Gas Piping & Appliance Load
Gas piping and appliance load — for planning only: total connected appliance gas load (Σ BTU/hr), gas pipe size from the load and longest run (labeled NFPA-54-style band), BTU/hr ↔ CFH conversion (nat gas ÷ 1000, propane ÷ 2516), a gas line run cost, and capacity vs allowable pressure drop. ⚠️ Gas work must be performed by a licensed professional with a permit and inspection; gas leaks are dangerous.
⚠️ Gas safety — licensed professional only: Gas work must be performed by a licensed professional. A permit and inspection are required and gas leaks are dangerous (fire, explosion and carbon-monoxide risk). This tool is for planning only — it is not a substitute for a licensed gas fitter or a code-official sign-off.
Local plumbing code governs: This sizing follows standard reference conventions (IPC / UPC / NFPA-54-style tables). Your local plumbing code and inspector govern — sizing methods, materials and permit rules vary by jurisdiction. Confirm the design with a licensed plumber and pull the required permit before you build.
Appliance Gas LoadAdd up your furnace, water heater, range and dryer to get the total household gas load in BTU/hr and CFH — the number you size a gas line from.Gas Pipe SizeFind the gas pipe size for your total BTU load and longest run with a labeled NFPA-54-style longest-length table. Gas work is for licensed pros.BTU to CFHConvert appliance BTU/hr to CFH for natural gas and propane — the cubic-feet-per-hour figure that gas pipe capacity tables use to size a line.Gas Line Run CostEstimate a gas line run cost from the length, your price per foot, fittings and labor. A planning estimate on your numbers — gas work needs a licensed pro.Capacity vs Pressure DropFind the CFH capacity of a gas pipe size and run length at a typical pressure drop, using a labeled NFPA-54-style band. Confirm with a licensed gas fitter.
Every Gas Piping & Appliance Load tool is calculated server-side — visible immediately — with its formula, a worked example and a reference table, and works on the prices you enter. Background reading is in the guides.