# Unit conversion

> Let shoppers switch units on a size chart without maintaining two tables.

Source: https://docs.tryicona.com/size-chart/charts/unit-conversion/  
App: Icona: Size Chart & Size Guide  
Last updated: 2026-09-07

Automatic unit conversion gives shoppers two measurement options without requiring you to maintain two tables. Icona calculates the converted values from the measurements you enter.

## Enable unit conversion

The **Automatic unit conversion** toggle is off by default.

1. Turn on **Automatic unit conversion**.
2. Set **Base unit** to the unit used in your table.
3. Check the read-only **Converted unit** that Icona selects.

The default base unit is cm.

## Supported pairs

| Base unit | Converted unit |
| --------- | -------------- |
| cm        | in             |
| in        | cm             |
| mm        | in             |
| kg        | lbs            |
| lbs       | kg             |

## What gets converted

Icona converts only cells whose full value is numeric. It rounds converted values to two decimal places.

## Keep a column unchanged

To exclude a column from conversion, add an asterisk to the end of its header. For example, use `Size*` for a column that contains size labels.

## What shoppers see

When conversion is enabled, shoppers can use a toggle in the size chart popup to switch between the base and converted units.

## Related pages

See [Advanced table](https://docs.tryicona.com/size-chart/charts/advanced-table/) to learn how to build and edit the measurement table.