---
title: "Unit price comparator — free, runs in your browser"
description: "Compare packs of different sizes and prices to find which is genuinely cheaper. Free, no sign-up, and nothing you enter leaves your browser."
url: https://atoneplace.net/tools/unit-price-comparator/
site: "At One Place"
---

# Unit price comparator

Compare packs of different sizes and prices to find which is genuinely cheaper.

## How it works

Enter several pack sizes and prices, and this converts each to a price per unit so they can be compared directly.

Bigger is not reliably cheaper, which is the reason this is worth checking rather than assuming. Studies of supermarket pricing repeatedly find a substantial minority of larger packs cost more per unit than the smaller size of the same product, sometimes because of promotions on the small pack and sometimes as deliberate pricing.

Units are normalised, so a 750 g pack and a 1 kg pack compare correctly, as do millilitres against litres and ounces against pounds. Mixing measurement systems in the comparison is fine.

The cheapest unit price is only the right answer if you will use it all. For anything perishable, the pack you finish is cheaper than the pack you throw a third of away.

> This tool runs entirely in your browser. Nothing you enter is sent to a server, logged or stored, and the page keeps working with the network disconnected.

## Common questions

### Is the bigger pack always cheaper per unit?

No. A substantial minority of larger packs cost more per unit, sometimes because the small pack is on promotion and sometimes by design. It is worth checking rather than assuming.

### How do I compare different units?

Convert both to the same base — this tool normalises grams against kilograms and millilitres against litres automatically, including across metric and imperial.

## Related pages

- [Percentage calculator](https://atoneplace.net/tools/percentage-calculator/)
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- [BMI calculator](https://atoneplace.net/tools/bmi-calculator/)
- [Tip calculator](https://atoneplace.net/tools/tip-calculator/)
- [Age calculator](https://atoneplace.net/tools/age-calculator/)
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- [Discount calculator](https://atoneplace.net/tools/discount-calculator/)

## Sources

- Calculated on this page — At One Place (/about/)