Wood Glue Coverage Calculator

A properly glued edge joint in solid wood is stronger than the wood beside it, which is why a board that has been glued up and then broken usually breaks somewhere other than the glue line. Getting there takes the right amount of glue, and the window is wider than beginners fear but narrower than they usually apply.

Too little and the joint is starved, which fails under load. Too much and you get squeeze-out that wastes product, takes ages to clean up, and seals the surrounding grain so stain will not take there.

How much you actually need

The standard woodworking recommendation is to apply glue to both mating surfaces of a joint, so a joint 18 inches long and 1.5 inches wide is 27 square inches of contact but 54 square inches of glue.

Spread as a thin, even coat, that runs about 6 to 8 square inches per millilitre, which is roughly 175 to 235 square inches per fluid ounce. Aim for a thin translucent film rather than a thick opaque bead, and use a brush, roller or notched spreader instead of the bottle nozzle.

This calculator works from the heavy end of that range, 175 square inches per fluid ounce. Titebond’s own published figure is more generous, around 250 square feet per gallon, which works out near 280 square inches per fluid ounce. That assumes a thinner film than most people actually spread, and running out of glue halfway through a glue-up with the clamps already on is a worse outcome than having a third of a bottle left over.

Worked example. Eight edge joints, each 18 inches long on 1.5-inch stock, in Titebond Original: 18 × 1.5 × 2 surfaces = 54 square inches per joint, × 8 joints = 432 square inches. 432 ÷ 175 = 2.47 fluid ounces, or about 73 ml. One 8 oz bottle covers it three times over, which is the usual answer for furniture-sized work. Glue is rarely the thing you run short of.

PVA Glue (Titebond I)

PVA (polyvinyl acetate) glues like Titebond Original are the most widely used wood glues. They are water-based, easy to clean up with water, and provide very strong glue lines in interior applications. PVA glue is NOT waterproof. Do not use it for outdoor furniture or anything exposed to moisture. Open time (working time) is approximately 5–10 minutes; clamp time is 30–60 minutes; full cure is 24 hours.

Titebond II (Water Resistant)

Titebond II is cross-linking PVA with water resistance suitable for outdoor furniture that is not constantly wet. It passes the ANSI/HPVA Type II water resistance test. Coverage and working time are similar to Titebond I, but it requires longer clamping in cold temperatures.

Gorilla Glue (Polyurethane)

Polyurethane glue foams as it cures, expanding to fill gaps. It is fully waterproof, bonds wood to wood, wood to metal, stone, and many other materials. Use it sparingly. It expands 3-4x, and too much of it makes a mess that is hard to clean off. Clamp time is 1–2 hours; full cure is 24 hours. Slightly moisten one surface to activate the glue.

Epoxy

Two-part epoxy provides the strongest bond of any woodworking adhesive. It is completely waterproof, resists solvents, and can fill large gaps. Epoxy is typically used for specialty applications: repairs, end-grain joints, and bonding difficult species like oily tropical hardwoods (teak, ipe). Coverage is similar to other glues but cost is higher. Clamp time depends entirely on which hardener you bought: a 5-minute epoxy is done in under an hour, while a standard slow hardener wants 6 hours in the clamps and a full day before you stress the joint. Warm the shop rather than the epoxy, and mix only what you can spread before it kicks.

One thing worth knowing about squeeze-out. A bead of glue squeezed out of a joint and wiped with a wet rag looks clean and is not. The water spreads a thin film of glue into the surrounding grain, it dries invisible, and it blocks stain from penetrating, so the line shows up as a pale halo the moment you finish the piece. Let squeeze-out cure to the rubbery stage, about half an hour, and pare it off with a chisel.