Calculate percentage, fixed, sale-price, and Buy-X-Get-Y discounts with whole-item bundle rules, sequential coupons, tax, quantity, and unit-price comparisons.
Choose your path
Model a real checkout order across single-item, quantity, complete-bundle, sequential-coupon, tax, and pack-comparison decisions without inventing fractional free items.
Translate a headline offer into the amount actually paid and saved.
Choose percentage, fixed, or sale-price mode; enter price and quantity; then inspect subtotal, savings, unit price, and tax.
Can reproduce the order math and compare it with checkout rather than relying on the headline percentage.
Know how many items are paid and free when quantity does not divide evenly into bundles.
Choose Buy-X-Get-Y, enter positive whole X/Y values and received quantity, then inspect paid/free fulfillment.
Understands that Buy 2 Get 1 across seven received items means five paid and two free, with no fractional award.
Apply multiple coupons in the seller-relevant order and see tax separately.
Add sequential percentage or fixed order-level adjustments, enter tax, and audit each displayed step.
Does not add percentage discounts arithmetically or mistake the pre-tax subtotal for the payable total.
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The discount amount is the portion of the original price removed by the sale percentage.
Discount Amount = Original Price × (Discount % ÷ 100)The sale price is what you pay after the discount is applied. Alternatively, multiply the original price by the remaining percentage.
Sale Price = Original Price − Discount Amount = Original Price × (1 − Discount % ÷ 100)Buy-X-Get-Y awards free items only for complete X+Y bundles within the received quantity. Additional percentage or fixed coupons are applied sequentially to the current order subtotal.
Paid items = full bundles × X + min(remainder, X)Updated: August 2026
A shopper finds wireless headphones marked down 40% from $89 during a holiday sale.
→ Sale price: $53.40, savings: $35.60
An item at $120 with an additional 15% coupon applied at checkout — calculate the combined effective discount.
→ Final price: $81.60 (32% total off, not 35%)
Seven received items contain two complete three-item bundles, so five items are paid and two are free; the remaining item does not create a fractional free item.
Stacked discounts are multiplicative, not additive. 20% off plus 15% off equals 32% total off, not 35%. Apply each discount sequentially to the current price.
A 25% discount means you pay 75% of the original price, not 25%. Double-check whether the percentage refers to the amount saved or the amount you pay.
Model the checkout order rather than a headline percentage alone. The tool reports pre-tax subtotal, savings, paid/free items, coupon sequence, effective unit price, tax, and payable total; confirm retailer stacking and tax rules at checkout.