VPD Calculator & Chart

Growth stage

Clone Veg Flower Late flower

Air temperature

°F

Relative humidity

Your VPD

1.10 kPa

Within the selected VPD range

Veg reference0.8–1.1 kPa

RH for this range at your temperatures60–69%

Assuming leaves are 2°F cooler than air (76°F).

Leaf temperature Assumed offset

Temperature basis

Use an offset I measured the leaf

Leaf minus air temperature

°F

Negative means cooler than air; positive means warmer. This offset is an assumption unless measured.

Explore the chart

Below rangeIn rangeAbove range

Scroll freely over the chart. Enable adjustment to tap or drag new temperature and RH readings.

1.10 kPaWithin rangeRH 60–69%