CSS Grid Layout: The Fr Unit

With CSS Grid Layout, we get a new flexible unit: the Fr unit. Fr is a fractional unit and 1fr is for 1 part of the available space. The following are a few examples of the fr unit at work. The grid items in these examples are placed onto the grid with grid areas.

The demos should still work on non-supporting browsers, thanks to this Grid polyfill.

.container {
  display: grid;

  grid-template-columns: 1fr 1fr 1fr 1fr;
  grid-template-rows: 100px 200px 100px;

  grid-template-areas:
        "head head2 . side"
        "main main2 . side"
        "footer footer footer footer";
}

The 4 columns each take up the same amount of space.

Head
Head 2
Main
Main 2
Side
Footer

Now here’s the same example with different fr values. Notice the change in the layout:

.container {
  /* ... */

  grid-template-columns: 1fr 1fr 40px 20%;
  grid-template-rows: 100px 200px 100px;

  /* ... */
}
Head
Head 2
Main
Main 2
Side
Footer

In the following last example, the sidebar item covers 2fr, so it’ll be the same width as the items that span the 1st and 2nd columns:

.container {
  /* ... */

  grid-template-columns: 1fr 1fr 40px 2fr;
  grid-template-rows: 100px 200px 100px;

  /* ... */
}
Head
Head 2
Main
Main 2
Side
Footer

Mixed Units

As you saw in the previous examples, you can mix fr values with fixed and percentage values. The fr values will be divided between the space that’s left after what’s taken by the other values.

For example, if you have a grid with 4 columns as in the following snippet, the 1st column will be 300px, the second 80px (10% of 800px), the 3rd and 4th columns will be 210px (each occuping half of the remaining space):

main {
  width: 800px;
  display: grid;
  grid-template-rows: 300px 10% 1fr 1fr;
  /* 300px 80px 210px 210px */

  grid-template-rows: auto;
}
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