# Unit Conversion Calculator Instructions

Convert length, mass, temperature, area, volume, speed, data, and other units in Calcul.io using natural expressions and explicit target units.

## Units and Conversions

A very handy functionality are equations with units and conversions between them.

Simply treat the value with unit as any other number:

```calculio
2 * 1 km
```

If you want to convert from one unit to another, there's nothing easier:

```calculio
1 km to m
10 miles/second in km/h
```

You can even do both at once!

```calculio
2 * 1 km in m
```

Don't worry about complicated equations with mixed units.

```calculio
5 *(2m + 1 km) + 28cm in m
```

Or even mix dimensions! Here we're mixing lengths and area without any problem:

```calculio
2cm * 2cm + 12cm^2
```

Helpful constants are ready to simplify your equations:

```calculio
speedOfLight to km/h
speedOfLight to miles/s
```

To turn a rate into a distance, multiply it by a time unit:

```calculio
speedOfLight * 1 second to miles
```

[See the full list of available units with more examples](https://calcul.io/instructions/units/index.md)

[Next: **Functions**](https://calcul.io/instructions/functions/index.md)

**Table of content**

- [Introduction](https://calcul.io/instructions/index.md)
- [Units and conversions](https://calcul.io/instructions/conversions/index.md)
- [List of units](https://calcul.io/instructions/units/index.md)
- [Functions](https://calcul.io/instructions/functions/index.md)
- [Constants](https://calcul.io/instructions/constants/index.md)
- [Currencies, crypto, stock](https://calcul.io/instructions/currency/index.md)
- [Time and dates](https://calcul.io/instructions/time/index.md)