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Fuel Gas Pipe Capacity Calculator

Calculate a fuel gas pipe's volumetric flow capacity at a maximum allowable gas velocity.

Computed in your browser — nothing you enter is uploaded. Figures are presented in United States units and terminology, and each formula’s basis is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

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

Pipe flow capacity

10.9 m³/hr

Check your inputs

This is a simplified velocity-based capacity screening check — actual fuel gas pipe sizing per NFPA 54/IFGC also depends on allowable pressure drop, pipe length, and fitting losses, and must use the code's official sizing tables for final design.

Running these inputs gives 10.9 m³/hr as the pipe flow capacity. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States — pick a different market above and the figures re-cast accordingly.

Add the equipment this sizes

This result is a specification — 10.9 m³/hr — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

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 — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.

Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Regulatory standards & verification citations

  • Capacity = pipe cross-sectional area × maximum allowable gas velocity, a simplified velocity-based screening check consistent with NFPA 54/IFGC gas pipe sizing principles (which also account for pressure drop and pipe length via sizing tables)

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Frequently asked questions

Is this the same as official NFPA 54/IFGC gas pipe sizing?
No — this is a simplified velocity-based screening check only. Actual fuel gas pipe sizing per NFPA 54/IFGC also depends on allowable pressure drop, pipe length, and fitting losses, and must use the code's official sizing tables for final design.
Why does velocity matter for fuel gas piping?
Limiting gas velocity (commonly to around 6 m/s for fuel gas) helps control noise and erosion in the piping system.
Should I use nominal or actual internal pipe diameter?
Use the pipe's actual internal diameter, not its nominal size, since cross-sectional area is calculated directly from this value.