One product
Normalize a pack price to a useful shopping unit.
- Price is the total offer price. Use the same currency throughout.
Shopping & Household calculator
Unit Price & Offers
Compare equivalent quantities across pack sizes, bulk purchases and multibuy offers without mixing incompatible units.
Method and practical checks
- Price is the total offer price. Use the same currency throughout.
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Every calculation option
Compare products
Compare two offers on the same mass, volume or item basis.
- Bulk and multibuy offers use the total price and number of identical items in that offer.
- Mass cannot be compared with volume without a product-specific density; this tool rejects that comparison.
- A lower unit price saves money only if you use the quantity purchased.
Worked example
500 g for 3.00 is 6.00 per kg (0.60 per 100 g). 750 g for 4.65 is 6.20 per kg. The smaller pack is cheaper by 0.20 per kg, a saving of about 3.2%, and buying 500 g of the larger product would cost 3.10.
| Input | Value |
|---|---|
| Price | 3 |
| Quantity per item | 500 |
| Unit | g |
| Items in offer | 1 |
| Result | Value |
|---|---|
| Product A unit price | 6 / kg |
| Product A price per 100 g | 0.6 |
Reading the result
- A lower unit price only saves money if you use the extra quantity before it spoils or you lose interest.
- Mass and volume cannot be compared without the product’s density, so the calculator rejects that comparison.
- For multibuy offers, enter the total price and the number of identical items in the offer.
Sources and further reading
- NIST Guide to the SI, Appendix B.8 (conversion factors) — Exact yard, pound and ounce factors and the US cup (236.5882 mL).