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+---
+layout: docs
+title: Sizing
+description: Easily make an element as wide or as tall with our width and height utilities.
+group: utilities
+toc: true
+---
+
+## Relative to the parent
+
+Width and height utilities are generated from the utility API in `_utilities.scss`. Includes support for `25%`, `50%`, `75%`, `100%`, and `auto` by default. Modify those values as you need to generate different utilities here.
+
+{{< example class="bd-example-flex" >}}
+<div class="w-25 p-3">Width 25%</div>
+<div class="w-50 p-3">Width 50%</div>
+<div class="w-75 p-3">Width 75%</div>
+<div class="w-100 p-3">Width 100%</div>
+<div class="w-auto p-3">Width auto</div>
+{{< /example >}}
+
+{{< example class="bd-example-flex" >}}
+<div style="height: 100px;">
+  <div class="h-25 d-inline-block" style="width: 120px;">Height 25%</div>
+  <div class="h-50 d-inline-block" style="width: 120px;">Height 50%</div>
+  <div class="h-75 d-inline-block" style="width: 120px;">Height 75%</div>
+  <div class="h-100 d-inline-block" style="width: 120px;">Height 100%</div>
+  <div class="h-auto d-inline-block" style="width: 120px;">Height auto</div>
+</div>
+{{< /example >}}
+
+You can also use `max-width: 100%;` and `max-height: 100%;` utilities as needed.
+
+{{< example class="bd-example-flex" >}}
+<div style="width: 50%; height: 100px;">
+  <div class="mw-100" style="width: 200%;">Max-width 100%</div>
+</div>
+{{< /example >}}
+
+{{< example class="bd-example-flex" >}}
+<div style="height: 100px;">
+  <div class="mh-100" style="width: 100px; height: 200px;">Max-height 100%</div>
+</div>
+{{< /example >}}
+
+## Relative to the viewport
+
+You can also use utilities to set the width and height relative to the viewport.
+
+```html
+<div class="min-vw-100">Min-width 100vw</div>
+<div class="min-vh-100">Min-height 100vh</div>
+<div class="vw-100">Width 100vw</div>
+<div class="vh-100">Height 100vh</div>
+```
+
+## CSS
+
+### Sass utilities API
+
+Sizing utilities are declared in our utilities API in `scss/_utilities.scss`. [Learn how to use the utilities API.]({{< docsref "/utilities/api#using-the-api" >}})
+
+{{< scss-docs name="utils-sizing" file="scss/_utilities.scss" >}}