Gas Pipe Sizing

BTU capacity by pipe size, length, gas type.

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Formula and source

Spitzglass / Weymouth public formulas with bundled gas properties; longest-length method per IFGC 2021 Section 402.4 and Tables 402.4(1)–(36).

IFGC 2021 (International Fuel Gas Code) / NFPA 54. Section 402.4 and capacity tables.

Audience

This tile is built for plumbers and the adjacent professions in the Plumbing and Gas group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.