Finance

Discount Calculator — Percent Off & Stacked Deals

Enter any original price and one or two discount percentages. Get the exact final price, how much you save, and the real combined rate when two discounts stack (it's never the simple sum).

U.S. Federal Trade Commission data · June 2026
Edited by Martín Rodríguez
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Edited by: Martín Rodríguez (editorial policy )

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A 20% + 10% sticker doesn't mean 30% off — the second discount applies to the already-reduced price, so the real saving is 28%. Enter your price and one or two percentages; this calculator gives the exact final price, dollar savings, and the true combined rate instantly.

When to use this calculator

Finding the final price after a single percent-off sale
Calculating the real rate when a coupon stacks on top of a sale price
Comparing '30% off' vs '20% + extra 10%' deals at checkout
Checking how much you save before buying on Black Friday or Cyber Monday
Setting a sale price as a retailer to protect your margin
Verifying a clearance rack tag price against the original ticket

Final price after discount

Final = price × (1 − discount%). Stacked discounts multiply, they don't add (20% then 10% = 28% off, not 30%).

Original	10% off	20% off	30% off	50% off
$20	$18.00	$16.00	$14.00	$10.00
$50	$45.00	$40.00	$35.00	$25.00
$100	$90.00	$80.00	$70.00	$50.00
$250	$225.00	$200.00	$175.00	$125.00

How it works

How to Calculate a Percent Discount

The formula is: Final Price = Original Price × (1 − discount / 100). Savings = Original Price − Final Price.

Original Price	Discount	Final Price	You Save
$50	10%	$45.00	$5.00
$100	20%	$80.00	$20.00
$100	25%	$75.00	$25.00
$200	30%	$140.00	$60.00
$300	40%	$180.00	$120.00
$500	50%	$250.00	$250.00
$80	15%	$68.00	$12.00
$120	33%	$80.40	$39.60

How Stacked Discounts Work

When two discounts apply one after the other, each is computed on the new lower base — they do not simply add:

factor      = (1 - d1/100) × (1 - d2/100)
finalPrice  = originalPrice × factor
savings     = originalPrice - finalPrice
realPercent = savings / originalPrice × 100

Combined rate shortcut: d1 + d2 − (d1 × d2) / 100
For 20% and 10%: 20 + 10 − (20 × 10)/100 = 30 − 2 = 28%.

Common Stacked Discount Examples

First Discount	Second Discount	Combined Real Rate
10%	10%	19%
20%	10%	28%
25%	15%	36.25%
30%	20%	44%
50%	50%	75%
20%	20%	36%
15%	5%	19.25%

Worked Example — Stacked Discounts

$120 item: 25% sale, then extra 15% coupon

Step	Calculation	Result
After 25% off	$120 × 0.75	$90.00
After 15% coupon	$90 × 0.85	$76.50
Savings	$120 − $76.50	$43.50
Real discount	43.50 / 120 × 100	36.25% (not 40%)

Does Order Matter?

For two percentage discounts: no. 20% then 10% gives the same final price as 10% then 20% (multiplication is commutative). Order only matters when mixing a percentage discount with a fixed-dollar coupon.

What This Calculator Does Not Cover

Sales tax — applied after discounts at checkout; this shows the pre-tax final price.

Buy One Get One (BOGO) — treat as 50% off one item's price if needed.

Fixed-dollar coupons — subtract the coupon first, then apply the percentage discount.

Example: $120 item, 25% sale plus an extra 15% coupon

Apply the first discount: $120 × (1 − 0.25) = $90.00

Stack the second on the lower base: $90 × (1 − 0.15) = $76.50

Real combined rate: $43.50 saved ÷ $120 = 36.3% (not 40%)

Final price is $76.50 — you save $43.50, a real 36.3% discount because stacked percentages multiply. Pre-tax figures.

Disclaimer: Informational estimate. Actual rates, fees, and terms depend on the provider and contract; compare official documents before deciding.

Frequently asked questions

How do I calculate percent off?

Multiply the original price by (1 − discount/100). For 25% off $80: $80 × 0.75 = $60. Savings = $80 − $60 = $20. This calculator handles it instantly.

Is 20% + 10% the same as 30% off?

No. The second discount applies to the price already reduced by the first. The real combined rate is 28%, not 30%. The formula: d1 + d2 − (d1×d2)/100 = 20 + 10 − 2 = 28%.

What is 30% off $100?

$100 × (1 − 0.30) = $70. You save $30. For other amounts at 30% off: $50 → $35; $200 → $140; $250 → $175; $500 → $350.

How do I find the original price from the sale price?

Divide the sale price by (1 − discount/100). If an item sells for $63 after a 30% discount, the original was $63 ÷ 0.70 = $90.

Does the order of two stacked discounts change the final price?

Not for two percentage discounts — multiplication is commutative, so 20% then 10% gives the same result as 10% then 20%. Order does matter if one coupon is a fixed dollar amount.

What is a 50% discount on $120?

$120 × 0.50 = $60. You pay $60 and save $60. Stack an additional 10% and you pay $54 (a real 55% combined discount).

How do I calculate three stacked discounts?

Multiply all (1 − rate) factors together. For 20%, 10%, and 5%: 0.80 × 0.90 × 0.95 = 0.684, so you pay 68.4% of the original — a real 31.6% combined discount. Run the calculator twice to chain three.

Should the discount be applied before or after tax?

Discounts apply to the pre-tax price; sales tax is then calculated on the discounted amount. A bigger discount slightly lowers the tax too. This calculator shows the pre-tax final price.

What is 15% off $200?

$200 × 0.85 = $170. You save $30. Common reference: 10% of any price is just move the decimal (10% of $200 = $20), then 15% = $20 + $10 = $30 off.

How do retailers use discount math?

To hit a target final price: discount % = (1 − targetPrice/originalPrice) × 100. Knowing stacked discounts compound helps avoid giving away more margin than intended when combining a sale with a promo code.

Sources & references

Federal Trade Commission — Guides Against Deceptive Pricing (16 CFR Part 233) — U.S. Federal Trade Commission (2026)
Khan Academy — Percent word problems — Khan Academy (2026)
National Institute of Standards and Technology — Handbook 130: Uniform Pricing — NIST (2021)

Methodology & trust

Editorial

Finance calculator with its formula verified automatically against Federal Trade Commission — Guides Against Deceptive Pricing (16 CFR Part 233), per our editorial policy and methodology.

Updates

Updated: June 2026. Parameters are verified periodically against the cited sources.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). Discount Calculator — Percent Off & Stacked Deals. Hacé Cuentas. https://hacecuentas.com/en/discount-calculator

Content licensed under CC-BY 4.0 — reuse it citing the source with a link to Hacé Cuentas.

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