate discount savings and final sale price from an original price and discount percentage.
InputsChange a value to recalculate instantly
ResultUpdates as you type
How it worksTransparent math
Calculation details are shown above.
Result breakdownSee the important numbers together
1Discount amount$20
2Final price$80
λ DooMathWork with this calculation
Local · deterministic · optionalQuick mathNatural-language-style shortcuts for deterministic arithmetic.
Calculator guide
How to use the Discount Calculator
Calculate discount savings and final sale price from an original price and discount percentage.
01Set inputsChoose values, units and assumptions.
02Apply the modelDiscount = Original price × Discount rate. Sale price = Original price − Discount.
03Read the resultCheck the output against the assumptions before using it.
What this calculator does
Apply a single discount rate to the original price.
Formula & method
Discount = Original price × Discount rate. Sale price = Original price − Discount.
Assumptions & notes
- Taxes, shipping and stacked promotions are not included.