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Rim Board Linear Footage Calculator

Calculate total rim board length needed around a floor perimeter, including waste allowance.

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 2026-08-26 · v1.0.0

Market
Imperial · sales tax
32.81 ft26.25 ft
Schematic, drawn to the proportions you entered — not to scale on screen.
Who is doing the work?

Waste is set to 5% by hand. Pick a tier above to replace it, or keep your own figure.

Rim board needed

124.02 ft

High confidence
Perimeter (no waste)
118.11 ft

Running these inputs gives 37.8 as the rim board needed. Perimeter (no waste) carries the most weight in this calculation, at 36 m. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

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

  • Rim board runs the full perimeter of the floor framing at each level; total length = perimeter × (1 + waste factor)

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 rim board length equal the building perimeter?
Rim board (also called band board or box beam) closes off the end of the floor joists and runs continuously around the full perimeter of the floor framing at each level.
How much waste allowance should I use?
This depends on stock board lengths and how many corners and splices the layout requires — a 5% allowance is a common starting point, but longer perimeters with more corners may need more.
Does this account for openings like stair wells?
No — this calculates the outer perimeter only. Subtract or adjust separately for any interior floor openings that don't need perimeter rim board.