VPD Tool
VPD Heatmap with Growth Stage Zones
-- kPa
Air Temperature
78°F
Relative Humidity
55%
Leaf Temperature Offset
0°F
Leaf VPD (with offset)
1.24
kPa
Air VPD
1.24
kPa
FLOWER ZONE

Flower

76-82°F | 45-58% RH | 1.0-1.5 kPa

Higher VPD supports generative development. Keep RH under 60% for mold prevention.

▼ Show Formula Reference
SVP (Saturation Vapor Pressure): SVP = 0.6108 × e^((17.27 × T) / (T + 237.3)) (Tetens equation, T in °C)
VPD: VPD = SVP × (1 - RH/100)
For leaf VPD, substitute leaf surface temperature for air temperature. CropVision measures this directly with IR sensors.
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