# forge.ta.BollingerWidth

```python
forge.ta.BollingerWidth(**inputs: Any) -> None
```

The distance between the Bollinger Bands relative to the middle line.

width = (upper - lower) / middle

middle = the simple average of the source over period

upper = middle + deviations * the population standard deviation of the same window, lower = middle - deviations * the same

Since Forge API 1.