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FREE Dewpoint Calculator - For Trace Moisture Measurements in Gases & Air

The Dew Point Calculator will inter convert between various units of measurement. To use, just enter a number in either one of the two dewpoint values, selecting appropriate units, or one of the four absolute values before pressing the calculate button. 'Line Pressure' and 'Gas Type' are only required as inputs if the 'dewpoint at line pressure' or 'ppm(w)' are to be used/calculated.

The NEW SADPmini2 & SADPmini2-Ex are out NOW.
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USB Comms and Charging, Log Up To 300,000 Captures, Removeable SD
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Powerful PC User-Tool Software for Ultimate Configurations.
Get Full Details Here and PDF Datasheet.INVEST IN THE BEST

 Dewpoint Values
Dewpoint at Atmospheric Pressure:  
Dewpoint at Line Pressure:  



 Absolute Values

Parts per million by volume:    ppm(v)
Parts per million by weight:    ppm(w)
Absolute humidity:    g/m³


 Optional Inputs
Gas Type:   of molecular weight
Line pressure:  



PLEASE NOTE: Whilst every effort has been made by Alpha Moisture Systems, to ensure that the calculations derived by the moisture calculator are correct, it assumes no responsibility for any errors. In no event shall Alpha Moisture Systems be liable for any damages whatsoever, arising from or relating to information contained in this site.


Replacing your old dewpoint instruments?
See datasheet PDF bank below for more information.

Hand-Held Portable Dewpoint Meters On-Line Hygrometers
NEW SADPmini2 Model 6020-Sensor
NEW SADPmini2-Ex DS1200-AMT
SADPmini DS1200-AMTEx
SADPmini-Ex DS2000-Sensor.
Portable Dewpoint Meters DS1200-PDT(-40C to +30C)
DSP-Ex Sampling Systems
DSP-FCI NEW PSS - Portable Sample System
P35 SS1 and SS2 (Low Pressure)
  SS3 and SS4 (High Pressure)
Transmitters and Sensors SS-TEG
PDT (-40C to +30C) Chilled Mirror Dewpoint Hygrometer
PDT (-60C to +20C) CMH-RPC

See our sister website for more information.

alpha moisture systems
Alpha House, 96 City Road
t:+44 (0)1274 733 100  f:+44(0)1274 733 200