Stacked coupon math
Two discounts are applied sequentially. A 20% discount followed by 10% off does not equal 30% off; it makes the item 28% off overall.
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Discount estimator
Calculate sale prices, stacked coupon savings, reverse discounts, tax, and cart totals before you check out.
Tax after discounts
The estimator calculates sales tax from the discounted subtotal, then shows tax-adjusted item and cart totals for quick checkout planning.
Reverse discount
Enter the price you want to pay and the original price to see the percent-off coupon or sale you would need.
Discount calculator guide
How this discount estimator works
This discount estimator turns an original price and percent-off sale into a final price, amount saved, effective discount, and tax-adjusted total. It is built for quick checks in a store aisle, during online shopping, or while comparing coupon codes.
If you have two coupons, the calculator applies the first discount, then applies the second discount to the reduced price. That mirrors how many stacked sale and coupon offers work in practice.
Sale price formula
For one discount, subtract the percent from 100%, convert that number to a decimal, and multiply it by the original price.
Stacked discount formula
For stacked discounts, calculate the first sale price, then apply the second discount to that lower price. The effective discount is the total savings divided by the original price.
Reverse percent off
Reverse mode divides the savings needed by the original price. A $100 item that needs to end at $75 requires a 25% discount.
Cart total estimate
Quantity multiplies the discounted item price before tax, then sales tax is added to estimate the cart total.
Discount estimator FAQ
Quick answers for common discount calculator, sale price calculator, percent off calculator, and coupon calculator searches.
How do I calculate a discount?
Multiply the original price by one minus the discount percent. For example, 20% off $100 is $100 x 0.80, or $80.
Are stacked discounts added together?
Usually no. Stacked discounts are applied one after another. A 20% discount followed by 10% off makes a $100 item cost $72, which is a 28% effective discount.
How do I calculate a reverse discount?
Use reverse mode when you know the original price and the final price you want. The estimator returns the percent-off discount needed to hit that final price.
Does the discount estimator include tax?
This calculator applies sales tax after the discount and quantity are calculated, then shows both tax and final cart total.
Privacy and measurement
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