When to use this calculator
Translate a selected irrigation depth into water volume. One millimetre over one square metre is one litre. This is not a crop-specific water recommendation.
Explore the irrigation & applied water calculators for other questions in this topic. For a related calculation, use the Rain Gauge Catch Depth Calculator: Convert collected water volume and opening area into rainfall depth.
PUTTING IT INTO PRACTICE
Irrigation Volume: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Irrigated area (m²) | 100 |
| Selected application depth (mm) | 10 |
| Result | 1,000 L |
- Check the input labels and enter the example values above.
- Apply the relationship: Litres = area × depth in millimetres.
- The result is 1,000 L, rounded for display.
How to interpret your result
One millimetre over one square metre is one litre. This is not a crop-specific water recommendation.
A water-budget conversion does not establish the crop’s requirement. Use measured flow and effective rainfall where possible. Distribution losses and runoff can make gross application differ from water retained in the root zone.
Frequently asked questions
Does one millimetre of rain equal one litre?
It equals one litre over each square metre of collection area. Total volume therefore depends on both depth and area.
When is the irrigation volume calculator useful?
Translate a selected irrigation depth into water volume. One millimetre over one square metre is one litre. This is not a crop-specific water recommendation.
How do I use the irrigation volume calculator?
Enter irrigated area (m²), selected application depth (mm). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Litres = area × depth in millimetres.
What should I check before using the result?
One millimetre over one square metre is one litre. This is not a crop-specific water recommendation.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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