Price Per Unit Comparison Calculator
Compare two products by price per unit to find which one is the better deal.
About the Price Comparison Calculator
When two products come in different sizes and different prices, it is genuinely hard to tell which is the better value just by looking — this calculator computes the price per unit for both and tells you directly which option wins.
How It Works
The calculator divides each product's price by its quantity to get a price-per-unit figure for both, then compares the two directly and reports whichever option has the lower per-unit cost as the better deal.
Unit Price A = Price A / Quantity A; Unit Price B = Price B / Quantity B; Better Deal = whichever unit price is lower.
Worked example
Scenario: Product A: $7.98 for 32 oz. Product B: $4.49 for 16 oz.
- A: $7.98 ÷ 32 = $0.249 per oz.
- B: $4.49 ÷ 16 = $0.281 per oz.
- A is cheaper by about $0.03 per ounce (about 11%).
Result: Option A is the better deal per ounce.
Tips and common mistakes
- Only compare the same unit for both products.
- A lower unit price only saves money if you'll use it all before it expires.
- If the unit prices match, the calculator says so rather than picking one.
Assumptions & Limitations
- Assumes both products use the same unit of measurement (both in ounces, or both in count, for example) so the comparison is apples-to-apples.
- Assumes quality and usefulness per unit are otherwise equivalent between the two products.
- Does not account for quality differences, taste preference, or whether you'll actually use the full larger quantity before it expires or becomes less useful.
Compare products on the same basis
Unit price is most useful when package sizes differ. Divide price by quantity, then compare both products using the same unit. Promotions, multipacks and different unit sizes can otherwise make the cheaper-looking package more expensive per unit.
Example: $6 for 750 g is $0.008 per gram, while $7 for 1,000 g is $0.007 per gram, so the larger pack has the lower unit price.