When to use this calculator
Measuring a leak into a container over a timed interval provides a more useful rate than counting drops alone.
Explore the water use & conservation calculators for other questions in this topic. For a related calculation, use the Rainwater Collection Calculator: Estimate collected water from rainfall, roof area and a runoff factor.
PUTTING IT INTO PRACTICE
Leak Water Loss: 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 |
|---|---|
| Measured leak rate (mL/min) | 100 |
| Days | 30 |
| Result | 4,320 litres |
- Check the input labels and enter the example values above.
- Apply the relationship: Lost litres = mL per minute × 60 × 24 × days/1000.
- The result is 4,320 litres, rounded for display.
How to interpret your result
Use a measured volume-per-time flow rate; drip size is too variable for a universal drops-to-volume factor.
Use measured flow rates when possible. A rainfall volume estimate is not a storage simulation and can exceed tank capacity. Fixed water charges and sewerage charges may follow separate tariff rules.
Frequently asked questions
Can rain collected exceed tank capacity?
The geometric collection estimate can. Storage, overflow, first-flush diversion and use during rainfall need a separate tank model.
When is the leak water loss calculator useful?
Measuring a leak into a container over a timed interval provides a more useful rate than counting drops alone.
How do I use the leak water loss calculator?
Enter measured leak rate (ml/min), days. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Lost litres = mL per minute × 60 × 24 × days/1000.
What should I check before using the result?
Use a measured volume-per-time flow rate; drip size is too variable for a universal drops-to-volume factor.
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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