Final price
$4.79
You save
$1.20
Quick answer: For a percentage discount, multiply the original price by one minus the discount rate. Apply stacked discounts one after another because percentages compound instead of adding directly.
Make your grocery budget go further
Before choosing a package or sale offer, use the Unit Price Calculator to compare price per pound, ounce, or item. Then use the Servings & Leftover Portion Calculator to plan meals from food you already have.
Evergreen method
Measure savings against a clean baseline
A saving is the difference between comparable baskets, not a coupon total or an advertised percentage.
Formula
savings rate = (baseline cost − new cost) ÷ baseline cost × 100Reproducible steps
- 1.Compare the same quantities and quality level.
- 2.Include fees, membership costs and unused products.
- 3.Annualize only after several representative shopping cycles.
Data note — Evergreen model: The formula works with your own inputs and does not depend on a specific price or year.
FAQ
Questions, answered
How do you calculate the final price after a discount?
Multiply the original price by (1 minus the discount as a decimal). A 20% discount on $4.99 gives a final price of $3.99.
If something is 20% off and then another 10% off, is that 30% off?
No - stacked percentage discounts multiply, not add. 20% off then 10% off equals 28% off total, not 30%, because the second discount applies to the already-reduced price.
Is buy one get one 50% off actually a good deal?
It works out to 25% off both items combined - use this calculator to check the real total against a straight percentage-off deal on the same items.
Related
Keep going
Grocery Savings Calculator
Free grocery savings calculator: see how much coupons, sales, store brands, and meal planning save you each month - and what it adds up to per year.
Grocery Cashback Calculator
Free grocery cash back calculator: estimate your yearly earnings from supermarket credit cards, Ibotta, and receipt apps - solo or stacked.
Grocery Coupon Stacking Calculator
Combine a sale price, dollar coupons, percent discounts, and cash back to see your true final grocery price.
BOGO Deal Calculator
Calculate the real discount, final total, and effective item price for buy-one-get-one and mix-and-match offers.
How to Save Money at the Grocery Store
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Read guideAre Grocery Store Sales Actually a Good Deal?
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