Cannabis VPD Calculator

Temperature: 75°F

Relative Humidity: 60%

Growth Stage:

Use Leaf Temperature (more accurate)

1.20

Optimal Range

Target: 1.0 kPa

Danger Low

Too Low

Optimal for Vegetative

Too High

Danger High

Your Reading

Set Custom Target VPD

Track Daily Light Integral (DLI)

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1.20

Optimal Range

Target: 1.0 kPa

Danger Low

Too Low

Optimal for Vegetative

Too High

Danger High

Your Reading

Set Custom Target VPD

Track Daily Light Integral (DLI)

Seedling Stage

Optimal VPD: 0.4 - 0.8 kPa

Temperature: 75-80°F (24-27°C)

Humidity: 65-75%

Young plants need higher humidity to support initial growth and root development.

Vegetative Stage

Optimal VPD: 0.8 - 1.2 kPa

Temperature: 75-82°F (24-28°C)

Humidity: 55-65%

Established plants can handle lower humidity as they develop stronger transpiration.

Flowering Stage

Optimal VPD: 1.0 - 1.5 kPa

Temperature: 70-78°F (21-26°C)

Humidity: 45-55%

Lower humidity prevents mold/mildew on dense buds while maintaining transpiration.

Seedling Stage

Vegetative Stage

Flowering Stage

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