freesewing/markdown/dev/reference/api/utils/stretchtoscale/en.md

---
title: utils.stretchToScale()
---

The `utils.stretchToScale()` function calculates the scale for a given amount of
stretch.

## Signature

```js
float utils.stretchToScale(float stretch)
```

## Notes

The way people measure stretch intuitively is different from the way we handle stretch in code.

When people say _25% stretch_ they mean that 10 cm fabric gets stretched to 12.5 cm fabric.
In code and on our patterns, that means we need to scale things by 80%.

This function does that by returning:

```js
1 / (1 + parseFloat(stretch))
```
Revert "chore: Linting for markdown and js" This reverts commit 1c92e0f655c1b34e4b1f6807914529cc4d82ff81. 2021-10-17 18:26:00 +02:00			`---`
chore(markdown): Updated utils docs for v3 2022-10-01 22:20:43 +02:00			`title: utils.stretchToScale()`
Revert "chore: Linting for markdown and js" This reverts commit 1c92e0f655c1b34e4b1f6807914529cc4d82ff81. 2021-10-17 18:26:00 +02:00			`---`
feat: Flat import of markdown repo This is a flat (without history) import of (some of) the content from our markdown module. We've imported this without history because the repo contains our blog posts and showcases posts content prior to porting them to strapi. Since this contains many images, it would balloon the size of this repo to import the full history. Instead, please refer to the history of the (archived) markdown repo at: https://github.com/freesewing/markdown 2021-08-25 16:09:31 +02:00
chore(markdown): Updated utils docs for v3 2022-10-01 22:20:43 +02:00			The `utils.stretchToScale()` function calculates the scale for a given amount of
			`stretch.`

			`## Signature`

feat: Flat import of markdown repo This is a flat (without history) import of (some of) the content from our markdown module. We've imported this without history because the repo contains our blog posts and showcases posts content prior to porting them to strapi. Since this contains many images, it would balloon the size of this repo to import the full history. Instead, please refer to the history of the (archived) markdown repo at: https://github.com/freesewing/markdown 2021-08-25 16:09:31 +02:00			```js
			`float utils.stretchToScale(float stretch)`
			```

chore(markdown): Updated utils docs for v3 2022-10-01 22:20:43 +02:00			`## Notes`

feat: Flat import of markdown repo This is a flat (without history) import of (some of) the content from our markdown module. We've imported this without history because the repo contains our blog posts and showcases posts content prior to porting them to strapi. Since this contains many images, it would balloon the size of this repo to import the full history. Instead, please refer to the history of the (archived) markdown repo at: https://github.com/freesewing/markdown 2021-08-25 16:09:31 +02:00			`The way people measure stretch intuitively is different from the way we handle stretch in code.`

fix(docs): Insert space between numbers and SI units 2022-12-26 07:00:16 -08:00			`When people say _25% stretch_ they mean that 10 cm fabric gets stretched to 12.5 cm fabric.`
feat: Flat import of markdown repo This is a flat (without history) import of (some of) the content from our markdown module. We've imported this without history because the repo contains our blog posts and showcases posts content prior to porting them to strapi. Since this contains many images, it would balloon the size of this repo to import the full history. Instead, please refer to the history of the (archived) markdown repo at: https://github.com/freesewing/markdown 2021-08-25 16:09:31 +02:00			`In code and on our patterns, that means we need to scale things by 80%.`

chore(markdown): Updated utils docs for v3 2022-10-01 22:20:43 +02:00			`This function does that by returning:`
feat: Flat import of markdown repo This is a flat (without history) import of (some of) the content from our markdown module. We've imported this without history because the repo contains our blog posts and showcases posts content prior to porting them to strapi. Since this contains many images, it would balloon the size of this repo to import the full history. Instead, please refer to the history of the (archived) markdown repo at: https://github.com/freesewing/markdown 2021-08-25 16:09:31 +02:00
			```js
chore(markdown): Udpated code style in utils examples 2022-10-01 23:13:39 +02:00			`1 / (1 + parseFloat(stretch))`
feat: Flat import of markdown repo This is a flat (without history) import of (some of) the content from our markdown module. We've imported this without history because the repo contains our blog posts and showcases posts content prior to porting them to strapi. Since this contains many images, it would balloon the size of this repo to import the full history. Instead, please refer to the history of the (archived) markdown repo at: https://github.com/freesewing/markdown 2021-08-25 16:09:31 +02:00			```