Formula Used
Flow activity = Frequency × Duration × Flow rate Cycle activity = Cycles × Water per cycle Area irrigation = Area × Net depth ÷ Efficiency Leak loss = Leak rate × Leak duration Daily total = Indoor + Outdoor + Commercial + Leaks Monthly total = Daily total × Occupied days Tank capacity = Daily total × Storage days × Safety factor Estimated bill = Water charge + Wastewater + Fixed charge + Tax
How to Use
Select a calculation mode and measurement system first. Enter realistic fixture, activity, outdoor, and leak values. Submit the form to view detailed totals and savings.
Choose either area-depth or flow-duration irrigation calculations. Add custom activities when standard fields are insufficient. Review billing rates before relying on estimated monthly costs.
Compare current usage against efficient fixture assumptions. Save scenarios for later comparisons on this device. Export the report for records, planning, or sharing.
Example Data
| Input | Example | Purpose |
|---|---|---|
| Household members | Three | Scales personal activities. |
| Shower flow | 9 L/min | Estimates shower consumption. |
| Toilet volume | 6 L/flush | Estimates flushing consumption. |
| Lawn and garden | 105 m² | Supports irrigation estimates. |
| Watering depth | 12 mm | Calculates applied irrigation volume. |
| Water rate | £2.10 per m³ | Estimates variable charges. |
Frequently Asked Questions
What does this calculator measure?
It estimates indoor, outdoor, commercial, leak, billing, and storage needs.
Can I use gallons?
Yes. Choose US customary or UK imperial measurements.
How are showers calculated?
Shower frequency multiplies duration, flow rate, and household size.
How does rainfall affect irrigation?
Usable rainfall reduces the weekly irrigation depth requirement.
What is irrigation efficiency?
It represents water reaching plants after distribution losses.
How are leaks estimated?
Leak rate multiplies the duration that water escapes.
Are bill estimates exact?
No. Tariffs, taxes, minimum charges, and billing rules vary.
What does the efficient comparison use?
It applies lower fixture rates and improved outdoor efficiency.
Can I add unusual activities?
Yes. Add custom activities with frequency and volume.
How is tank capacity calculated?
Daily demand multiplies storage days and a safety allowance.
Where are saved scenarios stored?
They remain in this browser using local device storage.
Important Notes
Results depend entirely on the entered assumptions. Actual fixture rates and billing structures can differ. Confirm important decisions with meter readings and provider statements.