CSS grid – maximum number of columns without media queries

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With CSS grid you can consider the use of max(width, 100%/N) where N is the maximum number of columns. If the width of the container increases, 100%/N will for sure be bigger than width, thus we won’t have more than N elements per row.

.grid-container {
  --n: 4; /* The maximum number of columns */
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(max(200px, 100%/var(--n)), 1fr));
}

.grid-item {
  background: tomato;
  padding: 5px;
  height: 50px;
  margin: 10px;

  line-height: 50px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
  box-sizing: border-box;
}
<div class="grid-container">
  <div class="grid-item">1</div>
  <div class="grid-item">2</div>
  <div class="grid-item">3</div>
  <div class="grid-item">4</div>
  <div class="grid-item">5</div>
  <div class="grid-item">6</div>
  <div class="grid-item">7</div>
  <div class="grid-item">8</div>
</div>

<div class="grid-container" style="--n:3">
  <div class="grid-item">1</div>
  <div class="grid-item">2</div>
  <div class="grid-item">3</div>
  <div class="grid-item">4</div>
  <div class="grid-item">5</div>
  <div class="grid-item">6</div>
  <div class="grid-item">7</div>
  <div class="grid-item">8</div>
</div>

With gaps:

.grid-container {
  --n: 4; /* The maximum number of columns */
  display: grid;
  grid-template-columns: repeat(auto-fill,
           minmax(max(200px,(100% - (var(--n) - 1)*10px)/var(--n)), 1fr));
  gap: 10px;
  margin: 5px;
}

.grid-item {
  background: tomato;
  padding: 5px;
  height: 50px;

  line-height: 50px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
  box-sizing: border-box;
}
<div class="grid-container">
  <div class="grid-item">1</div>
  <div class="grid-item">2</div>
  <div class="grid-item">3</div>
  <div class="grid-item">4</div>
  <div class="grid-item">5</div>
  <div class="grid-item">6</div>
  <div class="grid-item">7</div>
  <div class="grid-item">8</div>
</div>

<div class="grid-container" style="--n:3">
  <div class="grid-item">1</div>
  <div class="grid-item">2</div>
  <div class="grid-item">3</div>
  <div class="grid-item">4</div>
  <div class="grid-item">5</div>
  <div class="grid-item">6</div>
  <div class="grid-item">7</div>
  <div class="grid-item">8</div>
</div>

With flexbox, you can simply set a max-width to the container since your elements have a fixed width:

.flex-container {
  display: flex;
  flex-wrap: wrap;
  max-width: calc(5*(200px + 20px));
}

.flex-item {
  background: tomato;
  padding: 5px;
  width: 200px;
  height: 100px;
  margin: 10px;

  line-height: 100px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
  box-sizing: border-box;
}
<div class="flex-container wrap">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
  <div class="flex-item">7</div>
  <div class="flex-item">8</div>
</div>

The only drawback is that you need to know the width of your elements and their margin to correctly set the max-width.

If you want your elements to expand and cover all the width, you can use a trick with min-width like below:

.flex-container {
  display: flex;
  flex-wrap: wrap;
}

.flex-item {
  background: tomato;
  padding: 5px;
  min-width: 200px;
  width: calc(100%/5 - 20px); /* 5 columns */
  height: 100px;
  margin: 10px;

  line-height: 100px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
  box-sizing: border-box;
}
<div class="flex-container wrap">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
  <div class="flex-item">7</div>
  <div class="flex-item">8</div>
</div>

Here also you need to consider the margin. You can easily make this more flexible using CSS variables:

.flex-container {
  display: flex;
  flex-wrap: wrap;
}

.flex-item {
  --m: 10px;
  background: tomato;
  padding: 5px;
  min-width: 200px;
  width: calc(100%/5 - 2*var(--m)); /* 5 columns */
  height: 100px;
  margin: var(--m);

  line-height: 100px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
  box-sizing: border-box;
}
<div class="flex-container wrap">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
  <div class="flex-item">7</div>
  <div class="flex-item">8</div>
</div>

You can also consider flex-grow if you want your element to always expand (even when there is a wrap), but you may face the issue of the last row that you need to fix with some hacks:

.flex-container {
  display: flex;
  flex-wrap: wrap;
  --m: 10px;
}

.flex-item {
  background: tomato;
  padding: 5px;
  min-width: 200px;
  flex-grow: 1;
  width: calc(100%/5 - 2*var(--m)); /* 5 columns */
  height: 100px;
  margin: var(--m);

  line-height: 100px;
  color: white;
  font-weight: bold;
  font-size: 2em;
  text-align: center;
  box-sizing: border-box;
}

.flex-container span {
  min-width: 200px;
  flex-grow: 1;
  width: calc(100%/5 - 2*var(--m)); /* 5 columns */
  margin: 0 var(--m);
}
<div class="flex-container wrap">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
  <div class="flex-item">7</div>
  <div class="flex-item">8</div>

  <!-- 4 empty elements to fix the issue (we can also use a pseudo element) -->
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

In the example below, we made the number of columns to be 5 so we will need at least 4 empty elements to fix the issue in case we will have one to 4 elements in the last row.

Of course, this is a drawback, but since you know the number of columns you can easily set those empty elements and you won’t need any JavaScript.

To make it more flexible, here is an idea with CSS variables:

.flex-container {
  display: flex;
  flex-wrap: wrap;
  border: 1px solid;
  --m: 10px;
  --n: 5;
  --width: 150px;
}

.flex-item {
  background: tomato;
  min-width: var(--width);
  flex-grow: 1;
  width: calc(100%/var(--n) - 2*var(--m));
  height: 50px;
  margin: var(--m);

  box-sizing: border-box;
}

.flex-container span {
  display: contents; /* Each span will give us 2 elements */
}
.flex-container span: before,
.flex-container span: after,
.flex-container: before,
.flex-container: after{
  content: "";
  min-width: var(--width);
  flex-grow: 1;
  width: calc(100%/var(--n) - 2*var(--m));
  margin :0 var(--m);
  order: 1; /* We make sure they are at the end */
}
<div class="flex-container wrap">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
  <div class="flex-item">7</div>
  <div class="flex-item">8</div>

  <!-- A lot of elements !! -->
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

<div class="flex-container wrap" style="--n:10">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
  <div class="flex-item">7</div>
  <div class="flex-item">8</div>

  <!-- A lot of elements !! -->
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

<div class="flex-container wrap" style="--n:3">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
  <div class="flex-item">7</div>
  <div class="flex-item">8</div>

  <!-- A lot of elements !! -->
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

I used display: contents to be able to set N empty elements that will later be considered as 2*N which can reduce the code.

If you will have 7 columns, we will only need 6 extra elements. We can use the two pseudo elements then only 2 empty element to cover the remaining 4.

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