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Rainwater Collection Tank Size Calculator
Size a rainwater tank from roof area, rainfall and demand.
🛢️ Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Tank
Compare Your Options And Get Clear Answers
Size a rainwater tank from roof area, rainfall and demand.
Rainwater Collection Tank Size Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Match tank size to dry spells and supply.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Rainwater Quick Guide
Typical values for reference.
| Roof | Annual yield | Tank | Use |
|---|---|---|---|
| 50 sq m | 28000 L | 2000 L | Garden |
| 100 sq m | 56000 L | 5000 L | Home |
| 150 sq m | 84000 L | 8000 L | Toilets |
| 200 sq m | 112000 L | 10000 L | Full |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Rainwater Collection Tank Calculator FAQ
Answers to common questions about this calculator.
Enough to cover your demand through the longest dry spell.
It gives a quick estimate of rainwater collection tank size from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.