---
id: "M:cAlgo.API.Position.ModifyVolume(System.Double)"
kind: "method"
type: "T:cAlgo.API.Position"
url: "https://help.ctrader.com/ctrader-algo/references/Trading/Positions/Position/ModifyVolume/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# Position.ModifyVolume

Member of [Position](https://help.ctrader.com/ctrader-algo/references/Trading/Positions/Position/index.md).

## ModifyVolume(double volume)

Shortcut for the Robot.ModifyPosition method to change the VolumeInUnits.

Environments: Desktop supported · CLI supported · Cloud supported.

C#:

```csharp
TradeResult ModifyVolume(double volume)
```

Python:

```python
position.ModifyVolume(volume: float) -> TradeResult
```

### Parameters

- `volume` (`double`, Python `float`): New Volume in Units

### Returns

`TradeResult` — 

### Examples

C#:

```csharp
var position = Positions.Find("myLabel");
if (position != null)
{
    var halfVolume = position.Symbol.NormalizeVolumeInUnits(position.VolumeInUnits / 2, RoundingMode.Down);
    var result = position.ModifyVolume(halfVolume);
    Print("Volume modified: {0}", result.IsSuccessful);
}
```

Python:

```python
position = api.Positions.Find("myLabel")
if position is not None:
    halfVolume = position.Symbol.NormalizeVolumeInUnits(position.VolumeInUnits / 2, RoundingMode.Down)
    result = position.ModifyVolume(halfVolume)
    api.Print(f"Volume modified: {result.IsSuccessful}")
```