Price Per Unit Calculator
Unit price for comparing pack sizes.
Pack B is cheaper per unit
$0.0144
4.0% better value
The larger pack is not automatically better value — retailers regularly price them at a higher unit rate.
How the Price Per Unit Calculator works
Pack sizes are designed to resist comparison. Reducing everything to a price per unit is the only reliable way to see which is actually cheaper — and the larger pack is not always the answer.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
How is price per unit calculated?
Total price ÷ quantity. £4.50 for 300 g is £0.015 per gram, or £15 per kilogram. Converting to a familiar unit makes comparison across pack sizes immediate.
Is the bigger pack always cheaper per unit?
No. Retailers regularly price larger packs at a higher unit rate, relying on the assumption that bigger means better value. Checking takes seconds and is frequently worth it.
Why does unit pricing matter for sellers?
Because buyers increasingly compare it, and marketplaces display it automatically in some categories. A pack size that looks competitive on headline price but poor per unit will lose to a rival that optimised for the comparison.
What is the best pack size to sell?
The one whose unit price looks strong while the absolute price stays within impulse range. Larger packs improve unit economics for you but raise the barrier to a first purchase.