Unit Price Calculator
Compare two products on price, quantity and unit to see their real cost per 100g, per litre, or per item — useful for grocery shopping and spotting the better deal.
Product A
Product B
How this is calculated
We convert each product's quantity into a common base unit (grams for weight, millilitres for volume) so different pack sizes and units can be compared fairly, then scale to a friendlier display unit (per 100g or per litre).
Formula
Unit cost = price ÷ quantity (converted to a common base unit)Display cost = unit cost × 100 (per 100g) or × 1000 (per litre)Worked example
500g for $4 works out to $0.80 per 100g. A 1kg pack for $6 works out to $0.60 per 100g — the better per-unit value, even though it costs more upfront.
This calculator provides an estimate based on the numbers and assumptions you enter. It’s for general informational purposes and does not constitute financial, tax, legal, investment or credit advice. See our disclaimer and how we calculate pages for more detail.
Frequently asked questions
Yes — enter each product's own unit (g, kg, oz, lb for weight, or ml, L, fl oz for volume) and we'll convert them to a common basis automatically.