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BTU to Pipe Size
Pipe Size to Max BTU
Gas Pipe Calculator
Single Run
Sequential Trunk
Gas Type
Natural Gas (0.60 SG)
Propane (1.52 SG)
Meter Pressure
0.5 PSI (7" w.c.)
2.0 PSI System
5.0 PSI System
Pipe Material
Sch 40 Black Iron
CSST Tubing
Copper Tubing
Building Type
Single-Family (100% load)
Multi-Family / Shared Meter (90% diversity)
Field Length Rounding
Exact developed length
Snap to nearest 10 ft
Snap to nearest 20 ft
Appliance Load (BTU/hr)
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Straight Run Length (Feet)
90° Elbows
45° Elbows
Tees (Flow)
Valves
Required Starting Main Size
Load: 100,000 BTU/hr · 110 ft
1"
Field-Optimized Stepped Reduction Plan
Run 1" pipe for the first 45 ft off the meter, then reduce to 3/4" pipe for the remaining 55 ft.
0–45 ft (45 ft)
1"
Reduce to 3/4" pipe from 45 ft mark to 100 ft.
45–100 ft (55 ft)
3/4"
Final 10 ft drop to appliance can reduce to 1/2" flex/pipe.
100–110 ft (10 ft)
1/2"