All calculations update in real time as you type. Results are for estimation purposes — always verify critical values with a licensed engineer.
GPM
inches
Velocity—ft/s
Velocity—ft/min
Pipe Area—in²
ft/s
inches
cP
Water ≈ 1 cP · Oil ≈ 50–200 cP
Reynolds Number—
Flow Regime—
ft
inches
ft/s
—
Water = 1.0
cP
Pressure Drop—PSI
Pressure Drop—lb/ft²
Friction Factor (f)—
Reynolds Number—
ft/s
inches
Flow Rate—GPM
Flow Rate—L/min
Flow Rate—m³/h
0 gpm =—lpm
ft
inches
Volume—gallons
Volume—liters
Volume—ft³
—
From valve manufacturer's datasheet
PSI
—
Water = 1.0
Flow Rate—GPM
Flow Rate—L/min
°F
Enter °F to convert to all other scales
Celsius—°C
Kelvin—K
Rankine—°R
ft/s
seconds
ft
Distance from valve to nearest reservoir
Surge Pressure—PSI
Critical Closure Time—sec
Closure Type—
GPM
ft
—
%
Brake Horsepower—BHP
Water Horsepower—WHP
Power—kW
PSI
inches
inches
—
Flow Rate—GPM
Flow Rate—ft³/s
Beta Ratio (d/D)—
Discharge Coeff (Cd)0.61 (typical)
PSI
inches
—
Exit Velocity—ft/s
Flow Rate—GPM
Point 1 (upstream)
ft/s
PSI
ft
Point 2 (downstream)
ft/s
ft
—
Pressure at Point 2—PSI
ft
°F
Expansion—inches
Expansion—ft
Coeff. of Expansion (α)6.5 × 10⁻⁶/°F
Outer Diameter (OD)—inches
Wall Thickness—inches
Inner Diameter (ID)—inches
Flow Area—in²