Water Tank Irrigation Coverage Calculator
Work out how much field area a stored volume of water can irrigate to a target depth.
One litre spread over one square metre is one millimetre of depth, so area (m²) = volume (litres) ÷ depth (mm). Use this to plan how far a farm pond, tank or tanker load will stretch.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Farmers and irrigation engineers use the free Water Tank Irrigation Coverage Calculator to get an accurate answer in seconds — no formulas to remember, works offline in the field.
About Water Tank Irrigation Coverage Calculator
When water comes from a fixed store — a farm pond, an overhead tank or a tanker — the practical question is how much land it will cover. Because one litre spread over one square metre equals one millimetre of depth, the area a tank can irrigate is simply its volume in litres divided by the depth you need in millimetres. This tool does that conversion and reports the area in m², hectares and acres, so you can ration a limited store across your fields.
How to use Water Tank Irrigation Coverage Calculator
- 1Enter your system or field values into the inputs.
- 2Read the headline result and the supporting breakdown.
- 3Apply the guidance in the note to your irrigation plan.
Why use Water Tank Irrigation Coverage Calculator?
- ✓Uses the standard, citable irrigation engineering formula
- ✓Clear inputs with sensible defaults
- ✓Instant result with the working shown
- ✓Free, fully in-browser and private
Frequently asked questions
How much area can my water tank irrigate?+
Divide the tank volume in litres by the irrigation depth in millimetres to get area in square metres. For example, 10,000 litres at a 25 mm depth covers 400 m² (0.04 ha). Deeper irrigations cover less area from the same tank.
Does the irrigation method change the coverage?+
This tool gives the net area for the depth you enter. Inefficient methods (flood) need a larger gross depth to deliver the same net depth, so they cover less effective area per tank than drip — apply your method's efficiency to compare.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline and your data never leaves the device.
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