Unit Price Calculator

Compare two or three products by price per unit (per kg, per 100 g, per litre, per item) and instantly see which is the better deal and by how much.

ItemPriceQuantityUnit
Item 1
Item 2
Item 3

How unit-price comparison works

Unit price = price ÷ quantity (normalized to kg, litre or item)

Grams are converted to kilograms and millilitres to litres before dividing, so packages of any size compare directly. Per-item pricing is kept separate — a price per egg can't meaningfully be compared with a price per kilo.

Worked example

Coffee A: 250 g for 2.50 → 10.00 per kg. Coffee B: 1 kg for 9.00 → 9.00 per kg. The big pack wins — Coffee A costs about 11% more per kilogram.

Shopping tips

Frequently asked questions

What is a unit price?
The cost per standard amount — per kilogram, per litre or per item — rather than per package. Dividing price by quantity puts different package sizes on an equal footing so you can see which is actually cheaper.
Is the bigger package always the better deal?
Usually but not always — retailers know shoppers assume this, and "bulk" sizes are sometimes priced higher per unit than the mid-size. That’s exactly what a unit-price check catches.
How do I compare items sold in grams with items sold in kilograms?
Pick the matching unit for each item in this calculator and it normalizes them automatically — 250 g at 2.50 is 10.00 per kg, directly comparable with a 1 kg pack at 9.00.
Can I compare weight-based and volume-based products?
Only if they’re really the same thing (and even then density matters). This calculator deliberately refuses to compare weight with volume or with per-item pricing, because those unit prices aren’t comparable.

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