Stacked discount calculator

Try the example by hand

Worked example: $80 with 25% off becomes $60. A further 10% off removes $6, leaving $54. That is a 32.5% reduction from $80, not 35%. A $5 coupon after both discounts would make the subtotal $49.

The order used here

First discount → second discount → dollar coupon → estimated tax. Each percentage discount multiplies the remaining price by one minus the discount rate. A dollar coupon is then subtracted from that reduced price. The displayed effective discount compares the final pretax subtotal with the original price.

The two percentage factors can swap places without changing the mathematical result. Moving a dollar coupon before a percentage discount can change the result. Check the actual promotion terms before deciding which sequence describes your purchase.

Tax is an estimate

The tool applies the tax rate you supply to the discounted subtotal. Actual checkout treatment can differ by location, item, and coupon type. Use the retailer’s final checkout amount for a purchase decision. A zero rate is the default so that the example demonstrates discount arithmetic without assuming a jurisdiction.

Compare with the price you would otherwise pay

A large percentage off a list price does not establish that the final price is competitive. Compare the final total against another seller’s current total for the same item and condition. Shipping, membership requirements, return costs, and delayed rebates can overturn the apparent saving.

Cashback is not entered as a coupon here. It may arrive later or depend on eligibility, tracking, approval, or a redemption threshold. Keep it separate until you can establish both its terms and its value to you.