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About this tool
Calculate sales savings. Tweak discount rates, stacked discounts (e.g. 20% + 10%), tax additions, and view dynamic financial breakdowns.
The Discount Calculator works out what a marked-down item actually costs by applying each discount in sequence — the second discount is taken off the already-reduced price, not added to the first — and then adding sales tax to the discounted subtotal. Enter the original price, a discount rate, an optional stacked second discount and a tax rate up to 25%, and it returns the final price, total saved and tax amount together with a bar showing what share of the original price each part represents. It is built for shoppers and retail staff who need to check a till total or a coupon claim before paying.
Open Discount Calculator on AltFTool — it loads instantly in your browser.
Type the ticket price into Original Item Price and drag the Discount Rate slider between 0 and 100%.
Tick 'Add Secondary Stacked Discount' to reveal the Secondary Discount Rate slider, and set Sales Tax Rate anywhere from 0 to 25%.
Read Final Price Paid, Total Discount Savings and Sales Tax Amount, with the Price Breakdown Proportions bar splitting paid, saved and tax.
The second discount is applied to the post-first-discount price, matching how retailers actually compound coupons instead of summing the percentages.
Sales tax is charged on the discounted subtotal, so the total matches a real receipt rather than taxing the pre-discount price.
A single bar splits the original price into what you pay, what you save and what goes to tax, so the size of the deal is visible at a glance.
No — it comes to 28% off. The extra 10% is taken from the price after the first discount, so $100 becomes $80, then 10% of $80 is $8 off, leaving $72. The calculator applies stacked discounts in this sequential order by default.
Multiply the original price by (100 minus the discount percentage) divided by 100 — a $50 item at 30% off is 50 × 0.70 = $35. For a second stacked discount, repeat the same step on that result rather than adding the two rates together.
After. In practice tax is calculated on the discounted subtotal, which is what this tool does: it discounts first, then applies the tax rate you set (anything from 0% up to 25%) to the reduced amount.
Yes — divide the amount saved by the original price and multiply by 100. If a $120 item now sells for $90, the saving is $30, and 30 ÷ 120 × 100 gives 25% off. Adjusting the discount slider until the final price matches gives you the same answer.
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