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How to use
Compare two products by reducing each package to a cost for one unit of quantity. This avoids confusing the lower sticker price with the better value when package sizes differ, as long as both quantities represent the same kind of unit.
- Enter Product A price and quantity.
- Enter Product B using the same kind of quantity unit.
- Calculate to compare both unit prices, the lower-cost option and the relative difference.
How it is calculated
Example
Example: a 12.99 pack of 24 costs 0.54125 per item; an 8.50 pack of 15 costs about 0.56667. Product A has the lower unit price. Product B costs about 4.70% more than A when the gap is divided by A's lower price. Expressed as savings relative to B's price, A costs about 4.49% less.
Important notes
Compare like with like: do not compare 500 g directly with 1 liter without an appropriate conversion, and do not assume lower unit cost means higher quality. Enter the actual final price if a discount or fee should be included. The calculator is currency-neutral.
Worked examples and interpreting results
A pack costing 12 for 3 units and another costing 15 for 5 cost 4 and 3 per unit. The cheaper pack total is not necessarily the lower unit price.
| Case | Calculation | Result |
|---|---|---|
| First product unit price | 12 ÷ 3 | 4 |
| Second product unit price | 15 ÷ 5 | 3 |
How to check the result
Use the same quantity unit for both products, such as kilograms or item count. Convert differing quantity units before comparing.
Frequently asked questions
Do the package sizes need to match?
No. Different sizes are the point, but quantities must describe the same unit or first be converted to a common basis.
What if the unit prices are identical?
The calculator reports the same unit price and a 0% relative difference.
Can I use kilograms or liters?
Yes, provided both quantities use the same unit. Convert mixed units first.