How to Tell If Your Pool Table Is Level (And What to Do About It)
A pool table that isn't level doesn't just look slightly off. It changes how every single shot behaves. Balls drift toward one pocket, stop rolling before they should, or curve slightly off their line even on a shot hit dead straight. If you've ever wondered whether your table's problem is your stroke or your table, leveling is usually the first thing to rule out.
Quick answer: A pool table is level when a ball placed anywhere on the playing surface stays still, and when a carpenter's level (or a bubble/spirit level) reads flat in every direction across the slate. Most tables go out of level over time due to floor settling, humidity changes, or the natural loosening of leveling components, not from any single event. Correcting it involves adjusting shims or leveling bolts under the slate, not the legs of the table itself. That last part surprises a lot of people, so it's worth explaining in detail.
Why Leveling Matters More Than People Think
Pool tables are precision equipment disguised as furniture. The playing surface sits on slate, typically in one, two, or three pieces depending on the table, and that slate has to be perfectly flat and perfectly level for the game to play the way it's designed to. A difference of even a few millimeters across the bed is enough to create a noticeable roll.
This matters for a few reasons beyond frustrating misses:
It changes how you learn the game. If you're a newer player, an unlevel table teaches you to compensate for something that has nothing to do with skill, which makes it harder to improve on a table that plays correctly.
It accelerates cloth wear. Balls that consistently roll toward the same low point wear the cloth unevenly in that area over time.
It can mask or worsen other problems. A table that seems unlevel is sometimes actually a table with a cracked slate seam or a structural issue, and leveling adjustments alone won't fix that.
How to Tell If Your Pool Table Is Level
There are two reliable ways to check, and using both gives you the clearest picture.
The Ball Test
Place a pool ball gently in the center of the table and let go without pushing it. On a level table, it stays put. On an unlevel one, it rolls, usually toward a corner or a specific rail. Repeat this in several spots across the table (each corner, the center, near each pocket) since a table can be level in one area and off in another, especially on three-piece slate tables where each section is leveled independently.
Pay attention not just to whether the ball rolls, but where it consistently ends up. That tells you which section of the slate needs adjustment.
The Level Test
A basic carpenter's level or a dedicated pool table spirit level gives you a more precise reading than the ball test alone. Place it directly on the slate (not the cloth-covered surface if you can help it, since felt can create a slightly misleading reading) in multiple directions: side to side, end to end, and diagonally. Check each of the slate sections separately on multi-piece tables, since the seams between sections are common trouble spots.
If you don't have a level, a smaller round object like a marble works in a pinch, though it's less precise than either method above.
What Causes a Pool Table to Go Out of Level
Tables rarely go out of level from one dramatic event. It's almost always gradual, and usually traces back to one of these:
Floor settling. Houses shift over time, especially in the first few years after construction or after seasonal freeze-thaw cycles. A floor that was flat when the table was installed may not be flat five years later.
Humidity and temperature changes. Wood frames and subfloors expand and contract with moisture levels. This is especially relevant in the Pacific Northwest, where humidity swings between the wet season and summer can be significant.
Loosening leveling hardware. The shims or leveling bolts beneath the slate can shift slightly with vibration and use over years of play, even without any external cause.
An improper original setup. If a table wasn't leveled correctly the first time, whether by a mover, a previous owner, or a DIY installation, it may have never actually been level to begin with, even if it seemed fine at first glance.
A table that was moved. Any time a table is disassembled and reassembled, whether professionally or not, the leveling process has to happen again from scratch. A table that played level in its old location isn't guaranteed to play level in a new one, even on what looks like a similar floor.
How Pool Tables Actually Get Leveled
This is where a lot of misconceptions come in. Leveling a pool table doesn't mean adjusting the legs, the way you might level a wobbly kitchen table. The legs support weight; they don't fine-tune the playing surface. Leveling happens underneath the slate itself.
On most tables, this involves precise shims, paper-thin spacers, or leveling bolts placed beneath each section of slate to bring it into a perfectly flat plane. On three-piece slate tables, this has to be done section by section, and then the seams between sections need to be checked and adjusted so there's no step or gap where they meet. Getting this right requires patience: even a small adjustment in one spot can throw off the reading somewhere else on the table, so it's an iterative process rather than a one-and-done fix.
Machinist-grade levels, capable of detecting deviations far smaller than a standard carpenter's level would catch, are typically used for this kind of precision work. Once the slate itself is level, the seams between sections are sealed (commonly with beeswax or a slate seam filler) to create a smooth, continuous surface with no lip or gap that a ball could catch on.
Common Mistakes When Trying to Level a Table Yourself
Leveling looks simple in theory, which leads a lot of people to attempt it without realizing how much can go wrong:
Adjusting the legs instead of the slate. This might make the table sit flat on the floor, but it does nothing for the actual playing surface and can even make things worse.
Leveling only one section on a three-piece table. Fixing the center section without checking the outer two just moves the problem instead of solving it.
Ignoring the seams. A table can have three perfectly level slate sections and still play wrong if the seams between them aren't flush.
Using shims that shift over time. Improvised materials like folded cardboard or wood scraps might get a table close to level temporarily, but they compress or move with use, so the problem tends to come back within months.
Not rechecking after cloth installation. Cloth adds a thin layer that can slightly change how a level reads. It's worth a final check once everything is reassembled.
When to Call a Professional
A very minor, one-corner issue might be something you can address yourself if you're comfortable working carefully under the slate. But a few situations call for professional attention:
The table is unlevel across multiple sections or seams
You've tried adjusting it and the problem keeps coming back
The table was recently moved and hasn't played right since
You notice a gap, step, or misalignment at the seams between slate pieces
You're not confident working with slate, which is heavy and can crack under improper handling
Slate leveling is delicate, physical work, and getting it wrong doesn't just fail to fix the problem, it can occasionally introduce new ones, like a chipped seam or a table that's level in the wrong plane entirely.
Get Your Table Leveled Right
If your table isn't playing the way it should, NW Billiard Services can assess whether leveling, a seam issue, or something else is behind it, and correct it properly the first time. Call 360-686-9059 or reach out through our contact page to get started. Our pool table setup and repair services both include precise leveling as part of the process.
Frequently Asked Questions
How often does a pool table need to be releveled?
There's no fixed schedule. Tables in stable environments can stay level for years, while others may need attention sooner due to flooring or humidity changes. If you notice a consistent roll toward one area, that's the signal to check it, not a calendar date.
Can I level a pool table by adjusting the legs?
No. The legs support the table's weight, but leveling the playing surface happens through shims or leveling bolts placed under the slate itself.
Does moving a pool table always throw off the leveling?
Yes, in the sense that leveling has to be redone any time a table is reassembled, even in a similar-looking space. The slate has to be releveled from scratch as part of a proper setup, not just checked.
What tools do I need to check if my table is level?
A carpenter's level or a dedicated pool table spirit level is the most reliable option. A pool ball placed on the surface is a quick, informal way to spot a problem, but it won't tell you how significant the issue is.
My table is unlevel in just one corner. Is that a simple fix?
Sometimes, but it can also be an early sign of a shifting floor or worn leveling hardware rather than an isolated issue. If a small adjustment doesn't hold over time, it's worth having it looked at.
