Free online tools for gas detection calculations, unit conversions and calibration gas consumption.
Gas Detection Calculators
To assist in making informed decisions Gastech supplies you with a variety of calculators. These calculators can assist with converting:
- Your consumption of disposable calibration cylinders to cheaper high-volume cylinders
- Chemical concentrations from PPM to %Volume and Combustibles
- Amp outputs from certain calibration gases
- Conversion of parameters such as distances or Watts to mA and current
- Cable sizes based on distances and resistance
Simply select the required calculation below and away you go!
Feel free to use this page as often as required.
Which gas are you using in the Calibration?
Monthly consumption (in Litres)
PPM to %Vol
Enter ppm :
%Vol :
%Vol to ppm
Enter %Vol :
ppm :
LEL Calculation to %LEL
Chemical :
Enter Gas LEL :
Enter gas :
%LEL :
LEL Calculation to %Vol
Chemical :
Enter Gas LEL :
Enter %LEL :
GAS% :
4-20mA Calculations
Range of unit :
Cal gas :
mA reading :
40-200mV Calculations
Range of unit :
Cal gas :
mV reading :
Inches to CM
Inches :
CM :
CM to Inches
CM :
Inches :
Foot and Inches to CM
Foot :
Inches :
CM :
Feet to Meters
Feet :
Meters :
Watts to mA
Watts :
Volts :
mA :
mA to Watts
mA :
Volts :
Watts :
Watts to mA
Watts :
Volts :
mA :
mA to Watts
mA :
Volts :
Watts :
Current Calculation
mA :
Total :
3 Wire — Distance of Cable
Supply Volts :
Min Operating Volts :
Max Current Draw (mA) :
Cable Size/Ω/100m :
Distance of Cable :
3 Wire — Size of Cable
Supply Volts :
Min Operating Volts :
Max Current Draw (mA) :
Distance (m) :
Ohms per 100 m :
Size of cable :
2 Wire — Distance of Cable
Supply Volts :
Min Operating Volts :
End Input Resistance :
(e.g. 4100R Card – 100 Ω)
(e.g. 4100R Card – 100 Ω)
Max Current Draw (mA) :
Cable Size/Ω/100m :
Distance of Cable :
The right numbers make all the difference in gas detection.
Getting gas detection right isn’t just about having the right equipment, it’s about configuring and maintaining it correctly. Our free online gas detection calculators help you work through the technical detail quickly, so you can get on with the job.
The Gas Saver Consumption Calculator shows you how much you could save by switching from disposable calibration cylinders to high-volume alternatives. For teams running regular calibration programs across WA, NSW and QLD, the savings add up fast.
The chemical conversion calculators let you move between PPM and %Vol, calculate LEL percentages and work through combustible gas concentrations – useful whether you’re setting alarm thresholds or reviewing detector specifications.
For fixed gas detector installations, the cable calculators take the guesswork out of 2-wire and 3-wire runs. Enter your supply voltage, minimum operating voltage and current draw, and the tool will calculate maximum cable distance or the correct cable size for your installation.
The AMP and current calculators handle 4-20mA and 40-200mV signal outputs, while the measurement tools cover common unit conversions including inches to centimetres and watts to milliamps.
Gastech has supported gas detection projects across Australia and internationally since 1978. If you need help interpreting results or selecting the right equipment for your application, our technical team is ready to assist. For further guidance on workplace chemical hazards, refer to the Safe Work Australia standards on hazardous chemicals.
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