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Caulk & Sealant Calculator

Estimate how many tubes of caulk you need to seal the exterior trim around doors and windows.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-25 · v1.0.0

Market
Imperial · sales tax
2.83 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Caulk tubes needed

1 tubes

High confidence
Caulk bead length (with waste)
20.9 linear ft

At the values currently entered, the caulk tubes needed works out to 1. Note that number of openings sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • A standard 10.1 oz tube of caulk covers approximately 25 linear ft when applied as a 1/4 in bead

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Is this the same as the Weatherstripping Calculator?
No — weatherstripping seals the movable gap between a door/window sash and its frame, while caulk seals the fixed gap between the window/door frame's exterior trim and the siding. Most openings need both.
What type of caulk should I use outdoors?
A paintable, exterior-rated caulk (siliconized acrylic or polyurethane) is standard for trim-to-siding gaps — pure silicone is very durable but usually can't be painted over.
Does bead size affect coverage?
Yes significantly — a wider bead (for larger gaps) uses much more caulk per linear ft than the standard 1/4 in bead this estimate assumes.