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Convert between Pa, ppm and
Enter the molecular weight
and the working temperature, and one only of vapour pressure
(Pa) or airborne concentration in ppm or mg/m3
calculator will accept a series of numbers and display the total and
Enter a value, click on the button or hit [Enter] and
This calculator is optimised for face
velocity readings in m/s to 2 decimal places so there is no need to enter
a decimal point.
eg A value of 145 will be transposed to 1.45; 26
will become 0.26 etc
To change this, just select an option from
the drop-down menu.
This calculator will determine the volume flow through a duct.
Note: The duct wall is considered to be of
The volume flow for an air velocity of
m/s, through a circular duct with a
...through a rectangular duct
This calculator will determine the air change rate in a room. Enter the room dimensions and extract rate and click on the
The standard air density at 20°C and 1013mb barometric pressure is 1.2 kg/m3. Enter a different temperature or pressure value in the appropriate box.
Calculate air velocity, metres/second from pressure difference
The standard air density at 20°C and 1013mb barometric
pressure is 1.2 kg/m3.
Enter pressures and any
different density value in the appropriate boxes.
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