VPD Calculator

Find vapor pressure deficit from temperature and humidity.

VPD (kPa) 1.267

Saturation vapor pressure (kPa) 3.168

Formula: SVP = 0.6108·e^(17.27T/(T+237.3)); VPD = SVP(1−RH/100)

Step-by-step with your numbers:

1. Values used:

2. Air temperature = 25 °C

3. Relative humidity = 60 %

5. VPD = 1.267kPa

6. Saturation vapor pressure = 3.168kPa

Did we solve your problem today?

VPD describes how 'thirsty' the air is — a key driver of plant transpiration.

The math behind it

Saturation vapor pressure SVP = 0.6108 × e^(17.27T ÷ (T+237.3)); VPD = SVP × (1 − RH/100).

25 °C, 60% RH → ~1.27 kPa.

Ideal range?

Many crops thrive around 0.8–1.2 kPa.