Sale price in one pass: percent off, a fixed amount off, a stacked extra discount, and sales tax — final price, every deduction, and the total savings shown.
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FORMULA USEDDiscount Calculator
What a discount calculator does
Percent-off arithmetic is easy to get wrong under pressure: a sticker price, a percent cut, maybe a coupon, maybe a second cut, and finally tax. This tool applies the steps in register order — percent off first, then any fixed dollar amount, then a stacked extra percent, and sales tax last on the discounted price — and shows every subtraction along the way.
The formula
The core is sale price = original × (1 − percent/100), and the amount saved is the difference. A fixed coupon subtracts dollars afterward; a stacked second discount multiplies what remains again; tax multiplies the final discounted price by (1 + rate/100).
Tax before or after the discount
In nearly all US states, sales tax is charged on the price you actually pay after store discounts, which is why tax is applied last here. Manufacturer coupons occasionally behave differently — a few states treat them like payment after tax. When a receipt looks off by a dollar, check which line the tax was computed on.
Worked example
A $120 jacket: 25% off, a $10 coupon, 8% sales tax.
You saved $40.00 before tax and paid $86.40 all-in.
How to use it
Enter the original sticker price.
Enter percent off, any fixed coupon amount, and a stacked extra discount if you have one.
Add sales tax last — it applies to the discounted price.
Read each deduction in the rows and the total saved under the total.
Frequently asked questions
What is the discount formula?
Sale price = original × (1 − percent/100), and amount saved = original − sale price. When several cuts stack, apply them in order — percent, then fixed dollars, then any extra percent — and apply tax to the result.
How do I calculate 10% off?
Find ten percent of the price and subtract it, or just multiply by 0.9. Ten percent of $85 is $8.50, so the sale price is $76.50.
How do I find the original price from a sale price?
Divide the sale price by (1 − discount rate). An item marked 25% off selling for $60 came from 60 ÷ 0.75 = $80. That is the reverse of the forward calculation — not a percentage addition on top.
Does sales tax apply before or after the discount?
After, in almost every US jurisdiction: tax is charged on what you actually pay. This calculator applies tax to the fully discounted price, matching how registers ring up store discounts.
Why is 20% off plus another 20% off not 40% off?
Because the second discount applies to the already-reduced amount: 0.8 × 0.8 = 0.64, so two stacked 20% cuts remove 36% of the original, not 40%. Percentages multiply what remains; they do not add.