MBE / HUB-Certified Texas MEP
NFPA 54 Gas Pipe Sizer
Quick lookup for minimum natural-gas pipe diameter per NFPA 54 / IFGC longest-length method — Schedule 40 black steel, 0.5 psi inlet, 0.5" w.c. drop, 0.60 specific gravity. Enter total demand and longest run; we return the smallest pipe size that handles the load.
Sum of appliance input ratings. Convert BTU/h to CFH by dividing by ~1,030.
Distance from gas meter / regulator to the most distant appliance.
CSST, copper, 2 psi tables coming soon.
Minimum pipe size
3/4"
Basis: 500 CFH at 50 ft → 3/4" (capacity 151 CFH at the 50-ft length row)
Round up to the next stocked size. Branch sizing requires separate calculation per AHJ.
~30%
Of restaurant fit-out gas-piping reviews we see have at least one undersized branch. Most common: griddle plus fryer plus combi-oven on a 3/4" branch that needs 1".
Need this gas piping sealed for permit?
Pyra Engineering produces sealed gas isometrics for restaurants, medical, retail and industrial across TX & FL. Quote in 1 business day.
Important. This tool returns the prescriptive longest-length result for the standard table only. It does not handle: medium-pressure systems, CSST, copper, branch-by-branch sizing, multiple meters, regulator selection, or AHJ-specific amendments. Permit-ready gas isometrics require sealed drawings from a licensed engineer.