01
Formula
Cost = (area ÷ production) × labor + chemical allowance.
Orifice = GPM × √(4,000 ÷ PSI). The pressure washer nozzle calculator uses that orifice number. Round to a tip you can buy.
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Pressure washing cost calculator and nozzle size
This pressure washing cost calculator divides the area by square feet per hour and multiplies by your labor price, then adds a chemical allowance. The pressure washing calculator is that job estimate. The pressure washer nozzle calculator is the orifice number: flow times the square root of 4,000 divided by the pressure. Prices and production are estimates you enter.
Job estimate
$320.00
Hours4.00
Nozzle orifice4.62
Flow and pressure4.00 gpm at 3,000 psi
Planning estimate from the numbers you enter. Coverage, density, waste and price are assumptions, not a supplier quote or an engineering specification.
How it works
Hours equal area divided by production. The orifice follows flow and pressure.
Two thousand square feet at 500 square feet per hour is 4.00 hours. At $75 per hour the labor is $300. A $20 chemical allowance makes the job $320. A 4 gallon per minute washer at 3,000 psi needs an orifice of 4.62. The orifice formula is gallons per minute times the square root of 4,000 divided by psi. It picks a tip size to match the pump, not a surface cleaner width. Production of 500 square feet per hour is a placeholder. Concrete, wood, and a second story do not share a rate. Type the rate your crew hits.
02
Example
2,000 square feet at 500 square feet per hour, $75 labor, $20 chemical, 4 GPM at 3,000 psi.
The pressure washing cost calculator shows 4.00 hours and $320. The orifice is 4.62. A 4.5 tip is the nearby size. The page shows the calculated number, not a catalog tip.
03
Tips
Match the tip to the pump, not the other way around.
A tip that is too large makes the pump work at a lower pressure. A tip that is too small deadheads the pump. The pressure washing calculator's dollars do not know that. The orifice line does.
04
Equipment
The washer is the machine.
Dengaro arranges financing for a pressure washer. The job price is not a loan amount.
Important questions
Know what to expect.
Is $75 an hour a market rate?+
No. It is an example. The pressure washing cost calculator multiplies the price you type.
What does the orifice number mean?+
It is the industry tip size for that flow and pressure. A result of 4.62 points at a 4.5 or a 5 tip. Check the tip chart that came with the tips.
Does the hour count include setup?+
Only if your production rate includes it. A pure spraying rate will understate the time on a job with a long hose pull. Lower the production number.
Is chemical included in the labor?+
No. It is the separate allowance. Set it to zero if the labor price already includes soap.
Financing built into the sale