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Calcimator

Spray Equipment Calculator

Calculate flow rates, material usage, overspray factors, and thinning requirements for airless and HVLP spray equipment.

Inputs

thou
PSI
sq ft/gal
KU
sq ft

Results

Flow Rate

0.03 GPM

Material Needed

11.34 gal

≈ 11 milk jugs

Overspray Factor1.7x
Spray Time5.91 hrs
Thinner Needed0 gal
How to Use This Calculator
  1. Enter your spray tip size (thousandths of an inch) and operating pressure (PSI).
  2. Input coverage rate (sq ft/gal) from the coating manufacturer's data sheet.
  3. Enter material viscosity (KU) and total job area (sq ft).
  4. Review Flow Rate (GPM), Material Needed (gal), Overspray Factor, and Spray Time (hrs).
  5. Thin material if viscosity is high and re-check the Thinner Needed output.

How the result changes with Tip Size

Tip SizeFlow RateMaterial Needed
9.50.01 GPM11.34 gal
210.06 GPM11.34 gal
340.16 GPM11.34 gal
460.3 GPM11.34 gal

What each input means

Tip Size
Spray tip orifice size in thousandths of an inch (e.g. 15 = 0.015").
Spray Pressure
Operating pressure of the sprayer in PSI.
Coverage Rate
Manufacturer-rated coverage per gallon of material.
Material Viscosity
Viscosity in Krebs Units. Higher values may require thinning.
Job Area
Total surface area to be sprayed.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Tip Size = 15, Spray Pressure = 2000, Coverage Rate = 300, Material Viscosity = 100 = 5 input(s) provided
  2. Calculate Flow Rate
    Flow Rate
    0.032 = 0.032
  3. Calculate Material Needed
    11.34 = 11.34
  4. Calculate Overspray Factor
    Overspray Factor
    1.7 = 1.7
  5. Calculate Spray Time
    Spray Time
    5.91 = 5.91

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