Gas Pipe Sizing Calculator
Size gas piping per IFGC/NFPA 54 fuel gas code
Gas Supply
Appliance Load
Pipe Run
Gas Pipe Sizing Results
Minimum Pipe Size
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CFH Capacity
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Total BTU Load
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Required CFH
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Equivalent Length
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Pressure Drop
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Code Reference: IFGC/NFPA 54 Chapter 4. Always verify with local gas utility requirements.
Common Appliance BTU Ratings
| Appliance | BTU/hr Range |
|---|---|
| Furnace | 40,000 - 200,000 |
| Water Heater (Tank) | 30,000 - 75,000 |
| Water Heater (Tankless) | 120,000 - 200,000 |
| Range/Oven | 35,000 - 75,000 |
| Clothes Dryer | 20,000 - 35,000 |
| Gas Fireplace | 20,000 - 60,000 |
| Pool Heater | 100,000 - 400,000 |
| Outdoor Grill | 30,000 - 60,000 |
Heating Values
Natural Gas: ~1,030 BTU/cu ft
Specific gravity: 0.60
Propane (LP): ~2,500 BTU/cu ft
Specific gravity: 1.52
Gas Pipe Capacity - Natural Gas (0.5" WC drop)
Maximum CFH capacity for Schedule 40 steel pipe:
| Pipe Size | 10 ft | 20 ft | 30 ft | 50 ft | 75 ft | 100 ft |
|---|---|---|---|---|---|---|
| 1/2" | 175 | 120 | 97 | 73 | 59 | 50 |
| 3/4" | 360 | 250 | 200 | 152 | 121 | 103 |
| 1" | 680 | 465 | 375 | 285 | 225 | 195 |
| 1-1/4" | 1,400 | 950 | 770 | 580 | 465 | 400 |
| 1-1/2" | 2,100 | 1,460 | 1,180 | 890 | 710 | 615 |
| 2" | 3,950 | 2,750 | 2,200 | 1,670 | 1,340 | 1,150 |