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Gas Pipe Sizing Calculator
Calculate correct pipe size per BS 6891:2015
Installation Details
Gas Type
Natural Gas (21 mbar)
LPG Propane (37 mbar)
LPG Butane (28 mbar)
Pipe Material
Copper (BS EN 1057)
Steel (BS 1387)
Appliance Heat Input (kW Gross)
Pipe Length (metres)
Number of Elbows
Number of Tees
Number of Bends
Number of Sections (split by tees)
1 Section (Direct run)
2 Sections
3 Sections
4 Sections
Calculate Pipe Size
BS 6891:2015 Standard:
Maximum pressure loss: 1 mbar for Natural Gas, 2.5 mbar for LPG
Fitting equivalent lengths: Elbow 0.5m, Tee 0.5m, Bend 0.3m
Calculation Results
Gas Rate:
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Actual Length:
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Fittings Equivalent:
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Total Equivalent Length:
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Minimum Pipe Size Required
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Pressure Drop:
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Alternative Pipe Sizes