---
title: Path.roughLength()
---

The `Path.roughLength()` method returns a (very) rough estimate of the path's length.

## Signature

```js
Number path.roughLength()
```

## Example

<Example caption="Example of the Path.roughLength() method">
```js
({ Point, points, Path, paths, macro, units, part }) => {

points.B = new Point(10, 30)
points.BCp2 = new Point(40, 20)
points.C = new Point(120, 30)
points.CCp1 = new Point(50, -30)

paths.example = new Path()
.move(points.B)
.curve(points.BCp2, points.CCp1, points.C)

macro("pd", {
path: paths.example,
id: 'macro1',
d: -10,
force: true,
text: `Path.roughLength() = ${units(paths.example.roughLength())}`
})
macro("pd", {
path: paths.example,
id: 'macro2',
d: 10,
force: true,
text: `Path.length() = ${units(paths.example.length())}`
})

return part
}

```
</Example>

## Notes

The `Path.roughLength()` is not intended to give an estimate that is accurate, but rather differentiates between paths that are a few millimeter long, or meters long.

It calculates the length without *walking the (cubic) Bézier curve* making it very fast and very inaccurate (for curves).
It is typically used to determine how much precision to apply when walking a curve.
```
