What is absolute humidity of air?

Absolute humidity of air expresses the actual amount of water vapour in grams contained in one cubic metre of air (g/m³). It depends on the temperature and relative humidity of the environment.

Why is absolute humidity important in wood drying?

The humidity of the surrounding air directly affects the equilibrium moisture content of wood. The higher the absolute humidity of the air in the kiln, the more slowly the wood dries and the higher its final moisture content remains.

What is the difference between absolute and relative humidity of air?

Relative humidity (%) indicates what percentage of the air's maximum capacity is filled with water vapour. Absolute humidity (g/m³) indicates the actual amount of water in the air regardless of its capacity.

What is the optimum relative humidity of air for drying sawn timber?

For natural drying of sawn timber, a relative humidity of 60–75% is recommended. In kiln drying, humidity is controlled according to the drying schedule for the relevant wood species and material thickness.

Absolute humidity of air
Amount of water in m³ of air

Enter the air temperature and relative humidity. The calculator determines the absolute humidity – the actual amount of water contained in 1 m³ of air.

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Amount of water per m³ of air

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Temperature (°C)

Relative humidity (%)

The final value is approximate and due to various factors may differ from the actual value.Did you find an inaccuracy?

Did you find an inaccuracy?

Our aim was to create calculators for wood professionals that provide the most accurate results possible. However, there are many coefficients, standards, deviations and calculation methods that vary by country and local conditions, so it is not possible to cover all locations with 100% accuracy immediately. For some calculators, however, it is possible to enter custom parameters, such as wood densities or growth factors.
However, the system is designed so that we can refine it gradually, and we would appreciate your feedback, which will help us improve the calculators further and adapt them to practical use.

Tree species parameters

Wood species parameters, such as density, can vary significantly depending on location and growing conditions. To account for these natural variations, we offer fine-tuning options that help ensure accurate and reliable data adapted to specific environments.

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Absolute humidity of airAmount of water in m³ of air

Amount of water per m³ of air

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Tree species parameters

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Absolute humidity of air
Amount of water in m³ of air