Unit Price Calculator - Compare Price per kg, lb, Litre or Ounce
Unit Price Calculator
Which pack size is really the best deal
Mixed Units
Compare a 500 g bag with a 1 kg bag and a 12 oz box in one go.
Multipacks
Enter how many come in a pack to compare six-packs with single bottles.
How Much More
See how much more each option costs per unit than the cheapest.
Private
Calculated in your browser.
Bigger Is Not Always Cheaper
The unit price is the price divided by the amount, converted to a common unit. Shops often show it on the shelf label, but in different units for different products. Example: 500 g for 3.49 is 6.98 per kg, 1 kg for 5.99 is 5.99 per kg, and 12 oz (340 g) for 2.29 is 6.73 per kg, so the 1 kg bag is cheapest, and the 500 g bag costs 16.5% more per kilo.
Bulk packs usually win, but not always: promotions on small sizes can beat them, and a big pack only saves money if you use it before it goes off. Fluid ounces and gallons here are US measures. Weight and volume cannot be compared directly, since that would need the product's density.
Key Takeaways
- Same family: Compare weight with weight and volume with volume.
- Check the shelf label: Shelf unit prices can use different units side by side.
- Any currency: Prices are plain numbers, so use your own currency.