Sequential discounts are multiplied, not added. The fixed coupon is applied after percentage discounts and the result is floored at zero.
Planning estimate only. Platform fees, taxes, payment costs, and policies can change; verify current terms before pricing.
This tool runs in your browser. Inputs and results are not transmitted. If you explicitly save a scenario, its permitted fields stay in local browser storage until you clear them.
Share or report this tool
Page-sharing actions use the canonical page URL and do not include inputs or results unless a tool explicitly says otherwise.
More options
How this calculator works
Formula
After first discount = original price × (1 − first rate ÷ 100). After second discount = first result × (1 − second rate ÷ 100). Pre-tax final = max(0, second result − coupon). Tax = pre-tax final × tax rate ÷ 100.
Worked example
A $200 item discounted 20%, then 10%, with a $5 coupon becomes $139 before tax. At 8% tax, the checkout total is $150.12 and effective pre-tax savings are 30.5%.
Assumptions to verify
- Percentage discounts are applied sequentially rather than added together.
- The fixed coupon is applied after percentage discounts and cannot make the price negative.
- Tax is an editable estimate; taxable bases and local rules can differ.
Frequently asked questions
Why are 20% and 10% not a 30% discount?
The second percentage applies to the already-discounted price, producing a 28% combined percentage reduction before coupons.
Can a coupon create a negative price?
No. The pre-tax price is floored at zero and only the usable coupon amount is reported.
Is the tax estimate guaranteed?
No. Verify the applicable rate and taxable base for the transaction and location.
Privacy: Inputs and results stay in this browser. Any future sponsored recommendation or advertisement will be clearly labeled and kept separate from the calculation.