Percent off
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What is a discount calculator?
A discount calculator finds the sale price after a reduction is applied to the original price. It works whether the discount is expressed as a percentage (e.g., 25% off) or as a fixed dollar amount (e.g., $15 off). The result includes the final price and the amount saved so you can verify a deal at a glance — without doing mental math in the store or at checkout.
For shoppers, it answers the most common checkout question instantly. For business owners and retailers, it shows exactly how a discount affects revenue before a promotion goes live. A 30% storewide discount on a $120 item means the customer pays $84 and the seller gives up $36 — a calculation that changes the margin picture significantly at any volume.
How to use this discount calculator
Percent off. Enter the original price and the discount percentage. The calculator returns the sale price, the dollar amount saved, and confirms the effective discount rate. Use this for the most common scenario: a percentage-off sale, coupon, or promotional deal.
Dollar off. Enter the original price and a fixed dollar discount (e.g., a $20 coupon). The calculator returns the sale price and automatically calculates what percentage the discount represents, so you can compare it against other deals.
Stacked discounts. Enter the original price and two consecutive discount percentages. Stacked discounts are applied sequentially, not additively — a 20% discount followed by an additional 10% off does not equal 30% off. For example, $100 with 20% off gives $80, then 10% off that gives $72 — an effective discount of 28%, not 30%. The calculator shows the true effective discount and the exact final price.
Sales tax (optional). Enable the tax option in any mode and enter your local tax rate. Tax is always calculated on the discounted price, not the original. A $120 item at 25% off sells for $90; at 8% sales tax, the total comes to $97.20.
Discount formulas
When sellers need a discount calculator
Running a promotion without checking the numbers first is a common mistake. A 40% discount sounds manageable, but if the product margin is only 35%, every discounted sale runs at a loss. Use this calculator to see the revenue impact before a promotion goes live — then pair it with the Profit Margin Calculator to confirm the margin holds after the discount is applied.
Stacked promotions require extra care. If you offer 20% off sitewide and email subscribers get an additional 10% off the discounted price, the effective discount is 28% — not 30%. The difference matters at scale: on 500 orders with an average original price of $80, the gap between 28% and 30% is $800 in revenue. Knowing the true effective discount lets you budget promotions accurately.