# Unit Price Calculator

> The Unit Price Calculator is a free cost-per-unit comparison tool in the SoapBox tools suite. It answers the everyday grocery-aisle question — which pack is actually the better value — by reducing…

Canonical: https://wiki.soapbox.community/wiki/Unit_Price_Calculator
Section: Tools
Last updated: 2026-10-20
Publisher: Library of Ashurbanipal (Van Kush Family Research Institute), https://wiki.soapbox.community

The **Unit Price Calculator** is a free cost-per-unit comparison tool in the SoapBox tools suite. It answers the everyday grocery-aisle question — which pack is actually the better value — by reducing each option to its price per unit.

## What it does

Enter each option's price and size (in whatever unit you choose — grams, millilitres, or items), and the calculator gives the price per unit for each and highlights the best value. A pack count handles multi-buys, so a four-pack and a single bottle can be compared fairly. Options that are cheaper on the sticker but worse per unit are flagged with how much more they cost relative to the best option.

## How to use it

Add as many options as you like; the comparison updates as you type. It runs entirely in the browser, needs no account, and sends nothing anywhere. A JSON API is available at /api/unit, taking a compact list of "price@size" (optionally "price@size×pack") entries.

## See also

- SoapBox Tools
- Percentage Calculator
- Soap Calculator

## Sources

- Standard arithmetic; no external data source.

## Coverage

Describes the SoapBox Unit Price Calculator: comparing price per unit across products, handling pack counts, and flagging the best value.