How it works
Apply a second discount to an already discounted price. Discount percentages cannot simply be added.
final = price(1−a)(1−b)
Worked example
Show example inputs and result
Original price: 1,000 · First discount: 20 · Second discount: 10.
- Final price
- 720
- Equivalent discount
- 28 %
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy