---
title: "std::units::toMillimeters"
excerpt: "Convert a number to millimeters from its current units."
layout: manual
---

Convert a number to millimeters from its current units.



```kcl
units::toMillimeters(@num: [number](/docs/kcl/types/number)(mm)): [number](/docs/kcl/types/number)(mm)
```


### Arguments

| Name | Type | Description | Required |
|----------|------|-------------|----------|
| `num` | `number(mm)` |  | Yes |

### Returns

`number(mm)`