# stroke_to_bpm()

Blow rate of a free-falling ram from its stroke; inverse of [bpm_to_stroke](../reference/bpm_to_stroke.md#driven_pile.bpm_to_stroke).

Usage

[Source](https://github.com/lornearnold/driven-pile/blob/main/src/driven_pile/inputs.py#L39-L54)

``` python
stroke_to_bpm(stroke)
```

## Parameters

`stroke: array_like`  
Stroke (drop height), ft.

## Returns

`ndarray`  
Hammer blows per minute.