Discount Calculator: Multiple Discounts & Tax

Calculate a sale price with up to three successive percentage discounts. See savings before tax, the effective combined discount, and a final total with optional tax applied to the discounted subtotal. All amounts are in US dollars.

Calculate discounts and final price

Enter percentages such as 20 for 20%. Each additional discount applies to the remaining price, not the original price. Optional blanks are ignored. Tax, if entered, applies after all discounts.

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How to calculate a discounted price

Price after discount = original price x (1 - discount percentage / 100)

For $100 with 20% off, $100 x 0.80 = $80. Savings are $20 before tax.

For step-by-step examples, read our guide to calculating discounts, savings, and tax.

Double discounts: 20% then 10% is 28% off

The second discount applies to the reduced price. Starting with $100, 20% off leaves $80. Taking another 10% off $80 saves $8, leaving $72. Combined savings are $28, or 28%, not 30%.

Combined discount = 1 - (1 - rate 1) x (1 - rate 2), with rates expressed as decimals. For a third discount, multiply by one more remaining-price factor.

Discount calculator with tax

This tool applies your entered tax percentage to the final discounted subtotal. With a $72 subtotal and 8% tax, the tax is $5.76 and the final total is $77.76.

The tool does not look up tax rates or decide the legal tax treatment of coupons, rebates, products, or locations. Some tax rules may use a different taxable amount. Check the applicable rules and the seller's receipt.

Triple discount example

Starting at $100, successive discounts of 20%, 10%, and 5% give $100 x 0.80 x 0.90 x 0.95 = $68.40 before tax. The rate-based combined discount is 31.6%, rather than the sum of 35%.

Frequently asked questions

Can I add discount percentages together?

Not for successive discounts on the remaining price. Add them only if the promotion explicitly defines a single combined rate that way. This calculator models successive discounts.

Can I enter a fixed-dollar coupon?

No. This version accepts percentage discounts only. Fixed-dollar coupons, rebates, shipping fees, and minimum-purchase rules require separate calculations.

Does the order of discounts matter?

Without rounding, multiplying the same percentage factors gives the same final amount in any order. With per-step cent rounding, the order can affect small amounts. Enter the order used by the seller.

Why is a combined percentage different from savings on a small price?

The combined rate is calculated from the discount percentages without cent rounding. Actual displayed savings follow the per-step cent rounding used here, which can change tiny amounts.

Can I leave tax blank?

Yes. No tax amount is added, and the result says it was not entered. This does not mean the purchase is tax-exempt.

What inputs are supported?

Original price from $0 to $10,000,000, discount and tax percentages from 0% to 100%, all with up to two decimal places. Use a decimal point or comma without thousands separators. Original price and first discount are required; additional discounts and tax are optional. Enter 0 for a zero first discount.

Related business calculator

If you are calculating earnings on sales rather than a price reduction, use the Sales Commission Calculator.

HandyMetric provides general calculation aids, not tax advice or a seller's final checkout quote. Confirm promotion terms, applicable taxes, and receipt rounding.