Are these the exact sizes in the store?

No. 16–28, 28–48, 48–75, and 75–120 inches are typical ranges. Read the span printed on the package before you buy. Use the range where your width sits in the middle, not at the maximum.

Can I enter centimeters?

Yes. Switch the unit and the width converts. The recommendation is still matched to the inch ranges these rods are usually labeled with, and the result shows the inch equivalent.

What if my width is near the maximum?

The rod is more likely to creep. If another range covers the opening and extends several inches past it, buy that one. If the next typical range starts above your width, it may not compress enough. Do not force it.

Is a thicker rod stronger?

Often, but the weight rating and the span matter more than diameter. A long rod holds less than a short one of the same type. An unrated rod is for a curtain, shirts, lids, or a few bottles.

Can I use a tension rod as a grab bar or a shelf?

No. A grab bar is screwed into the wall and meant to hold a person. A basic tension rod is not a shelf. Books, dishes, and a board laid across the rod belong on real furniture.

Tension Rod Size Calculator

Quick answer

Buy the typical tension rod range where your opening sits near the middle, not at the printed maximum. A rod stretched to its longest setting is the one that slips.

Opening width (inches)Use

48–75 in

60 in sits near the middle of the 48–75 in range, with room to extend. These are typical ranges, not one brand's exact sizes. For a shower, a common diameter is about 1 in. Plan on a shower curtain and rings. Skip a caddy unless the package says the rod can hold one.

These results are estimates. Measure your space and check the product's listed size before you buy.

Typical tension rod ranges. A package may print a slightly different span.
Typical range	Centimeters	Near the middle	Often used for
16–28 in	40.6–71.1 cm	about 20–24 in	Narrow window, cabinet, under-sink
28–48 in	71.1–121.9 cm	about 35–41 in	Window or a short closet
48–75 in	121.9–190.5 cm	about 58–66 in	Shower or closet
75–120 in	190.5–304.8 cm	about 91–104 in	Wide closet or a long wall

Which size range should you buy?

Stores usually sell four spans: 16–28, 28–48, 48–75, and 75–120 inches. These are typical ranges. The numbers on your package may differ by an inch or two.

When a width lands on the edge of two ranges, such as 28 inches, buy the longer one. That puts the opening at the short end, with room left to extend.

How do you measure the opening?

Measure left to right at the height the rod will sit, then a little above and a little below. Use the smallest of those numbers. Walls are not always parallel.

The rubber cup needs a flat spot. Leave trim, a raised tile edge, or a pipe out of the measurement if the cup cannot sit on it.

What diameter and load should you plan on?

Diameter and load follow the job. A curtain wants a thinner rod. A closet of shirts wants something closer to an inch thick. The lines in the result are typical guidance, not a rating from one brand.

If the package lists no weight rating, treat the rod as a curtain rod only. A longer span holds less than a short span of the same rod.

Why avoid the maximum?

At full extension the spring has less left to give, and the cups slip. Leave a few inches of unused travel.

If your width is near the top of a typical range and the next range starts above that width, do not buy a rod that will not compress. Look for a package whose printed span still covers the opening and continues past it.

Frequently asked questions

Are these the exact sizes in the store?: No. 16–28, 28–48, 48–75, and 75–120 inches are typical ranges. Read the span printed on the package before you buy. Use the range where your width sits in the middle, not at the maximum.
Can I enter centimeters?: Yes. Switch the unit and the width converts. The recommendation is still matched to the inch ranges these rods are usually labeled with, and the result shows the inch equivalent.
What if my width is near the maximum?: The rod is more likely to creep. If another range covers the opening and extends several inches past it, buy that one. If the next typical range starts above your width, it may not compress enough. Do not force it.
Is a thicker rod stronger?: Often, but the weight rating and the span matter more than diameter. A long rod holds less than a short one of the same type. An unrated rod is for a curtain, shirts, lids, or a few bottles.
Can I use a tension rod as a grab bar or a shelf?: No. A grab bar is screwed into the wall and meant to hold a person. A basic tension rod is not a shelf. Books, dishes, and a board laid across the rod belong on real furniture.

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