Discount Calculator: Sale Price and Money Saved
Work out the sale price after a percentage discount, and see exactly how much the markdown saves you off the original price.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | You save | Sale price |
|---|---|---|
| 25% off $80 | 20 | 60 |
| 50% off $120 | 60 | 60 |
| 15% off $1,000 | 150 | 850 |
| 70% off $45 | 31.5 | 13.5 |
How This Calculator Works
Enter the original price and the discount percentage. The calculator multiplies the price by the discount to find the saving, then subtracts it from the original price to give the sale price — the amount you actually pay at the till.
The Formula
Percentage of an Amount
Amount is the base value, Percentage is the rate applied to it
Worked Example
An item priced at $80 with a 25% discount saves you $20. The sale price is $60. A larger discount lowers the sale price further, but the saving is always measured against the original, pre-discount price.
Key Insight
Two discounts do not simply add up. A 20% discount followed by a further 20% off is not 40% off — the second discount applies to the already-reduced price, giving 36% off in total.
Stacked discounts compound — 20% + 10% is not 30%
When discounts apply sequentially (a 20% off coupon plus a member 10% additional discount), they compound multiplicatively. The final price is original × (1 − 0.20) × (1 − 0.10) = original × 0.72, which is a 28% effective discount — not 30%. The arithmetic shortfall grows with the depth of the stack: a 30% + 20% stack is 44% off (not 50%); a 50% + 25% stack is 62.5% off (not 75%).
Order of application matters in some contexts. Most retailers apply the largest discount first; some apply membership tier discounts first, then promotional discounts on top. The mathematical result is the same regardless of order — multiplication is commutative — but rounding to whole cents at each step can produce 1-2 cent differences. For very-high-volume retail, these rounding effects accumulate to material annual numbers and accounting policy specifies the order explicitly.
Watch out for advertised 'up to' discounts. 'Up to 70% off' often means a small subset of inventory is at 70% off, while the typical item is at 20-30% off. Class-action settlements against retailers (Kohl's 2022, JCPenney 2015) found that 'reference prices' against which 'percent off' was calculated had been inflated to make headline discounts look more attractive. The FTC's Guides Against Deceptive Pricing govern this — a reference price should be one at which the retailer actually offered the product in good faith.
Reference pricing — when 'original price' is a fiction
The 'original' price against which a discount is calculated is one of the most regulated and litigated areas of retail advertising. The FTC requires that an 'original' or 'regular' price be a price at which the item was actually offered for sale to the public in good faith for a reasonably substantial period. State attorneys-general (California, New York, Massachusetts most active) enforce similar rules at the state level, often more strictly.
Persistent discounting violates this principle. If an item has been on 'sale' for 70% of the year, the sale price is the regular price and the headline 'original' price is a fiction. Notable enforcement actions: California AG v Kohl's (2022 settlement $19M for persistent reference-price inflation); New York AG v Macy's (multiple settlements over decades). Despite enforcement, the practice persists — savvy consumers should check price history via tools like Honey, CamelCamelCamel, or Keepa rather than trust headline percentage-off claims.
Outlet stores (Coach Outlet, Polo Outlet, Levi's Outlet) operate in a gray area. Many items sold at outlets were manufactured specifically for the outlet channel and never sold at the 'compare at' or 'MSRP' price. The compare-at price reflects what the equivalent product COULD have sold for at full retail, not what it actually did. Consumer-protection class actions have challenged this practice with mixed success — courts have generally accepted the practice if disclosure is adequate.
A discount and a markup of the same percent do not cancel — the asymmetry that traps shoppers
Intuition says a 30% markup followed by a 30% discount should return you to the starting price, but the math does not cooperate, because each percentage is taken against a different base. Mark a $100 item up 30% to $130, then take 30% off that $130, and you land at $91 — not $100. The discount is calculated on the inflated $130, so the 30% it removes ($39) is larger in dollars than the 30% the markup originally added ($30). The general rule: a markup of p% followed by a discount of p% always leaves you below the start, by a factor of (1 − p²/10000). The gap widens with the percentage — a 50% up-then-down lands at 75% of the original, a full quarter below where you began.
Retailers exploit the mirror image. To advertise a genuine '40% off' that still clears a target sale price, the 'original' price must be marked up more than 40% first — recovering a 40% discount needs a roughly 67% markup over the intended sale price, since 1 / (1 − 0.40) ≈ 1.67. That is the engine behind inflated 'compare at' tags: a deep-looking percentage off demands an even deeper markup on the reference price to protect margin. For a shopper, the defense is to ignore the percentage and judge the sale price on its own merits — what the item is worth to you, or what it has actually sold for historically — rather than letting the size of the discount stand in for the deal.
Discount math — effective discount of stacked promotions
Quick reference for the effective discount when multiple percentage discounts apply sequentially. The arithmetic sum overstates the true discount; compute multiplicatively.
| Discount A | Discount B | Sum (wrong) | Effective (multiplicative) |
|---|---|---|---|
| 10% | 10% | 20% | 19% |
| 20% | 10% | 30% | 28% |
| 20% | 20% | 40% | 36% |
| 30% | 20% | 50% | 44% |
| 40% | 20% | 60% | 52% |
| 50% | 20% | 70% | 60% |
| 50% | 25% | 75% | 62.5% |
| 50% | 50% | 100% | 75% |
For three or more stacked discounts, the same multiplicative principle applies: 1 − (1 − d1)(1 − d2)(1 − d3). Some loyalty / member discounts apply BEFORE promotional discounts, others AFTER — the final percentage is the same because multiplication is commutative, but cent-level rounding may differ.
Frequently Asked Questions
How do I calculate a discount?
Multiply the original price by the discount percentage and divide by 100 to find the saving, then subtract that from the original price to get the sale price.
Do stacked discounts add together?
No. A second discount applies to the already-reduced price, not the original. Two 20% discounts give 36% off in total, not 40%.
What is the difference between the saving and the sale price?
The saving is how much the discount takes off; the sale price is what you pay. The saving plus the sale price always equals the original price.
Does the discount apply before or after tax?
Discounts are normally applied to the pre-tax price, with sales tax then charged on the reduced amount. Enter the pre-tax price for an accurate sale price.
How do I find the percentage off from two prices?
Subtract the sale price from the original, divide by the original, and multiply by 100. That gives the discount as a percentage.
When is this calculator unreliable?
When discounts stack multiplicatively rather than additively (a 20% + 10% combo is 28% off, not 30%), when the 'original price' is an MSRP or 'compare at' price the retailer never charged (the discount is computed against an inflated base), or when sales tax / shipping interactions differ across states. For high-value purchases, check actual price history via Honey, CamelCamelCamel or Keepa rather than relying on percent-off claims.
References & Authoritative Sources
- U.S. Federal Trade Commission (FTC) — Guides Against Deceptive Pricing — Reference Pricing · consulted June 1, 2026 · Federal guidance on what counts as a legitimate 'original' or 'reference' price for advertising discounts
- Investopedia — Discount — Discount: Definition, Types, and Examples · consulted June 1, 2026 · Standard reference for retail and financial discount concepts
- Consumer Reports — How to Tell If a Sale Is Actually a Sale · consulted June 1, 2026 · Consumer guidance on identifying misleading reference prices in retail advertising
Related Calculators
Data Sources & Benchmarks
This calculator draws on 1 independent, dated source.
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Methodology & Review
The discount calculator returns the dollar amount saved and the final price after a percentage discount. The formula is: discount amount = original price × discount % / 100, and final price = original price − discount amount. For stacked discounts (e.g., 20% off, then an additional 10% off the reduced price), discounts compound multiplicatively, not additively: a 20% + 10% stack is actually 28% off (1 − 0.8 × 0.9), not 30%. The calculator handles single-step percentage discounts; for stacked promotions, apply each step in sequence. Sales tax is computed on the post-discount price in most U.S. states (the discount reduces the taxable amount), but a small minority of states tax the pre-discount amount on coupon redemptions — confirm with your state's department of revenue. RELIABILITY: Reliable for simple single-step percentage discounts at the listed retail price. Less reliable when discounts stack multiplicatively, when the 'original price' is a manufacturer-suggested retail price (MSRP) that retailers never charge (the discount is computed against an inflated base), or when tax / shipping interactions matter (some retailers tax pre-discount; most tax post-discount).
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