Free Discount Calculator
Calculate the sale price and total savings from any original price and discount percentage. Find the discount percentage from two prices, or compare stacked discounts. Free, private — all calculations run in your browser.
You save $20.00 out of $100.00 — that's 20.00% back in your pocket.
About This Discount Calculator
This Discount Calculator solves the three core retail pricing questions instantly: What is the sale price after a percentage discount? What percentage discount does a price reduction represent? And how much do I actually save in dollars and as a percentage? Whether you are shopping in-store, comparing online deals, or setting promotional prices for your business, this tool gives you precise answers in seconds.
The Formula — How It Works
The calculator uses three standard retail discount formulas:
Sale Price = Original Price − Discount Amount
Savings % = (Discount Amount ÷ Original Price) × 100
To find the discount percentage when you know both prices: Discount% = ((Original − Sale) ÷ Original) × 100. To find the original price from a sale price and discount%: Original = Sale Price ÷ (1 − Discount% ÷ 100).
Understanding Double and Stacked Discounts
A common misconception is that two sequential discounts add together. They do not — they compound multiplicatively. A 20% discount followed by an additional 10% discount is not 30% off the original price. The second discount applies to the already-reduced price. The true combined discount is: 1 − (1 − 0.20) × (1 − 0.10) = 1 − 0.72 = 28% off. This distinction matters enormously in retail promotions and coupon stacking scenarios.
Who Should Use This Calculator
This tool is for everyday shoppers who want to verify the real savings on a sale, deal hunters comparing promotional offers across multiple stores, small business owners setting promotional pricing and needing to know the exact impact on revenue, and anyone who encounters percentage-based pricing and wants a precise answer without mental arithmetic. It is particularly valuable during high-pressure shopping events like Black Friday, where multiple overlapping discounts can be confusing.
Privacy Notice
All calculations in this discount calculator are performed entirely in your browser. No price data or inputs you enter are transmitted to any server, stored in any database, or shared with third parties. See our Privacy Policy for full details.
When to Use This Calculator
Instantly calculate the final price and total savings during sales, clearance, or seasonal events without doing mental math in the store aisle.
Compare the real cost of an item at different retailers after their respective discounts, even when each store expresses the deal differently (% off vs. $ off).
Decide whether a bulk quantity discount (e.g., 15% off for buying 10 units) is worth the higher upfront cost compared to buying fewer units at full price.
Calculate the exact margin impact of promotional discounts on your products — see the sale price, revenue per unit, and total discount given at different discount levels.
Track savings across multiple discounted items during holiday shopping to stay within budget and calculate how much you are actually saving versus the original total.
💡 Pro Tips
For grocery and household goods, calculate price-per-unit or price-per-ounce — not just total price. A larger package with a smaller discount often beats a smaller package with a bigger discount. Divide the sale price by the quantity or weight to get the real comparison number. Most grocery stores print unit price on the shelf tag, but calculating it yourself is more reliable.
A percentage discount and a dollar discount feel different but mean the same thing in context. "20% off" on a $50 item = $10 off. "$15 off" on the same $50 item = 30% off. Always convert to the same format when comparing two offers. The higher percentage off the original price is always the better deal for a single item.
BOGO (Buy One Get One Free) is exactly 50% off per item when buying two of equal price. But BOGO 50% off (second item at half price) is only 25% off the total purchase. When comparing BOGO to a flat percentage discount, calculate total cost for two units: 50% off two units vs. BOGO 50% (pay 1.5× for 2 units). The flat 50% discount wins every time for pairs.
Always verify that the "original price" is genuine. Some retailers mark up prices before sales events to create an artificially large discount. Use price-tracking browser extensions (like Honey or CamelCamelCamel for Amazon) to check historical prices before assuming a sale is a real deal. A 50%-off label means nothing if the item was inflated 60% beforehand.
Frequently Asked Questions
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