VPD Calculator

Optimize your grow room climate with Vapor Pressure Deficit

Calculate Your VPD

Air Temperature24.0°C

15°C40°C

Leaf TemperatureAuto (Air - 2°C)

Leaf Temp (calculated)22.0°C

Diff to Air Temp-2.0°C

Relative Humidity55%

30%95%

Your VPD

1.00 kPa

Optimal

Dew Point: 14.4°C

Recommendations

Optimal conditions maintained
Continue current setup

VPD Heatmap

Optimal

Cold

Hot

Cold+Wet 0.0–0.4Seedlings 0.4–0.8Optimal 0.8–1.1Acceptable 1.1–1.4Too Hot +1.4

VPD

1.00

kPa

Air

24.0

°C

Leaf

22.0

°C

Humidity

Air (24.0°C) influences the VPD calculation.

The marker shows position based on Leaf, but the VPD colors change with Air Temp.

Optimal VPD Ranges

Seedlings

0.4-0.8

kPa

Optimal

0.8-1.1

kPa

Acceptable

1.1-1.4

kPa

What is VPD?

Vapor Pressure Deficit is the difference between moisture in the air vs moisture in the plant. It's critical for optimal growth.

VPD = SVP_leaf - (SVP_air × RH)

Optimal VPD helps plants absorb water, transport nutrients, and open stomata for CO2 uptake.

About Leaf Temperature

Leaf Temperature is typically 1-4°C lower than air temperature due to transpiration cooling.

Standard LEDAir - 1 to 2°C

Strong ventilationAir - 3 to 4°C

High-pressure lampsAir - 4 to 6°C

Use Manual if you know your exact leaf temperature.

Learn More

Explore our complete documentation for grow automation and climate control.

Read Documentation

Build Your Setup

Use our configurator to design a complete grow room with optimal VPD management.

Try Configurator