Discount Calculator
Calculate sale prices, savings amounts, and original prices from any discount percentage.
What is Discount Calculator?
Discount calculations come up constantly in business and everyday life: calculating a sale price from a percentage off, figuring out what percentage discount a sale price represents, working backwards to find the original price from a sale price, or calculating the true cost when multiple discounts are stacked. While the maths is simple in isolation, combining multiple discounts (20% off, then an additional 10% off) produces counterintuitive results — a 20% + 10% discount is not 30% off, it is 28% off (you save 20% first, then 10% of the remaining 80%). For businesses, discount strategy directly affects margins: a 20% discount on a product with a 40% margin reduces the margin to 20% — half of the original. Understanding the full impact of discounting is essential for pricing strategy, promotions planning, and maintaining profitability. This calculator handles all discount scenarios instantly.
How to Use Discount Calculator
- 1
Enter Original Price and Discount
Input the original price and the discount percentage. Or input the original and sale price to calculate what percentage discount that represents.
- 2
Add Stacked Discounts (Optional)
Add a second or third discount if multiple promotions apply (e.g. 20% seasonal sale + 10% loyalty discount). The tool correctly calculates compounded discounts, not simple addition.
- 3
View Full Breakdown
See the sale price, total savings, effective discount percentage (for stacked discounts), and savings as a percentage of the original price — with margin impact if you enter your cost price.
Use Cases
Retail and E-Commerce Promotions
Before running a sale, calculate the exact impact on your margin at different discount levels. A product costing $40 selling at $100 has a 60% gross margin. At 30% off ($70 sale price), margin drops to 43%. At 50% off ($50), margin collapses to 20%. Knowing these thresholds prevents promotional pricing that meets revenue targets while destroying profitability.
Negotiating Supplier Discounts
When negotiating volume discounts with suppliers, calculate the true savings at different discount tiers. A 5% discount on $50,000 annual spend saves $2,500 — worth pushing for, but perhaps less valuable than a free delivery concession that saves $3,000/year in shipping costs.
Shopping and Price Comparison
Compare sale prices across retailers by calculating the true discount percentage from original and sale prices. A product marked "was $199, now $149" is a 25.1% discount. A competing product "was $179, now $129" is a 27.9% discount — the second deal is actually better despite the higher price.
Features
Three Calculation Modes
Calculate sale price from discount %, discount % from original and sale price, or original price from sale price and discount % — covering all common discount calculation scenarios.
Stacked Discount Calculator
Correctly calculates the result of applying multiple sequential discounts (e.g. 30% off then an extra 15% off) — showing both the compounded discount and the true effective percentage saved.
Margin Impact Analysis
Enter your cost price alongside the selling price to see how the discount affects your gross margin — preventing the common mistake of running promotions that accidentally reduce margins to zero.
Bulk Discount Table
Generates a table of sale prices for multiple discount percentages at once (10%, 15%, 20%, 25%, 30%) — useful for planning tiered discount structures or loyalty programmes.
Frequently Asked Questions
No — and this is the most common discount misconception. Stacked discounts compound, not add. 20% off a $100 item = $80. Then 10% off $80 = $72. Total saving: $28, or 28% off — not 30%. The effective discount of stacked percentages is always less than their sum. Formula: Effective discount = 1 - (1-d1) × (1-d2) × ... where d1, d2 are decimal discounts. For 20% and 10%: 1 - 0.8 × 0.9 = 1 - 0.72 = 28%. This is why retailers often advertise "extra 10% off" in addition to a sale — the combined saving sounds like more than it is.
Formula: Original Price = Sale Price / (1 - Discount%). Example: An item is on sale for $75 with 25% off. Original price = $75 / (1 - 0.25) = $75 / 0.75 = $100. This reverse calculation is useful when you know the sale price and discount percentage but need the pre-discount original price — common when comparing retailers who display different information.
A discount is a reduction from the original selling price for a specific reason (promotional, volume, loyalty) — it is typically temporary. A markdown is a permanent reduction in selling price, often used to clear old inventory, end-of-line products, or slow-moving stock. In accounting, markdowns are recorded differently from discounts because they represent a permanent change to the product's retail value rather than a promotional adjustment.
Discounting has an outsized effect on profit margins because you are cutting into the margin, not the revenue. Example: Product selling at $100 with $60 cost (40% gross margin). A 10% discount reduces revenue to $90, but cost stays at $60. New margin: ($90-$60)/$90 = 33.3%. A 10% revenue reduction caused a 16.7% margin reduction. At 30% off ($70 sale price): margin = ($70-$60)/$70 = 14.3% — a 64% reduction in margin from a 30% price cut. Always calculate margin impact before approving discounts.
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