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.
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.
depth mm = litres ÷ area m²U.S. formuladepth inches = U.S. gallons × 77 ÷ (area ft² × 48)Example: 100 litres over 10 m² represents 10 millimetres, approximately 0.394 inches, of equivalent depth. Distribution, runoff, leaks, interception, evaporation, and infiltration are not measured by this calculation.
Continue with the measurement you need.
Use one tool or follow the full pathway. These tools calculate from entered or measured values; they do not decide whether or how much to water.
- 1Measure source flow
Bucket-test a faucet, hose, or installed setup.
- 2Calculate drip output
Multiply entered emitter count, rate, and runtime.
- 3Connect flow to volume
Carry flow into runtime, volume, area-depth, rainfall, and a private record.
- 4Convert rain to volume
Calculate litres or U.S. gallons from entered rain depth and area.
- 5Convert volume to depth
Calculate equivalent geometric depth over an entered area.
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