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title: fib
description: OpenBB Terminal Function
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# fib

Calculates the fibonacci retracement levels

### Usage

```python
fib [-p PERIOD] [--start START] [--end END]
```

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## Parameters

| Name | Description | Default | Optional | Choices |
| ---- | ----------- | ------- | -------- | ------- |
| period | Days to look back for retracement | 120 | True | range(1, 960) |
| start | Starting date to select | None | True | None |
| end | Ending date to select | None | True | None |

![fib](https://user-images.githubusercontent.com/46355364/154310727-81a1eab3-5565-42c7-8b47-4f80288dd700.png)

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