How to compare pack prices using the same unit
DailyUseKit · Updated 4 October 2026
Look beyond the price on the pack
A smaller pack can have a lower checkout price and a higher cost per kilogram. Unit price lets you compare quantities fairly. It does not decide quality, convenience or whether you can use the whole pack.
Convert quantities first
For weight, 1 kilogram equals 1,000 grams. For volume, 1 litre equals 1,000 millilitres. Convert both quantities to one unit before entering them. For items counted individually, compare pieces with pieces. Do not compare kilograms with litres unless you have a valid product-specific conversion.
Example: 500 g versus 1 kg
Pack A costs 45 for 500 g. Enter 0.5 as its quantity if you are using kilograms. Pack B costs 80 for 1 kg. Pack A costs 90 per kg; Pack B costs 80 per kg. Pack B is about 11.11% cheaper per kg, calculated as (90 − 80) ÷ 90 × 100.
Include relevant extra costs
If one option requires a delivery fee, add the fee to its pack price when the entire fee relates to that purchase. If you buy several products together, allocate the fee consistently. Compare the same product type and condition; a concentrated product may not be equivalent to a diluted one.
A bigger pack is not always a better purchase
If you only use half of a large pack before it spoils, its advertised unit-price saving can disappear. Consider storage, available cash and likely consumption. The calculator reports price per entered unit and percentage savings, not a recommendation to spend more or borrow to buy in bulk.