Caulk Tube Size to Linear Feet Coverage Converter

Caulk coverage depends on two factors: the volume of caulk in the tube and the cross-sectional area of the bead you apply. A thinner bead covers more linear distance, while a thicker bead covers less.

The formula for caulk coverage: Linear feet = Tube volume (cubic inches) / Bead cross-section area (square inches)

For a triangular bead (the most common shape when filling a corner joint): Cross-section area = 0.5 x width x depth

For a round bead (surface sealing): Cross-section area = pi x (radius)^2

Standard caulk tube sizes and their volumes:

• 2.8 oz squeeze tube: approximately 5.1 cubic inches. These small tubes are ideal for touch-up work and small repairs. They are easier to control for detail work around windows and trim.
• 5.5 oz squeeze tube: approximately 10 cubic inches. A mid-size option for moderate jobs like sealing around a single bathtub or a few windows.
• 10.3 oz cartridge (standard): approximately 18.8 cubic inches. This is the most common size, designed for standard caulking guns. It is the go-to choice for most home improvement projects.
• 20 oz sausage pack: approximately 36.5 cubic inches. Used with sausage-pack dispensers, these are popular with professionals for large jobs because they produce less waste than cartridges.
• 29 oz cartridge (quart): approximately 52.9 cubic inches. The largest standard cartridge size, used for high-volume commercial applications.

Typical bead widths and coverage for a 10.3 oz cartridge (triangular bead, equal width and depth):

• 1/8 inch bead: approximately 201 linear feet (61.3 m)
• 3/16 inch bead: approximately 89 linear feet (27.1 m)
• 1/4 inch bead: approximately 50 linear feet (15.2 m)
• 3/8 inch bead: approximately 22 linear feet (6.7 m)
• 1/2 inch bead: approximately 13 linear feet (4.0 m)

Notice how fast that falls. Doubling the bead width from 1/4 to 1/2 inch does not halve the coverage, it quarters it, because the cross-section is an area and areas go with the square. That is the single most useful thing on this page: if you are running out of caulk, the fix is almost always a smaller nozzle cut rather than another trip to the store.

Round beads eat far more caulk than triangular ones

A triangular bead fills a corner and its cross-section is half the width times the depth. A round bead sits on a flat surface and its cross-section is a full half-circle, which for the same nominal width is about 57 percent larger. Same tube, same nozzle, 36 percent less distance covered. The calculator below lets you pick the profile because the difference is big enough to change how many tubes you buy.

Cutting the nozzle sets the width, and you cannot undo it

The taper on a cartridge nozzle means the further down you cut, the wider the opening. Start smaller than you think. A 45-degree cut at the first ring is roughly an eighth of an inch; the third ring is closer to a quarter. You can always cut more off. Cut too far on the first tube of a job and you have committed to burning through twice the caulk on every joint.

Practical tips for estimating caulk needs: Always buy 10-20% more caulk than your calculation suggests. Real-world joints are rarely perfectly uniform, and some caulk is always wasted in the tip, left in the tube, or used for test beads. For a standard bathroom recaulk job (bathtub perimeter plus fixtures), plan on using 1 to 2 standard 10.3 oz cartridges.

Caulk vs sealant: While often used interchangeably, caulk is typically rigid when cured (best for stationary joints like baseboards), while sealant remains flexible (better for joints that expand and contract, like where a bathtub meets a wall). Silicone sealants offer the best flexibility and water resistance, while latex caulk is easier to apply and paintable.

Shelf life: Unopened caulk tubes typically last 12-24 months. Once opened, use within a few weeks for best results. Squeeze tubes reseal better than cut cartridge tips.