Free Online Interactive Psychrometric Chart

A convenient, precise and customizable psychrometric chart & calculator tool for HVAC engineers. Support IP and SI units.

Click on chart for air properties
Quantity Value Units
P.Ambient Pa
T.Dry.Bulb °C
Humid.Ratio g/kg(d.a)
Rel.Humid %
T.Wet.Bulb °C
T.Dew °C
T.Saturation °C
Enthalpy kJ/kg(d.a)
P.Vapour Pa
P.Sat.Vapour Pa
Spec.Heat kJ/(kg.K)
Spec.Volume m^3/kg(d.a)
Density kg/m^3
Air processing calculation
# Tdry, °C
Set point to -1,-1 to start new line.
Select 2 point #
Point A: Point B:
State changes from point A to B
Dry air flow: kg/h
Delt.H/Delt.d kJ/g
Heating load kW
Cooling load kW
Humidifying g/s
Sensible heat kW
Latent heat kW
Mixed air from state A and B
Point A percent: %
T.Dry.Bulb °C
T.Wet.Bulb °C
T.Dew.Point °C
Rel.Humidity %
Spec.Humidity g/kg(d.a)
Enthalpy kJ/kg(d.a)
Primary return air cycle
Quantity Value Unit
Tdry.Indoor °C
Rel.Humid.Indoor %
Tdry.Outdoor °C
Rel.Humid.Outdoor %
T.Vent.Diff °C
Fresh.Air.Ratio %
Heat.Load kW
Wet Load kg/h
kg/h
°C
Vent.Rel.Humid %
T.Dew.Apparatus °C
Cooling Load kW
Heating Load kW
Fresh Flow kg/h
Return Flow kg/h
Secondary return air cycle
Quantity Value Unit
Tdry.Indoor °C
Rel.Humid.Indoor %
Tdry.Outdoor °C
Rel.Humid.Outdoor %
T.Vent.Diff °C
Fresh.Air.Ratio %
Heat.Load kW
Wet Load kg/h
kg/h
°C
Primary Flow kg/h
Secondary Flow kg/h
Fresh Flow kg/h
Vent.Rel.Humid %
T.Dew.Apparatus °C
Cooling Load kW
Heating Load kW
Parameter settings
For I/P units:
Huimidity Ratio
Pressure
Chart limits:
Min.Humid.Ratio g/kg(d.a)
Max.Humid.Ratio g/kg(d.a)
Min.T.Dry.Bulb °C
Max.T.Dry.Bulb °C
P.Sea.Level Pa
Altitude m
Apparatus dew point humidity: %
Display settings
Item Color Line.Style Width
BackGround
Frame
T.Dry.Bulb
Spec.Humidity
Rel.Humidity
Enthalpy
Spec.Volume
Process line
Protractor
Display preset:
-10-505101520253035404550 0123456789101112131415161718192021222324252627282930 0.80 m^3/kg(d.a)0.90 10%20%30%40%50%60%70%80%90% -10-505101520253035404550556065707580859095100105110115120kJ/kg(d.a) Dry Bulb Temperature, °C. Pressure = 101325 Pa Humidity Ratio, g/kg(d.a) SENSIBLE HEATQsTOTAL HEATQt=HUMIDITY RATIOdWENTHALPYdH=-880.00.10.20.30.40.50.60.70.80.91.01.01.52.04.08.0-0.2-0.5-1.0-2.0-4.00.01.02.02.53.04.05.06.07.08.010.0-1.0-2.0-5.0-10.08 Sorry, your browser does not support inline SVG.
Desktop Version
For windows, without network and browser limits. Click following button to download the software with 30 days full functional free trial, or pay $65 to get up to 3 license keys.


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