Soil Moisture Sensor Calculator

Calculate sensor placement depths, irrigation trigger points, and scheduling intervals from soil water-holding capacity.

Field capacity (vol %)

Wilting point (vol %)

Root zone depth (in)

Allowed depletion (%)

Daily crop ET (in/day)

Field area (acres)

Tab to move between fields

Readily available water (in)

1.8

Irrigation trigger (vol %)

22.5

AWC (in/in)0.15

Total available water (in)3.6

Primary sensor depth (in)8

Secondary sensor depth (in)16

Irrigation interval (days)7.2

Sensors recommended2

Refill VWC30

Deep Check Depth (in)24

Gross Irrigation Depth (in)2.25

How to Use This Calculator

Enter field capacity and wilting point as volumetric percentages for your soil type.
Set root zone depth in inches appropriate to your crop.
Enter Management Allowed Depletion (%) — typically 50% for most crops.
Input daily crop ET (in/day) and field area in acres.
Read Irrigation trigger (vol%) to program sensor alerts and Irrigation interval (days) for scheduling.

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