> For the complete documentation index, see [llms.txt](https://kb.bravegen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kb.bravegen.com/carbon/configuration/units-of-measure.md).

# Units of Measure

Supported units, aliases, and custom unit setup for incoming data.

## System Units of Measure

BraveGen supports the following units of measure, in alignment with the factors in our [Emission Factor libraries](/carbon/core-concepts/emission-factors/emission-factor-libraries.md). If the data you are loading uses units not outlined below, you will need to create corresponding [custom unit](#custom-units)[s](#custom-units) before the data can be processed by the system. You can see a full list of these under **Settings -> Units of Measure**. The system supports user defined 'aliases' which can be used to link a different spelling or symbol to an existing UoM.

<table><thead><tr><th width="256.78515625">Name</th><th width="152.4765625">Symbol</th><th width="313.84765625">Aliases</th></tr></thead><tbody><tr><td>bar</td><td>bar</td><td>{Pressure (bar)}</td></tr><tr><td>cubic metre</td><td>m³</td><td>{cubic meter,cubic meters,cubic metre,cubic metres,m3}</td></tr><tr><td>cubic metre of milk</td><td>m³ milk</td><td>{m3 of milk}</td></tr><tr><td>Currency</td><td></td><td>{$,dollar,dong,euro,franc,hryvnia,lira,naira,Philippine peso,pound,real,ruble,rupee,shekel,won,yen}</td></tr><tr><td>employee-day</td><td>empl./day</td><td>{empl./day,employee days,employee per day}</td></tr><tr><td>gigajoule</td><td>GJ</td><td>{Gigajoule,GJ}</td></tr><tr><td>gigawatt-hour</td><td>GWh</td><td>{Gigawatt-hour,GWh}</td></tr><tr><td>gram</td><td>g</td><td>{grams}</td></tr><tr><td>hectare</td><td>ha</td><td>{ha,hectare}</td></tr><tr><td>hour</td><td>h</td><td>{h,hour,Hours}</td></tr><tr><td>joule</td><td>J</td><td>{Joule}</td></tr><tr><td>kilogram</td><td>kg</td><td>{kg,Kgs,kilogram}</td></tr><tr><td>kilogram nitrogen</td><td>kg N</td><td>{kilogram Nitrogen}</td></tr><tr><td>kilograms of carbon dioxide equivalent</td><td>kgCO2e</td><td>{kgCO2e}</td></tr><tr><td>kilolitre</td><td>kL</td><td>{kL}</td></tr><tr><td>kilometre</td><td>km</td><td>{kilometre,Kilometre,km}</td></tr><tr><td>kilowatt-hour</td><td>kWh</td><td>{kilowatthour,kilowatt-hour,kWh}</td></tr><tr><td>kilowatt-hour gross calorific value</td><td>kWh (Gross CV)</td><td>{kWh}</td></tr><tr><td>kilowatt-hour net calorific value</td><td>kWh (Net CV)</td><td>{kWh}</td></tr><tr><td>litre</td><td>L</td><td>{L,liter,liters,litre,litres}</td></tr><tr><td>megajoule</td><td>MJ</td><td>{megajoule,Megajoule,Mega Joule,MJ}</td></tr><tr><td>megalitre</td><td>ML</td><td>{million L,million litres}</td></tr><tr><td>metre</td><td>m</td><td>{m,Metre}</td></tr><tr><td>mile</td><td>mi</td><td>{mile,miles}</td></tr><tr><td>parts per million</td><td>ppm</td><td>{Parts per million,PPM}</td></tr><tr><td>pascal</td><td>Pa</td><td>{pascal,Pressure (pascal)}</td></tr><tr><td>passenger-kilometre</td><td>pkm</td><td>{passenger.km,person kilometre,person km,pkm}</td></tr><tr><td>per capita</td><td>per capita</td><td>{per capita}</td></tr><tr><td>per FTE working hour</td><td>FTE/h</td><td>{fte,Per FTE Working Hours}</td></tr><tr><td>per head</td><td>per head</td><td>{per head}</td></tr><tr><td>pound per square inch</td><td>psi</td><td>{Pressure (psi)}</td></tr><tr><td>room-night</td><td>room-night</td><td>{room-night,Room per night}</td></tr><tr><td>square metre</td><td>m²</td><td>{m2,m²,square metre}</td></tr><tr><td>tonne</td><td>t</td><td>{T,tonne,tonnes,Tonnes}</td></tr><tr><td>tonne-kilometre</td><td>tkm</td><td>{tkm,tonne.km,tonne per kilometre}</td></tr><tr><td>tonne of crushed grapes</td><td>t crushed grapes</td><td>{tonne of crushed grapes}</td></tr><tr><td>tonne of livestock - Meat (Excl Poultry)</td><td>t livestock</td><td>{tonne of kills}</td></tr><tr><td>tonne of livestock - Poultry</td><td>t livestock</td><td>{tonne of kills}</td></tr><tr><td>tonne of product</td><td>t product</td><td>{tonne of product}</td></tr><tr><td>tonnes of carbon dioxide equivalent</td><td>tCO2e</td><td>{tCO2e}</td></tr></tbody></table>

## Custom Units

Custom units can be created to deal with incoming data that does not match the standard units covered by BraveGen system emission factors.

{% hint style="info" %}
For inventory items attached to sources with custom units, you will need to either include a calculation to convert to a unit supported by the emission factor, or create a [custom emission factor](/carbon/core-concepts/emission-factors/custom-emission-factors.md) that uses your custom unit.
{% endhint %}

### Creating a Custom Unit of Measure

Custom units can only be created by users with admins or editor roles. Click the ' + Unit of measure' button to add a new custom unit of measure row. You will need to define:

* **Name**
* **Type** - Energy, Quantity, Volume, Weight, Area, Temperature, Cost, Distance, Pressure, Other
* **Symbol** - displayed in reports
* **Default Aggregation** - how multiple values across a time period are reported
  * Sum - add values together (standard for emission generating activity)
  * Latest - use the most recent (used for metrics, like star ratings)

### Deleting a Custom Unit of Measure

Custom units can only be deleted if they are not in use. This is indicated by a checkmark in the 'in use' column.