Vapor Pressure Deficit Calculator
Free calculate vapor pressure deficit (vpd) for optimal plant growth and environmental control. Get instant, accurate results with our easy-to-use calculator.
VPD Calculation
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VPD Results
Enter environmental parameters to calculate VPD
Vapor Pressure Deficit Guide
What is VPD?
- • Difference between saturated and actual vapor pressure
- • Measures atmospheric demand for water
- • Critical for plant transpiration
- • Affects nutrient uptake and growth
- • Measured in kPa or hPa
Optimal VPD Ranges
- • Seedlings: 0.4-0.8 kPa
- • Vegetative: 0.8-1.2 kPa
- • Flowering: 1.0-1.5 kPa
- • High humidity crops: 0.5-1.0 kPa
- • Low humidity crops: 1.0-2.0 kPa
VPD Effects
- • Too low: Poor transpiration, disease risk
- • Too high: Water stress, stunted growth
- • Optimal: Healthy growth, good yields
- • Affects stomatal opening
- • Influences CO2 uptake
VPD Ranges by Crop Type
| Crop Type | Optimal VPD | Min VPD | Max VPD |
|---|---|---|---|
| Lettuce/Leafy Greens | 0.6-0.8 kPa | 0.4 kPa | 1.2 kPa |
| Tomatoes | 1.0-1.2 kPa | 0.6 kPa | 1.8 kPa |
| Cucumbers | 0.8-1.0 kPa | 0.5 kPa | 1.5 kPa |
| Peppers | 1.2-1.5 kPa | 0.8 kPa | 2.0 kPa |