FREE SHIPPING

Orders over $499

RARE & EXOTIC PLANTS

Hard-to-find varieties

PREMIUM QUALITY

Only the best for your grow

chevron_left chevron_right

VPD Calculator

Calculate vapour pressure deficit and dial in temperature & humidity for every growth stage

Air & Units

Unit System

Air Temperature (°C)

Relative Humidity (%)

Leaf Temperature

Enter leaf temperature directly

Leaf Temp Offset (°C below air)

Leaves transpire and sit cooler than the air, typically 1 to 3 °C below.

Target Range

Crop

Some crops shift their VPD target by stage; others sit in one band their whole life.

Growth Stage

Targets use leaf (canopy) VPD, the metric that matters to the plant.

Leaf VPD is the key number. Aim for the green band for your stage.

Hydro Oasis • VPD Calculator