TerraEvidence
Free applied-water geometry calculator

What equivalent depth does a water volume represent?

Enter the water volume and the area it covered to calculate the geometric equivalent depth in inches and millimetres.

Calculate equivalent depthSee the exact method
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Only compatible length, width, and units are read after you choose import. Crop and location fields are not copied.

Transparent method

Water volume divided by area

The result is an equivalent geometric layer if the entered volume were spread evenly over the entered area. It is not a catch-can uniformity test and does not establish what entered or remained in the root zone.

U.S. formuladepth inches = U.S. gallons × 77 ÷ (area ft² × 48)Metric formuladepth mm = litres ÷ area m²

Example: 69 U.S. gallons over 171.82 ft² represents approximately 0.644 inches of equivalent depth. Distribution, runoff, leaks, interception, evaporation, and infiltration are not measured by this calculation.