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Weatherstripping Calculator

Estimate the linear feet of weatherstripping needed to seal door and window openings.

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.

Weatherstripping needed

3 x 10 ft rolls

High confidence
Weatherstripping needed (with waste)
20.9 linear ft

For the dimensions entered, expect a weatherstripping needed of 3 x 10 ft rolls. 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. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

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

  • Weatherstripping seals the full perimeter of an opening (all four sides, since air sealing includes the threshold): linear ft = 2 x (height + width) per opening

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

Why does this use the full perimeter, unlike casing which skips the door's bottom?
Air sealing needs to close off the whole gap around the opening, including the threshold (typically with a door sweep) — the goal is different from casing, which is purely cosmetic trim.
Do different weatherstripping types (foam, V-strip, felt) use different amounts?
The linear footage needed is the same regardless of type, since it's based on the opening's perimeter — but door sweeps and thresholds are usually sold separately by width, not by the roll length used for the sides and top.
How do I know if my weatherstripping needs replacing?
Common signs are visible daylight around a closed door, a noticeable draft, or a dollar bill pulling out easily when closed in the door — worn, cracked, or compressed weatherstripping is a common source of household air leakage.