# llGetObjectMass

*LSL function*

```lsl
float float llGetObjectMass(key id);
```

- `key id`: UUID of the avatar or object to query.

- Returns: `float`
- Energy: 10

Returns a float representing the mass of the avatar or object specified by id.

Returns a [float](https://wiki.secondlife.com/wiki/float) that is the mass of **id**

```lsl title="How to use" frame="terminal"
float result = llGetObjectMass(NULL_KEY);
```

## Caveats

- Returns zero if **id** is not found in the region.
- **id** can be any prim in the object.

## Examples

<details open>
<summary>Example 1</summary>

```lsl
default
{
    touch(integer n)
    {
        llSay(0, llDetectedName(0) + " your mass is " + (string)llGetObjectMass(llDetectedKey(0)) + " lindogram.");
    }
}
//Anylyn Hax 15:02, 28 July 2007 (PDT)
```

</details>

## Notes

- [Mass](http://en.wikipedia.org/wiki/Mass) in SL is expressed as *lindogram*. One lindogram appears to be equal to 100 kilograms.
- Mass for avatars is relative to shape/size, and unaffected by attachments. However, a survey of masses for avatars shows less variation than one would expect relative to shape/size, and the lindogram masses do not appear in any way realistic.
- Sitting avatars add their mass to the object.
- This function returns a mass of 0.01 for child agents.
- This function is a handy way to determine if an object or avatar still exists on a region. Other methods exist (such as checking that [OBJECT_OWNER](/constants/OBJECT_OWNER/) returned by [llGetObjectDetails](/functions/llGetObjectDetails/) is a valid key), but this has slightly less overhead.

## Tests

- [llGetObjectMass_Test](https://wiki.secondlife.com/wiki/llGetObjectMass_Test)

## History

Prior to server code version 1.18.6.76747 avatar mass was fixed at 1.954922 lindogram. It is now relative to Avatar shape/size.

## See also

### Functions

- [llGetMass](/functions/llGetMass/) — Gets the current object mass.

---

*Source: [LlGetObjectMass](https://wiki.secondlife.com/wiki/LlGetObjectMass) on the Second Life Wiki. Content from the Second Life Wiki articles LlGetObjectMass (revision 1214522, 2023-09-04) and Template:LSL Function/uuid (revision 1195911, 2015-03-21), CC BY-SA 3.0.*

---

From lsl.dev: https://lsl.dev/functions/llGetObjectMass/