Air compressor pressure gauge
Free calculators

Air Compressor Calculators

Free online calculators for compressed air pressure drop, compressor output, dew point and compressor room ventilation. Results update as you type.

Technical resources

Pick a Calculator

On this page, Airpower would like to assist you by providing some handy calculators. Our online compressor tools can help you deal with all the math needed when it comes to calculating compressor outputs and pressure drops. All you need to know about pressure and compressor calculation can be found here!

Air line planning

How to Determine the Pressure Drop in Any Compressor Air Line

Enter your air flow, the length and internal diameter of the pipe, and your working pressure. Results update as you type.

Pressure drop
…bar
Pressure at end of line
…
Loss of working pressure
…

Formula: Δp = 450 × q1.85 × l ÷ (d5 × p), with q in l/s, l in m, d in mm and p in bar absolute.

System performance

How Compressor Output is Calculated

Use a pump-up test on your receiver to check whether your compressor is still delivering its expected output.

Free air delivery
…l/min
In cfm
…
In l/s
…
Rule-of-thumb output
…

Formula: FAD = V × (p2 − p1) × 60 ÷ (1.013 × t). Empty the receiver, close the outlet, and time how long the compressor takes to pump up.

Moisture measurement

Dewpoint Calculator for Moisture Measurement

This tool is essential for precise moisture measurements in gases, ensuring seamless unit conversions. Enter a dew point, say where it was measured, then choose the line pressure and gas type.

Pressure dew point
…°C
Pressure dew point (°F)
…
Atmospheric dew point
…
Atmospheric dew point (°F)
…
Moisture ppm(v)
…
Moisture ppm(w)
…
Absolute humidity
…

Uses Buck saturation vapour pressure (over water above 0 °C, over ice below). Absolute humidity is per normal m³ (0 °C, 1.013 bar).

Compressor rooms

Compressor Room Ventilation Calculator

  • You can connect the ventilation fan, electrically, with the compressor(s) cooling fan(s). The fan switches on when the compressor fan switches on.
  • Please remember, the Airpower screw compressors do not have a thermostat. It controls the compressor’s temperature by stopping and starting the compressor’s fan.
  • If you run an additional fan, it must not suck or blow air through the compressor’s cooler when the compressor’s cooler fan is not running.
  • You can install ducting from the compressor’s cooler to the outside of the building, with an additional fan in the ducting, provided the additional fan is interlocked with the compressor’s cooling fan.
  • Never reduce the sectional area of the ducting at any point.
Ventilation air flow
…m³/s
Per hour
…
Minimum opening at 4 m/s
…

Formula: qv = Pv ÷ (1.21 × ΔT). Example: a 37.5 kW screw compressor with ΔT = 7 °C needs 4.43 m³/s.

Please note that you are making use of these calculators out of free will and that Airpower cannot be held responsible for any action resulting from the use of these calculators.

Quick answers

Frequently Asked Questions

How do I calculate pressure drop in an air compressor line?

To calculate pressure drop, you'll need to know the compressor's pressure and flow rate. Airpower’s Pressure Drop Calculator makes this process simple - just input your values and get real-time results for better system planning.

Why is compressor output important, and how is it calculated?

Compressor output determines whether your system is performing efficiently. It's based on pressure and flow rate. Use our Compressor Output Calculator to instantly verify if your unit is delivering the expected output.

What is dewpoint in compressed air systems, and why does it matter?

Dewpoint measures moisture content in compressed air. If not properly controlled, it can damage equipment and affect air quality. Airpower’s Dewpoint Calculator helps monitor and convert between multiple dewpoint units.

Can I use these calculators for any type of compressor system?

Yes - these tools are designed for broad compatibility. Whether you're managing industrial compressors or smaller systems, the calculators support various units, gas types, and pressure ratings.

Are the Airpower compressor calculators free to use?

Yes! All calculators are freely available for customer use. Just keep in mind that results are for guidance only, and Airpower cannot be held liable for actions taken based on the calculations.

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