Discount calculator.
The final price after a percent off — and the dollars you save.
Working out a sale price
A percent-off discount is simple: multiply the price by the discount to get the saving, then subtract. 25% off $120 is 0.25 × 120 = $30 saved, for a $90 sale price. A useful shortcut for the final price is to multiply by one minus the discount — $120 × 0.75 = $90 — which skips the subtraction step. Watch out for "stacked" discounts: an extra 10% off an already-30%-off price isn't 40% off, because the second discount applies to the reduced price (it works out to 37% off). Sales tax, if any, is added to the discounted price — the sales tax calculator handles that.
Working backwards to the original price
Sometimes you know the sale price and the discount but not the original. Divide the sale price by one minus the discount: a $90 item marked 25% off started at 90 ÷ 0.75 = $120. The same trick turns a dollar saving into a percent — divide the amount saved by the original price. If a $200 jacket is now $150, you saved $50, and 50 ÷ 200 = 0.25, so it's 25% off.
This matters because retailers often advertise the dollars off rather than the percent, and the two feel different at a glance. A "$40 off" tag is a big deal on a $60 item (67% off) but minor on a $600 one (about 7%). Converting to a percent lets you compare deals across price points on equal footing.