Carom Billiard Table Size: Three-Cushion Dimensions

TL;DR: An international three-cushion match table has a playing area of 2.84 m × 1.42 m — a strict 2:1 ratio, often called the 10-foot carom table. Smaller club tables run around 2.30 m × 1.15 m. The bed is slate, usually electrically heated to roughly 30–40 °C, dressed in fast napless worsted wool, fitted with low carom-profile cushions and pocketless, with three diamonds inset along each long rail.

The match playing surface: 2.84 m × 1.42 m

The defining number in carom is the playing area — the rectangle measured between the cushion noses, not the outer slate or the cabinet. On an international three-cushion match table that rectangle is 2.84 m × 1.42 m, and it is no accident that 2.84 is exactly twice 1.42. That clean 2:1 ratio is what makes mirror-image rebound geometry and diamond counting work the same on both halves of the table, and it is why players call this the 10-foot carom table.

Not every table is match size. Clubs and homes often install a smaller bed for space and budget reasons:

• Match / international: 2.84 m × 1.42 m playing area — the size used for serious three-cushion competition.
• Small / club: roughly 2.30 m × 1.15 m, again holding the same 2:1 proportion so the geometry scales down cleanly.

Because the proportion is preserved, the aiming logic you learn on a small table transfers to a match table — the angles are identical; only the absolute distances change.

The slate bed — and why it is heated

Under the cloth sits slate, precision-ground flat, typically in multiple pieces seamed and levelled on installation. Slate gives the dead-flat, dimensionally stable surface that fast carom play demands; anything that flexes or settles would corrupt the rebound angles the entire game is built on.

What surprises newcomers is that match carom tables are heated. An electric element warms the slate to roughly 30–40 °C, and this is not a comfort feature — it is a performance requirement:

• It keeps the cloth dry. Worsted wool absorbs ambient humidity; a damp cloth is slow and inconsistent.
• It keeps the bed fast. A warm, dry surface lets the ball carry the long distances three-cushion shots require.
• It keeps rebound consistent. Stable temperature means the cloth behaves the same in the first frame and the last, regardless of the weather outside.

The speed assumptions baked into every aiming system — including the counts you will read off the diamonds — are calibrated to a warm, dry, fast bed. That is exactly the condition a heated table maintains.

The cloth: fast, napless worsted wool

Carom is played on tightly combed worsted wool — Simonis-type cloth — that has almost no nap. The difference from a fuzzy pool cloth is dramatic: a napless worsted surface is far faster and far less directional, so the cue ball travels further for the same stroke and rebounds predictably off rail after rail.

This matters for learning, not just for pros. Multi-rail systems assume the ball will hold its line and its speed across the full length of the table. On slow, hairy cloth those assumptions break down; on fast worsted cloth over a heated bed they hold up shot after shot.

The cushions: low, fast, carom-specific

Carom rails use a carom-specific cushion profile — lower and faster than pool cushions — tuned so the ball rebounds the same way every time, even across three or more rails. Pocketless tables let the manufacturer run an unbroken cushion line around all four rails, which is part of why rebound on a carom table is so repeatable.

Predictable cushions are the whole point. In three-cushion the cue ball must strike at least three rails before the final contact, so any inconsistency in the rubber compounds over the length of the shot. The low, fast carom profile is engineered to keep that rebound clean and countable.

The balls: three, 61.5 mm, phenolic

Carom uses three balls and no pockets: two cue balls — one white, one yellow, one per player — plus a single red object ball. Modern sets are pressed phenolic resin for a hard, lively, repeatable rebound.

The large 61.5 mm diameter and the heavy, matched weight are part of the system: they give carom its characteristic carry and the consistent collision behaviour that makes the angles reliable. Worn or mismatched balls are one of the most common reasons a beginner's system counts seem to drift. For the wider rules and context, see our introduction to carom billiards.

The diamonds — and how they relate to aiming

Look along the rails and you will see inlaid markers: three diamonds inset along each long rail, plus markers at the corners. They are not decoration. They are the coordinate grid of the table, and they are the reference points the Diamond System counts from.

The idea is simple to state and powerful in practice. Each diamond is assigned a number; you read off three values and combine them with one rule:

arrival diamond = cue-ball position number − target number

Read the number under your cue ball,
read the number you want to arrive at,
subtract → that is the diamond you aim your first rail through.

Because the table is a strict 2:1 rectangle with evenly spaced diamonds, this arithmetic stays consistent across the whole bed — which is precisely why the dimensions and the diamond spacing are standardised. The diamonds turn a geometry problem into a counting problem.

Room size and installation

A match table needs more floor than its footprint suggests, because you must be able to stroke from every side. The working rule is to allow roughly a cue-length (~1.5 m) of clearance on every side of the playing surface.

• Add about 1.5 m to each dimension beyond the cabinet so a full backswing never hits a wall.
• Level the slate carefully on install — on a fast, heated bed even a slight tilt shows up as a drift in long rebounds.
• Give the heating element time to bring the bed up to temperature before play, so the cloth is dry and fast from the first shot.

How a carom table differs from a pool table

If your reference point is pool, almost every specification inverts. Briefly:

In short, a carom table is larger, pocketless, heated and faster — built so that a ball can run rail to rail and arrive exactly where the diamonds say it should.