Soil Wetting Volume Calculator
Estimate the delivered water volume for a chosen ground area and target depth, adjusted for a user-supplied application efficiency.
How to use this calculator
- Enter area to wet (m²), target water depth (mm), application efficiency (%); check the units and use values from the same period or scenario.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
Net water needed (litres) = area in m² × depth in mm. Gross applied volume = net volume ÷ (efficiency ÷ 100).
- Net water is 975 litres; estimated gross application is 1,300 litres.
- Actual soil uptake, runoff, slope, evaporation, plant needs and local restrictions can change how much water should be applied.
Worked examples
Worked example
65 m² needs a target depth of 15 mm with an estimated 75% application efficiency.
Net water is 975 litres; estimated gross application is 1,300 litres.
Net water is 975 litres; estimated gross application is 1,300 litres.
Understanding the result
Net water is 975 litres; estimated gross application is 1,300 litres.
Actual soil uptake, runoff, slope, evaporation, plant needs and local restrictions can change how much water should be applied.
Important notes
Actual soil uptake, runoff, slope, evaporation, plant needs and local restrictions can change how much water should be applied.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
Why is one millimetre equal to one litre per square metre?
A 1 mm water layer over 1 m² has a volume of 0.001 m³, which is one litre.
Is this a watering recommendation?
No. It converts the depth and efficiency assumptions you enter into a volume estimate.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.