How to Use the Calculator
- Enter the diameter of your hose in inches (typically 3/4", 1", 1.25", etc.)
- Enter the length of the hose in feet
- Enter the pressure rating of the hose in PSI
- Optionally, enter the friction loss value if known
- Click the "Calculate" button to see the results
Understanding the Results
- Flow Rate (gpm): The volume of water that can flow through the hose per minute
- Pressure Drop (PSI): The amount of pressure lost as water flows through the hose
- Hose Efficiency: The percentage of pressure that is effectively used to move water, rather than being lost to friction
Principle Behind the Calculation
The calculator uses the Hazen-Williams equation, which is commonly used for calculating water flow through pipes and hoses:
Q = (π × D² × √ΔP) / 4 × 0.0283
Where:
- Q = Flow Rate (gpm)
- π = 3.14159
- D = Hose Diameter (inches)
- ΔP = Pressure Drop (PSI)
- 0.0283 = Conversion factor from cubic feet per second to gallons per minute
Practical Applications
This calculator can be used for:
- Designing irrigation systems
- Planning fire protection systems
- Configuring water supply systems for construction sites
- Ensuring adequate water flow for industrial processes