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What’s the speed of the water coming out the nozzle of my pressure washer? [FAQ011]

pressure washer speed

Today we will look at the speed of the water coming out of the pressure washer nozzle.

A pressure washer with a flow rate of 3 GPM using a typical 0-degree nozzle with an orifice size of 0.052″ (1.32mm) has a water speed out the nozzle of 243 mph (391 km/hr).

Speed of pressure washer water graphic


  • 3 gallons per minute pressure washer flow rate is 11.3562 litres/minute is 189.25 cm3/second
  • Orifice size is 0.132 cm
  • Divide the flow rate by the orifice size squared to get units of cm/sec
  • Convert cm/sec to miles per hour and kilometres per hour.

About the author: Jamey has been testing and reviewing top pressure washers for 7 years. He worked as a commercial pressure washer at a rendering plant for 3 years and all up has been using commercial and residential pressure washers for 15+ years. He is also a mechanical engineer and while working in the mining industry designed several turn-key light industrial vehicle wash pads.