Compare two products by price per unit to find the better value.
Calculated locally in your browser.
How do you calculate unit price to compare products?
Unit price = price ÷ quantity, and the lower unit price is the better value. This makes comparing pack sizes exact, since bigger packs are often, but not always, cheaper per unit. For example, $3.50 for 500 g is $0.007/g while $5.00 for 1000 g is $0.005/g — so the larger pack is cheaper per gram.
Understanding your result
Bigger packs are often, but not always, cheaper per unit. This makes the comparison exact.
Formula and method
Unit price = price ÷ quantity. The lower unit price is the better value.
Assumptions and limitations
This tool divides price by quantity to compare two items on a like-for-like basis, so both must be entered in the same unit of measure. It does not account for quality, freshness, whether you will use a larger pack before it spoils, or delivery charges. Use it as one input alongside your own judgement.
Worked example
$3.50 for 500 g is $0.007/g; $5.00 for 1000 g is $0.005/g — so the larger pack is cheaper per gram.
How to use this tool
- Enter the price and quantity for each item.
- Use the same unit (g, ml, items) for both.
- See which has the lower unit price.
Common mistakes to avoid
- Comparing different units — convert both to the same unit first.
About the Unit Price Comparison
Work out which of two products is better value by comparing their price per unit, even when the pack sizes differ.
Who should use this tool
Shoppers comparing pack sizes and deals at the supermarket.
Benefits
- Reveals the true cost per unit even when pack sizes differ between two products
- Runs entirely in your browser, so nothing you type is sent anywhere
- Removes guesswork from comparing multi-buys against single items
- Gives an exact figure rather than an at-a-glance impression of value
Practical use cases
- Deciding between a small and a large pack of the same product while shopping
- Comparing a multi-buy offer against buying single items separately
- Checking whether a bulk pack genuinely costs less per unit than a smaller one
- Working out the better value when two brands use different pack sizes
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Frequently asked questions
Can I compare different units?
Use the same unit for both items (for example grams) so the comparison is fair.
Is bigger always cheaper?
No. Sometimes a smaller pack or a promotion is better value — this tool tells you for sure.
Do both products need to use the same unit?
Yes. The comparison is only valid when both prices are measured against the same unit, such as grams, millilitres or a single item. If one pack is priced by weight and the other by count, convert them to a common unit first, then compare the results.