Flow Rate Calculator for Spray Nozzles
Calculate the flow rate based on nozzle diameter and pressure.
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Spray nozzle performance depends on flow rate and pressure. Understanding these values ensures you choose the right nozzle for your application — whether you need precise irrigation, efficient cleaning, or consistent coating.
The NozzlePro Flow Rate Calculator helps you quickly determine flow rates for spray nozzles in both GPM (gallons per minute) and L/min (liters per minute).
How to Use the Flow Rate Calculator
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Enter Nozzle Orifice Diameter
Input the nozzle diameter to define the opening size for liquid flow. -
Select Pressure
Choose the operating pressure in PSI or bar. Pressure influences how much liquid passes through the nozzle. -
Calculate Flow Rate
The calculator provides results in:-
GPM (Gallons per Minute)
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L/min (Liters per Minute)
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This simple process helps you compare nozzle sizes, pressures, and flow outputs without needing complex charts.
The Science Behind Flow Rate
Flow rate is determined by the relationship between orifice size and pressure:
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Larger orifice + higher pressure = greater flow rate.
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Smaller orifice + lower pressure = reduced flow rate.
The standard formula for nozzle flow is:
Q = K × √P
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Q = Flow rate (GPM or L/min)
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K = Flow coefficient (depends on nozzle size/orifice)
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P = Pressure (PSI or bar)
This equation shows that flow rate increases with the square root of pressure, not linearly — doubling the pressure does not double the flow.
Why Flow Rate Matters
Choosing the right flow rate ensures your spray system is:
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Efficient – Reduces water and chemical waste.
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Accurate – Delivers the correct volume for coating, rinsing, or irrigation.
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Cost-Effective – Helps optimize pumping energy and resource use.
Applications
The Flow Rate Calculator is used across industries:
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Agriculture – Proper irrigation and fertilizer spraying.
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Manufacturing – Cooling, rinsing, and degreasing.
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Food & Beverage – Sanitation and tank cleaning.
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Construction – Concrete curing, dust suppression.
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Environmental – Pollution control and misting systems.
Try the Flow Rate Calculator
Select your nozzle diameter and pressure, and instantly see the flow rate in GPM and L/min. With NozzlePro’s Flow Rate Calculator, you’ll save time, improve accuracy, and make smarter nozzle selections for your application.