Your Level Might Be the Wrong Size, and It Could Be Throwing Off Your Work

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Levels come in many different shapes and sizes, and figuring out how long a level should be for a certain project isn’t always straightforward. Choosing the right size matters because a level that’s too short can miss uneven spots, while one that’s too long can be difficult to use in tight spaces.

Here’s how much of a surface a level should cover, which sizes work best, and when overhang is okay.

How Long Should a Level Be to Get an Accurate Reading?

It depends on the project, but a longer level is usually better for checking bigger surfaces. A shorter one might show that the middle of a board is level without catching a problem closer to either end.

The level doesn’t have to stretch across the entire surface, though. A 24-inch level can work on a four-foot shelf, for example, as long as the installer checks several spots along its length. For longer surfaces, a smaller level can sit on a long, straight board to check a wider area. A laser level is another option, especially when lining up things across a room.

The way the level sits on the material matters, too. A little sawdust or dirt underneath can affect the reading, so both surfaces should be clean. The tool also needs to sit firmly without rocking.

What Size Level Should You Use for Different Projects?

There’s no set rule for how much of a surface a level needs to cover, but it should fit comfortably and have enough contact to stay steady.

Different sizes work better for different jobs:

6 to 12 inches: Small levels, often called torpedo levels, are handy for working inside cabinets, around pipes, or anywhere there isn’t much room.
24 inches: A useful size for common household jobs, like hanging shelves or installing smaller cabinets.
48 inches: Works well for checking longer boards, countertops, and framing.
72 inches and longer: These are mostly useful for larger projects, including tall door frames and walls. They can be difficult to handle in smaller rooms.

“Use a 4-foot carpenter’s level for framing whenever you have room for its length,” according to The Home Depot. “Warps or waves in the boards can throw off a shorter carpenter’s level.”

Another common concern is whether the level can hang over the edge of whatever is being checked. Some overhang is fine, provided the tool has enough support to stay steady.

If it starts tipping or rocking, a shorter level will likely work better. The bubble doesn’t need to be directly above the material, either. It can still give an accurate reading even when that part of the tool hangs past the edge.