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Discount Calculator

Calculate discounted sale prices, stacked coupon savings, percentage off, and final total including sales tax.

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Optional secondary promotional code or clearance stacking.

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32.5% Total Savings Original: $80.00
Discounted Price
$54.00
With 7% tax: $57.78
You Save
$26.00
32.5% off original price
Price Breakdown 67.5% You Pay • 32.5% Discount

Savings Breakdown

Original Price $80.00
Primary Discount (25%) -$20.00
Additional Coupon (10%) -$6.00
Discounted Price $54.00
Sales Tax (7%) +$3.78
Total Final Amount $57.78

How Stacked Discounts Work

Retailers frequently offer promotions such as "20% off clearance plus an extra 10% coupon at checkout". A common misconception is that this equates to 30% off. In retail practice, discounts are applied sequentially (compounded):

Example on $100 Item:
• 20% off drops the price to $80.
• An additional 10% coupon applies to $80, saving $8, resulting in a final price of $72 (a true 28% total discount, not 30%).

The Discount Formula

Discounted Price = Original Price × (1 − D1) × (1 − D2)
Amount Saved = Original Price − Discounted Price
Effective Discount % = (Amount Saved ÷ Original Price) × 100

Understanding your calculation

Method, example and limitations

How the calculation works

A percentage discount reduces the original price by price × discount ÷ 100. Successive discounts act on the already-reduced price, rather than simply adding rates.

Example to check

A 20% discount on 150 saves 30 and leaves a price of 120 before tax. Two successive 10% discounts leave 81% of the original price.

Before using the result

Check whether tax and shipping are included. A discount followed by the same percentage increase does not restore the starting price.

Calculation methodology · Report a result that needs review