Caulk Calculator

Caulk is sold by volume, so how many tubes a job takes depends on the width and depth of the joint as much as its length. Enter the joint size, the run in feet and the tube size you are buying, and this returns the cubic inches of sealant, the number of tubes and how far one tube actually goes. A second tab sizes the joint instead: the sealant depth for a given width, the backer rod behind it and the tubes that depth needs. It counts material only, and says nothing about which sealant belongs in the joint.

Calculator Type
Units
Every box below and every figure in the answer follows this.

Width, depth and how long the joint runs. The tube count comes from the volume, so the depth matters as much as the width.

The gap across the face. A quarter inch is 0.25 in, or 6.4 mm.
How far back the sealant goes, to the backer rod if there is one.
In fluid ounces, or in millilitres if you picked metric above.
What is left in the nozzle, the tooled-off excess and the tube that skins over between sessions.
Widget
Units
Every box below and every figure in the answer follows this.

Give the width of the gap and the run. This sizes the sealant depth and the backer rod behind it, then counts the tubes that depth needs.

The gap the sealant has to bridge.
In fluid ounces, or in millilitres if you picked metric above.
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