VALICALC · TECHNICAL REFERENCE

Humidity Ratio & Dew Point Reference

Look up humidity ratio, dew point and moist-air enthalpy for selected dry-bulb/RH pairs at 1 atm. Keep psychrometric conditions visible in HVAC planning.

SCENARIO MATRIX

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Dry-bulb °CRH %

SELECTED REFERENCE

10 °C / 30% RH

Humidity ratio: 2.279139 g/kg dry air
Dew-point temperature: -6.01 °C
Moist-air enthalpy: 15.798 kJ/kg dry air

All fields & cell provenance

Dry-bulb temperature: 10 °C
Relative humidity: 30 %

Air condition: Generated dry/humid air thermophysical points — CoolProp 7.1.0 HAPropsSI at 101325 Pa; dry-air mass basis · verified 2026-10-07 · source value 10 °C / 30% RH.
Humidity ratio: Generated dry/humid air thermophysical points — CoolProp 7.1.0 HAPropsSI at 101325 Pa; dry-air mass basis · verified 2026-10-07.
Dew-point temperature: Generated dry/humid air thermophysical points — CoolProp 7.1.0 HAPropsSI at 101325 Pa; dry-air mass basis · verified 2026-10-07.
Moist-air enthalpy: Generated dry/humid air thermophysical points — CoolProp 7.1.0 HAPropsSI at 101325 Pa; dry-air mass basis · verified 2026-10-07.
Dry-bulb temperature: Generated dry/humid air thermophysical points — CoolProp 7.1.0 HAPropsSI at 101325 Pa; dry-air mass basis · verified 2026-10-07.
Relative humidity: Generated dry/humid air thermophysical points — CoolProp 7.1.0 HAPropsSI at 101325 Pa; dry-air mass basis · verified 2026-10-07.

v1.3.0 · verified 2026-10-07

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10 °C / 30% RH2.279139 g/kg dry airBack to answer ↑

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24 matching rows · 24 in this subset

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Humidity Ratio & Dew Point Reference, metric display
Air condition	Humidity ratio	Dew-point temperature	Moist-air enthalpy
10 °C / 30% RH	2.279139 g/kg dry air	-6.01 °C	15.798 kJ/kg dry air
10 °C / 50% RH	3.807867 g/kg dry air	0.064 °C	19.648 kJ/kg dry air
10 °C / 70% RH	5.344102 g/kg dry air	4.788 °C	23.517 kJ/kg dry air
10 °C / 90% RH	6.887898 g/kg dry air	8.437 °C	27.404 kJ/kg dry air
15 °C / 30% RH	3.169977 g/kg dry air	-2.14 °C	23.101 kJ/kg dry air
15 °C / 50% RH	5.301308 g/kg dry air	4.674 °C	28.489 kJ/kg dry air
15 °C / 70% RH	7.447222 g/kg dry air	9.58 °C	33.912 kJ/kg dry air
15 °C / 90% RH	9.60787 g/kg dry air	13.375 °C	39.372 kJ/kg dry air
20 °C / 30% RH	4.355786 g/kg dry air	1.917 °C	31.17 kJ/kg dry air
20 °C / 50% RH	7.293698 g/kg dry air	9.274 °C	38.623 kJ/kg dry air
20 °C / 70% RH	10.259302 g/kg dry air	14.368 °C	46.145 kJ/kg dry air
20 °C / 90% RH	13.252993 g/kg dry air	18.311 °C	53.737 kJ/kg dry air
25 °C / 30% RH	5.917667 g/kg dry air	6.242 °C	40.219 kJ/kg dry air
25 °C / 50% RH	9.925739 g/kg dry air	13.867 °C	50.423 kJ/kg dry air
25 °C / 70% RH	13.985313 g/kg dry air	19.152 °C	60.757 kJ/kg dry air
25 °C / 90% RH	18.097386 g/kg dry air	23.245 °C	71.222 kJ/kg dry air
30 °C / 30% RH	7.955134 g/kg dry air	10.553 °C	50.513 kJ/kg dry air
30 °C / 50% RH	13.372587 g/kg dry air	18.451 °C	64.356 kJ/kg dry air
30 °C / 70% RH	18.884033 g/kg dry air	23.931 °C	78.435 kJ/kg dry air
30 °C / 90% RH	24.491941 g/kg dry air	28.178 °C	92.757 kJ/kg dry air

10 °C / 30% RH

Humidity ratio: 2.279139 g/kg dry air
Dew-point temperature: -6.01 °C
Moist-air enthalpy: 15.798 kJ/kg dry air

More dimensions

Dry-bulb temperature: 10 °C
Relative humidity: 30 %

10 °C / 50% RH

Humidity ratio: 3.807867 g/kg dry air
Dew-point temperature: 0.064 °C
Moist-air enthalpy: 19.648 kJ/kg dry air

More dimensions

Dry-bulb temperature: 10 °C
Relative humidity: 50 %

10 °C / 70% RH

Humidity ratio: 5.344102 g/kg dry air
Dew-point temperature: 4.788 °C
Moist-air enthalpy: 23.517 kJ/kg dry air

More dimensions

Dry-bulb temperature: 10 °C
Relative humidity: 70 %

10 °C / 90% RH

Humidity ratio: 6.887898 g/kg dry air
Dew-point temperature: 8.437 °C
Moist-air enthalpy: 27.404 kJ/kg dry air

More dimensions

Dry-bulb temperature: 10 °C
Relative humidity: 90 %

15 °C / 30% RH

Humidity ratio: 3.169977 g/kg dry air
Dew-point temperature: -2.14 °C
Moist-air enthalpy: 23.101 kJ/kg dry air

More dimensions

Dry-bulb temperature: 15 °C
Relative humidity: 30 %

15 °C / 50% RH

Humidity ratio: 5.301308 g/kg dry air
Dew-point temperature: 4.674 °C
Moist-air enthalpy: 28.489 kJ/kg dry air

More dimensions

Dry-bulb temperature: 15 °C
Relative humidity: 50 %

15 °C / 70% RH

Humidity ratio: 7.447222 g/kg dry air
Dew-point temperature: 9.58 °C
Moist-air enthalpy: 33.912 kJ/kg dry air

More dimensions

Dry-bulb temperature: 15 °C
Relative humidity: 70 %

15 °C / 90% RH

Humidity ratio: 9.60787 g/kg dry air
Dew-point temperature: 13.375 °C
Moist-air enthalpy: 39.372 kJ/kg dry air

More dimensions

Dry-bulb temperature: 15 °C
Relative humidity: 90 %

20 °C / 30% RH

Humidity ratio: 4.355786 g/kg dry air
Dew-point temperature: 1.917 °C
Moist-air enthalpy: 31.17 kJ/kg dry air

More dimensions

Dry-bulb temperature: 20 °C
Relative humidity: 30 %

20 °C / 50% RH

Humidity ratio: 7.293698 g/kg dry air
Dew-point temperature: 9.274 °C
Moist-air enthalpy: 38.623 kJ/kg dry air

More dimensions

Dry-bulb temperature: 20 °C
Relative humidity: 50 %

20 °C / 70% RH

Humidity ratio: 10.259302 g/kg dry air
Dew-point temperature: 14.368 °C
Moist-air enthalpy: 46.145 kJ/kg dry air

More dimensions

Dry-bulb temperature: 20 °C
Relative humidity: 70 %

20 °C / 90% RH

Humidity ratio: 13.252993 g/kg dry air
Dew-point temperature: 18.311 °C
Moist-air enthalpy: 53.737 kJ/kg dry air

More dimensions

Dry-bulb temperature: 20 °C
Relative humidity: 90 %

25 °C / 30% RH

Humidity ratio: 5.917667 g/kg dry air
Dew-point temperature: 6.242 °C
Moist-air enthalpy: 40.219 kJ/kg dry air

More dimensions

Dry-bulb temperature: 25 °C
Relative humidity: 30 %

25 °C / 50% RH

Humidity ratio: 9.925739 g/kg dry air
Dew-point temperature: 13.867 °C
Moist-air enthalpy: 50.423 kJ/kg dry air

More dimensions

Dry-bulb temperature: 25 °C
Relative humidity: 50 %

25 °C / 70% RH

Humidity ratio: 13.985313 g/kg dry air
Dew-point temperature: 19.152 °C
Moist-air enthalpy: 60.757 kJ/kg dry air

More dimensions

Dry-bulb temperature: 25 °C
Relative humidity: 70 %

25 °C / 90% RH

Humidity ratio: 18.097386 g/kg dry air
Dew-point temperature: 23.245 °C
Moist-air enthalpy: 71.222 kJ/kg dry air

More dimensions

Dry-bulb temperature: 25 °C
Relative humidity: 90 %

30 °C / 30% RH

Humidity ratio: 7.955134 g/kg dry air
Dew-point temperature: 10.553 °C
Moist-air enthalpy: 50.513 kJ/kg dry air

More dimensions

Dry-bulb temperature: 30 °C
Relative humidity: 30 %

30 °C / 50% RH

Humidity ratio: 13.372587 g/kg dry air
Dew-point temperature: 18.451 °C
Moist-air enthalpy: 64.356 kJ/kg dry air

More dimensions

Dry-bulb temperature: 30 °C
Relative humidity: 50 %

30 °C / 70% RH

Humidity ratio: 18.884033 g/kg dry air
Dew-point temperature: 23.931 °C
Moist-air enthalpy: 78.435 kJ/kg dry air

More dimensions

Dry-bulb temperature: 30 °C
Relative humidity: 70 %

30 °C / 90% RH

Humidity ratio: 24.491941 g/kg dry air
Dew-point temperature: 28.178 °C
Moist-air enthalpy: 92.757 kJ/kg dry air

More dimensions

Dry-bulb temperature: 30 °C
Relative humidity: 90 %

How to use this data

Generate HAPropsSI W (kg water/kg dry air), D (dew-point K), H (J/kg dry air). Display W×1000, D−273.15 and H/1000. Preserve temperature/RH/pressure conditions.

CHECK THE METHOD

Worked example

At 25 °C and 50% RH, dew point is about 13.9 °C. Humidity ratio is on dry-air mass; confirm actual pressure and measured humidity before using it.

Related calculators

CalculatorMini-Split Size Calculator CalculatorHeat Loss Calculator

Continue the reference workflow

ReferenceDry Air Properties Table ReferenceR-Value & U-Value Conversion Chart

Common lookup questions

What should I confirm before using this lookup?

Specific humidity and humidity ratio differ in mass basis. These points do not establish condensation safety, ventilation requirements or equipment latent capacity.

TRACEABLE DATA

Sources, scope & verification

Dataset v1.3.0
Last verified: 2026-10-07

24 pinned humid-air points: 10–35 °C and 30/50/70/90% RH, at 101325 Pa. No interpolation, outdoor design data or cooling-load estimate.

Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.

Generated dry/humid air thermophysical points ↗

Type C · CoolProp contributors · CoolProp 7.1.0; pinned JSON, not current online model version

Our selected generated model outputs. MIT attribution preserved in third-party-licenses/CoolProp-MIT.txt.

Full provenance & artifact record

Source checked: 2026-10-07
Use basis: open-license
License: MIT
Model revision: 2a1c5d7231011ed1c20067b8528150398d12c841
Artifact SHA-256: No retained source artifact hash; see the stated source and verification record.