Small and large bags
A 500 g bag at 4.80 costs 9.60 per kg. A 1 kg bag at 8.70 costs 8.70 per kg, so it has the lower unit price among those inputs.
Compare package sizes and multipacks
Compare compatible units only. Price covers all entered packs; quantity is measured per pack. Mass and volume do not convert without density. All prices must use one currency.
Cost per kg
| Package | Total quantity | Price / kg | Compared with lowest |
|---|---|---|---|
| Small bag | 0.5 kg | $9.6000 | 10.34% more |
| Large bag | 1 kg | $8.7000 | Lowest unit price |
| Three-pack | 1.2 kg | $10.0000 | 14.94% more |
Unit prices display four decimal places. Compare quality, waste and usable quantity separately; a lower unit price can still mean a larger total purchase.
Calculations run in your browser. Inputs are not uploaded or saved by this calculator.
How to use the Unit Price Calculator
- 01
Choose a common display unit and enter each package’s total purchase price.
- 02
Enter the quantity in one pack, its unit, and the number of packs included in that total price. Add or remove packages as needed.
- 03
Compare cost per common unit. The lowest badge uses unrounded calculations, while displayed prices show four decimal places.
Examples
Multipack quantity
Three packs of 400 g contain 1.2 kg total. If the total purchase price is 12.00, the unit price is 10.00 per kg. Enter 12.00 as price and 3 as pack count, rather than multiplying the price again.
Use the same measurement basis
Price per unit equals total price divided by total quantity in the display unit. Total quantity includes the pack count. Grams, kilograms, mass ounces and pounds are compatible; milliliters and liters form a separate volume group. Individual items form a count group.
Lowest unit price is one part of value
A larger pack can have a lower unit price while requiring a larger purchase. Compare usable quantity, quality, waste, storage and product concentration separately. The percentage premium compares each unit price with the lowest entered value and is undefined when the lowest option is free.
What to know
- Compare 2 to 12 options. Pack counts must be positive whole numbers.
- This is a consumer comparison aid, not a retail labeling compliance assessment.
Common questions
Can I compare grams with milliliters?
No. Mass-to-volume conversion requires product density, which is not supplied by this tool.
Does oz mean fluid ounces?
No. Here oz is an avoirdupois mass ounce, and lb is the corresponding mass pound. Enter volume in milliliters or liters.
Why can displayed prices tie but only one option win?
The display rounds to four decimal places. Ranking uses the unrounded unit prices, apart from a tiny floating-point tolerance for equivalent quantities.
Does the tool add tax or convert currency?
No. Enter comparable total prices in one currency, including any costs you want to compare. Currency changes formatting only.