Water Meter Sizing Calculator
Size water meters per AWWA M22 and UPC/IPC
Fixture Count
Add irrigation GPM directly if known
System Parameters
Recommended Meter Size
Meter Size
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Pressure Loss at Peak
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Total WSFU
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Peak Demand
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Safe Operating Range
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Minimum Service Line
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AWWA Guideline: Select meter where peak demand is 50-75% of maximum safe flow to ensure accuracy and longevity.
Water Meter Capacities
| Meter Size | Safe Max (GPM) | Peak Max (GPM) | Pressure Loss* |
|---|---|---|---|
| 5/8" | 15 | 20 | 7 PSI |
| 3/4" | 25 | 30 | 7 PSI |
| 1" | 40 | 50 | 9 PSI |
| 1-1/2" | 80 | 100 | 11 PSI |
| 2" | 130 | 160 | 11 PSI |
| 3" | 280 | 350 | 13 PSI |
| 4" | 500 | 630 | 13 PSI |
Meter Type Selection
Displacement
5/8" - 2" typical
Most accurate
Residential standard
Compound
2" - 6" typical
Variable flow
Commercial/industrial
Turbine
1-1/2"+ typical
High flow rates
Fire service combined
Ultrasonic
All sizes
No moving parts
Smart metering