What changes the result most
Price, quantity, discount order, and coupon size usually move the result most. A fixed coupon has the largest percentage effect on a small subtotal, while a second percentage compounds the first.
Shopping Discount Calculator
Apply two sequential percentage discounts, an order coupon, quantity, and entered sales-tax rate to see final price and savings.
Runs locallyKeyboard friendlyUpdated: August 30, 2026
Enter your scenario
Results update as valid inputs change. Correct any highlighted field before relying on the answer.
Primary result
Final total$76.86
Price per item after percent discounts$81.00
Savings before tax$49.00
Coupon applied$10.00
Estimated sales tax$5.86
Effective pre-tax discount40.83%
Sequential percentage discounts and the fixed coupon reduce $120.00 to $71.00 before the entered sales tax.
The second percentage is applied after the first; store coupon order and tax rules can differ.
Use the result
From calculation to decision
Use this calculator to compare the checkout arithmetic with the advertised offer. Confirm the store’s coupon order and taxable base before relying on the total.
What to do next
Change one high-leverage input, compare the new result with the default, and confirm any current rate, policy, quote, or external rule that controls the real decision.
Save and report
Calculation happens in this browser. Shared links include the visible input values, so inspect the URL before sending a sensitive scenario.
If a result appears wrong, report an issue for this calculator.
When this calculation helps
Use this calculator to compare the checkout arithmetic with the advertised offer. Confirm the store’s coupon order and taxable base before relying on the total.
The result separates the primary answer from supporting values so you can see both the number and the assumptions that produced it. Adjust one field at a time when comparing scenarios; changing several inputs together makes it harder to identify why the answer moved.
Formula / methodology
discounted item = price × (1 − first %) × (1 − second %)
subtotal = discounted item × quantity
taxable subtotal = max(0, subtotal − coupon)
final total = taxable subtotal × (1 + tax %)Percentage discounts are sequential, not additive. A 25% discount followed by 10% removes 32.5% of the original price, not 35%.
Assumptions and limitations
- Both percentage discounts apply to every item.
- The fixed coupon applies once to the order and cannot make the subtotal negative.
- Tax is applied to the post-coupon subtotal.
- Shipping, deposits, recycling fees, and product exclusions are outside the model.
Worked examples
Stacked sale with coupon
A $120 item reduced 25% then 10% becomes $81. A $10 coupon leaves $71 before the entered tax.
Why two 50% discounts are not free
The first discount halves the price; the second halves that remainder, leaving 25% of the original price.
Common mistakes
- Adding sequential percentages together.
- Applying an order coupon to every item.
- Assuming every jurisdiction taxes the same post-discount amount.
FAQ
Can I enter only one percentage discount?
Yes. Set the unused second discount to zero.
Why does the effective discount differ from the sum?
The second discount uses the reduced price as its base, so the percentage reductions compound.
Sources and assumptions
The page uses declared percentage and money arithmetic. The Source Guide identifies prices, coupons, and tax rates as visitor-entered values rather than current market claims.
Updated: August 30, 2026. Method: SHOPPING_DISCOUNT-1.0. Inputs remain visitor-entered unless a data timestamp is shown beside them.
Calculator-specific review
Decision supported: Combine sequential percentage discounts, an order coupon, and an entered tax rate.
Inputs and two scenarios
The inputs below are scenario controls, not facts supplied by a source. Change the values to see how this calculator responds to the decision you are making.
published default example: Original price per item: 120; Quantity: 1; First discount: 25; Second discount: 10; Fixed order coupon: 10; Sales tax rate: 8.25.
materially different higher shopping discount calculator scenario: Original price per item: 180; Quantity: 2; First discount: 37.5; Second discount: 10; Fixed order coupon: 10; Sales tax rate: 8.25.
What changes the result
Discount order matters, while quantity scales the subtotal and a fixed coupon has less proportional effect on larger orders.
Method and evidence boundary
The second percentage applies to the already-discounted price, then the fixed coupon is capped at the remaining subtotal before tax. The formula is arithmetic; store-specific discount order, coupon exclusions, and tax treatment can differ.