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Roof Ridge Cap Calculator

Estimate how many bundles of ridge cap shingles you need for a roof's ridge and hip lines.

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
39.37 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Ridge cap bundles needed

2 bundles

High confidence
Ridge/hip length (with waste)
43.31 linear ft

Running these inputs gives 2 as the ridge cap bundles needed. 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

  • A standard bundle of ridge cap shingles covers approximately 33 linear ft, per common asphalt shingle manufacturer specs

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

Can I use regular shingles cut down instead of dedicated ridge cap?
Some installers do cut standard 3-tab shingles into ridge caps, but purpose-made ridge cap shingles are thicker and pre-bent for better weathering at the ridge — most manufacturers recommend them, especially for architectural shingle roofs.
Does this include the ridge vent itself?
No — this is cap shingle material only, installed over a ridge vent if one is present. Estimate the ridge vent material separately by the same ridge length.
Why does coverage per bundle vary between products?
Ridge cap bundle coverage depends on the shingle brand and style — always check your specific product's coverage rating on the wrapper before finalizing your order.