# Convert speed
## Description
This operation converts values between different units of speed.
***
## Data types
These are the input/output expected data types for this operation:
### Input data
 - Values whose unit of speed you want to transform. They must be strings representing numbers.
### Output data
 - Resulting values after transforming them to the selected unit of speed.
***
## Parameters
These are the parameters you need to configure to use this operation (mandatory parameters are marked with a **\***):
Input units*
Enter the unit of speed of your input data. You must indicate one of the following:
**Metric**
* `Metres per second (m/s)`
* `Kilometres per hour (km/h)`
**Imperial**
* `Miles per hour (mph)`
* `Knots (kn)`
**Comparisons**
* `Human hair growth rate`
* `Bamboo growth rate`
* `World's fastest snail`
* `Usain Bolt's top speed`
* `Jet airliner cruising speed`
* `Concorde`
* `SR-71 Blackbird`
* `Space Shuttle`
* `International Space Station`
**Scientific**
* `Sound in standard atmosphere`
* `Sound in water`
* `Lunar escape velocity`
* `Earth escape velocity`
* `Earth's solar orbit`
* `Solar system's Milky Way orbit`
* `Milky Way relative to the cosmic microwave background`
* `Solar escape velocity`
* `Neutron star escape velocity (0.3c)`
* `Light in a diamond (0.4136c)`
* `Signal in an optical fibre (0.667c)`
* `Light (c)`
Output units*
Enter the required unit of speed of your output data. You must indicate one of the following:
**Metric**
* `Metres per second (m/s)`
* `Kilometres per hour (km/h)`
**Imperial**
* `Miles per hour (mph)`
* `Knots (kn)`
**Comparisons**
* `Human hair growth rate`
* `Bamboo growth rate`
* `World's fastest snail`
* `Usain Bolt's top speed`
* `Jet airliner cruising speed`
* `Concorde`
* `SR-71 Blackbird`
* `Space Shuttle`
* `International Space Station`
**Scientific**
* `Sound in standard atmosphere`
* `Sound in water`
* `Lunar escape velocity`
* `Earth escape velocity`
* `Earth's solar orbit`
* `Solar system's Milky Way orbit`
* `Milky Way relative to the cosmic microwave background`
* `Solar escape velocity`
* `Neutron star escape velocity (0.3c)`
* `Light in a diamond (0.4136c)`
* `Signal in an optical fibre (0.667c)`
* `Light (c)`
***
## Example
Suppose you want to convert a series of events from **kilometers per hour** into **miles per hour**:
1. In your Pipeline, open the required [Action](https://docs.onum.com/the-workspace/pipelines/actions) configuration and select the input **Field**.
2. In the **Operation** field, choose **Convert speed**.
3. Set **Input units** to `Kilometres per hour (km/h)`.
4. Set **Output units** to `Miles per hour (mph)`.
5. Give your **Output field** a name and click **Save**. The unit of speed of the values in your input field will be transformed. For example:
```
Input data - "200"
Input units - "Kilometres per hour (km/h)"
Output units - "Miles per hour (mph)"
Output data - "124.2841804"
```
{% hint style="info" %}
You can try out operations with specific values using the **Input** field above the operation. You can enter the value in the example above and check the result in the **Output** field.
{% endhint %}
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