Gas Pipe Sizing Calculator
Find the minimum gas pipe diameter for your BTU load and run length per IFGC Table 402.4.
Sum of all appliance BTU/hr ratings on this pipe segment
Total length from meter or regulator to the farthest appliance
Sizing uses IFGC Table 402.4(2): natural gas, 2 psi inlet, 0.3 psi pressure drop. Common for runs over 50 ft or high-demand commercial applications.
Minimum Pipe Diameter0.75in
3/4-inch pipe per IFGC Table 402.4(2) -- natural gas, 2 psi supply
Common Appliance BTU/hr Reference
| Appliance | Typical BTU/hr |
|---|---|
| Range/cooktop | 50,000-65,000 |
| Water heater | 30,000-50,000 |
| Furnace (100k BTU) | 100,000 |
| Fireplace insert | 25,000-75,000 |
| Dryer | 20,000-35,000 |
| Boiler | 80,000-200,000 |
Reference: IFGC Table 402.4(2) -- Natural gas pipe sizing, 2 psi inlet, 0.3 psi pressure drop