Discount Calculator | Calculate Sale Price & Savings Free

Discount Calculator

This calculator applies one or two discount percentages and an optional sales tax rate to a starting price, then reports the final price along with the amount saved. The primary discount alone covers a straightforward markdown, the extra discount field covers a stacked situation such as a clearance percentage plus a coupon code, and the tax field covers sales tax charged at checkout. Leaving the extra discount and tax fields blank applies only the primary discount to the original price.

How the calculation works

Each discount reduces the current price by its percentage, and a second discount is applied to the price that is already reduced, not to the original amount. Tax, when entered, is added last and calculated on the twice discounted price, not on the original sticker price. Because discounts compound instead of adding, a 20% discount followed by a 15% discount does not equal 35% off: multiplying 0.80 by 0.85 gives 0.68, so the combined reduction is 32% off the original price. The final price and savings amount are rounded to two decimal places, matching standard currency display.

Worked examples

An $84.99 jacket with a 25% discount and 7% sales tax: 84.99 × 0.75 = 63.74 before tax. Adding 7% tax brings the total to 68.20, a saving of 16.79 off the original price. Here the tax is large enough to claw back part of the discount, but not all of it.

A $150 item with a 20% discount and an extra 15% off at checkout, with no tax entered: 150 × 0.80 = 120, then 120 × 0.85 = 102. The final price is 102.00, a saving of 48.00, matching the 32% combined reduction described above.

Formula

Final Price = Price × (1 - Discount / 100) × (1 - Extra Discount / 100) × (1 + Tax / 100)
Savings = Price - Final Price

Discount percentage to price multiplier