Gas Pipe Sizing Calculator
Size gas piping for natural gas and propane per fuel gas code requirements.
Natural Gas Capacity (CFH)
0.5" WC pressure drop, schedule 40 iron pipe
| Pipe Size | 10 ft | 30 ft | 50 ft | 100 ft |
|---|---|---|---|---|
| 1/2" | 175 | 100 | 78 | 55 |
| 3/4" | 360 | 210 | 160 | 115 |
| 1" | 680 | 390 | 305 | 215 |
| 1-1/4" | 1,400 | 810 | 630 | 440 |
| 1-1/2" | 2,100 | 1,200 | 940 | 660 |
| 2" | 3,950 | 2,280 | 1,780 | 1,250 |
Typical Appliance Loads
| Appliance | BTU/hr Input |
|---|---|
| Gas Furnace | 60,000-120,000 |
| Tank Water Heater | 30,000-50,000 |
| Tankless Water Heater | 150,000-200,000 |
| Gas Range | 40,000-75,000 |
| Gas Dryer | 20,000-25,000 |
| Fireplace (vented) | 25,000-40,000 |
| Pool Heater | 150,000-400,000 |