# fixedDeltaTime

> The interval in seconds of in-game time at which physics and other fixed frame rate updates (like MonoBehaviour's MonoBehaviour.FixedUpdate() ) are performed.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public static float fixedDeltaTime { get; set; }
```

### Remarks

The `fixedDeltaTime` interval is always relative to the in-game time which [Time.timeScale](/engine/6000.0/script-reference/unityengine/time/timescale.md) affects. A `fixedDeltatime` of 1 second in a game with a [Time.timeScale](/engine/6000.0/script-reference/unityengine/time/timescale.md) of 0.5 means fixed updates occur every 2 seconds of real time.

See [Time and Frame Rate Management](/engine/6000.0/manual/scripting/object-oriented-development/managing-time-and-frame-rate.md) in the User Manual for more information about how this property relates to the other Time properties.