How a percentage discount works

Multiply the original price by the discount rate as a decimal to find the savings. Subtract that amount from the original price. A 25% discount on $120 saves $30 and leaves a $90 sale price before tax.

Applying sales tax

This calculator applies tax after the discount, which is common but not universal. Multiply the discounted subtotal by one plus the tax rate. Local rules may treat coupons, rebates, and tax differently.

Stacked discounts are not added

Two consecutive 20% discounts do not equal 40% off. The second reduction applies to the already discounted price, producing a combined reduction of 36%.

Currency formatting uses US dollars. Verify tax treatment and checkout totals with the seller.