🌡️ GPM Calculator

Calculate Gallons Per Minute flow rate through pipes

🔢 Input Parameters

Pipe Inside Diameter

Water Velocity

Typical range: 3-8 ft/s for supply, 2-4 ft/s for drainage

📐 Results

Flow Rate

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Gallons Per Minute (GPM)

Enter values and calculate

📚 How GPM Calculations Work

The GPM formula uses the continuity equation and unit conversions:

GPM = (π × D² × V × 3.87) / 4

Where D is diameter in inches and V is velocity in ft/s

⚡ Typical GPM Requirements

Kitchen faucet: 2-3 GPM
Bathroom faucet: 1-2 GPM
Shower: 2-3 GPM
Toilet: 1-3 GPM (tank fill)
Washing machine: 3-5 GPM
Dishwasher: 2-4 GPM
Garden hose: 5-8 GPM