Tools
Nozzle Flow Rate Calculator
Work out how much a nozzle will spray at a different pressure, or the pressure you need for a target flow.
How the calculation works
For hydraulic (single-fluid) nozzles spraying water, flow rate changes with the square root of pressure:
Q2 = Q1 × √(P2 ÷ P1)
Enter a known flow at a known pressure (from the product datasheet) and the new pressure. Doubling the flow needs four times the pressure. Results are a guide for water at room temperature; viscous liquids, air atomizing nozzles and worn tips behave differently.
Does a bigger orifice always give more flow?
At the same pressure, yes — a larger orifice passes more liquid. It also changes droplet size and spray angle, so check the full datasheet.
Why does my nozzle spray less than the datasheet?
Pressure at the nozzle is often lower than at the pump because of pipe losses, partly blocked strainers or undersized hoses. Measure pressure close to the nozzle.
Can I use this calculator for air atomizing nozzles?
No. Air atomizing nozzle flow depends on both air and liquid pressure. Use the manufacturer performance table or ask our team.
Need a technical match?
Not sure which nozzle fits your process?
Send us your duty — liquid, flow, pressure and spray distance — and we will shortlist the right nozzles and send you a quotation.