Wood Glue Coverage Calculator (Ounces per Joint Area)

A glue-up that runs out of glue halfway is a bad afternoon, and a gallon that goes off in the bottle is wasted money. This calculator turns your joints (count, length and width) or a known glue surface into fluid ounces and millilitres, using the spread rate the manufacturer publishes, plus an allowance for squeeze-out and what stays on the brush. It suggests the smallest bottle that covers the job.

Wood glue coverage calculator

How it works

Glue surface = joints × length × width (one face of each joint; glue is spread on one face, or thinly on both to the same total)
Gallons = surface in sq ft ÷ spread rate (Titebond: about 250 sq ft per gallon for a 6 mil film)
To buy = gallons × 128 fl oz × (1 + extra)

250 sq ft per gallon is 0.5 fl oz per square foot, or about 0.0035 oz per square inch. An 8 oz bottle covers roughly 16 sq ft of joint before squeeze-out.

Worked example

Gluing up a tabletop from seven boards, 36 in long and 3/4 in thick, so six edge joints:

Measure by: Number of joints and their size
Number of glue joints: 6
Joint length: 36 in
Joint width (edge or face): 0.75 in
Spread rate: 250 sq ft per gallon
Extra for squeeze-out and spreading: 25%

The calculator gives:

Glue needed: 0.7 fl oz (21 ml)
Smallest bottle that covers it: 4 oz
Glue surface: 162 sq in (1.13 sq ft)
Film only, before the extra: 0.6 fl oz at 250 sq ft per gallon

The joints total 162 sq in, which needs only 0.6 fl oz of glue as a film and 0.7 fl oz with 25% extra. A 4 oz bottle does the whole top many times over. Laminating two 24 × 48 in panels face to face is a different story: 8 sq ft of surface takes about 5 fl oz.

Notes and limits

The spread rate is for a continuous 6 mil film. Porous end grain and rough sawn faces drink more; size end grain with a thinned coat first.
Squeeze-out is normal and shows the joint is not starved; a line of small beads along the joint is about right.
PVA glue has a shelf life of a year or two and thickens or goes stringy when old. Buy the size you will use.
Epoxy and polyurethane glues have different spread rates; use the maker’s figure in the spread-rate box.
Cold shop, fast-setting glue and big panels: work in halves so the first joint is not skinned over before the clamps go on.

Frequently asked questions

How much wood glue do I need?

About half a fluid ounce per square foot of joint at the usual spread rate of 250 sq ft per gallon. Six 36 in edge joints in 3/4 in stock need under an ounce.

How many square feet does a gallon of wood glue cover?

Titebond lists about 250 sq ft per gallon at a 6 mil film. A 16 oz bottle covers about 31 sq ft.

Should I put glue on both sides of the joint?

A thin coat on both faces wets the wood better and is what many makers recommend; the total glue used is about the same as one heavier coat.

How much glue for a cutting board?

A 12 × 18 in edge-grain board with twelve 18 × 1-1/2 in joints has about 324 sq in of joint: about 1.5 fl oz with extra.

Does wood glue go bad?

Yes. Most PVA glues are good for one to two years from manufacture, less if frozen. If it is stringy or lumpy, replace it.

Sources

Titebond III Ultimate Wood Glue product page: minimum required spread approximately 6 mils or 250 square feet per gallon

Last reviewed: 26 September 2026. The calculation is covered by automated tests with known answers taken from the sources above. Found an error? Please let us know.