Discount Calculator
Sale price, percent off, original price before a discount, stacked discounts, and final price with sales tax
A discount question usually has one of five shapes: what's the sale price, what percent was actually taken off, what was the original price before a discount, what do several discounts stacked together really add up to, or which of two different-looking deals is actually cheaper. This calculator handles all five as separate modes rather than one formula stretched to cover everything.
Worked Examples
A $120 item at 25% off saves $30, for a sale price of $90.
If a $90 sale price reflects a 25% discount, the original price was $90 ÷ 0.75 = $120, matching Example 1 in reverse.
A $100 item with 20% off, then an additional 10% off the already-reduced price, comes to $100 × 0.80 × 0.90 = $72. That's a combined discount of 28%, not the 30% you'd get by simply adding the two percentages.
How to Calculate a Discount
Multiply the original price by the discount percentage divided by 100 to get the amount off, then subtract it from the original price. For example, 25% off $120 is $30 off, so the sale price is $90.
Quick Percent-Off Shortcuts
10% off: move the decimal one place and subtract. 20% off: multiply by 0.80. 50% off: halve the price. Use the buttons in Sale Price mode for 15%, 25%, 30%, 40%, and 70% off.
Discount Plus Sales Tax
In most places tax is charged on the price after the discount. This calculator applies the tax rate you enter to the sale price. Rules can differ for coupons and manufacturer rebates, so check the receipt.