Water Demand Calculator
Estimate daily demand, peak demand, diversity effect, and storage requirement.
Open ToolWater Tank Capacity Planner
A water tank sizing planner for daily demand, reserve days, usable tank volume, fire reserve, and refill planning.
Inputs
Forms are empty on load. Use sample data to preview the workflow or enter your own project values.
Learn more
Formula logic, use cases, assumptions, and limits for this tool.
How this tool helps
Use this to plan tank volume and refill rate. Keep fire reserve and domestic storage logic clearly separated where required.
Assumptions and limits
This tool provides a planning-level result. It does not replace detailed engineering design, approved software, manufacturer data, authority requirements, or project specifications.
Typical use cases
- Early estimation and tender support.
- BOQ sanity checking and technical review.
- Site discussion before final engineering verification.
- Comparison of alternatives using consistent assumptions.
Result interpretation
Read the recommendation, warning, and confidence sections together. A result without warnings is still not an approval; it only means the entered values did not trigger built-in planning alerts.
Related tools
Other tools in Plumbing & Drainage.
Pump Head Calculator
Calculate static head, pressure head, friction loss, velocity, and total dynamic head.
Open Tool
Drainage Pipe Sizing Assistant
Estimate drainage fixture units, pipe size guidance, and slope warning.
Open Tool
Hot Water Demand Calculator
Estimate hot water storage, heating energy, recovery rate, and heater capacity.
Open ToolCalculation methodology
Domestic reserve plus fire reserve is divided by usable storage percentage; refill rate is derived from gross volume and refill hours.
Inputs are treated as planning assumptions. The calculator shows warnings when entered values fall outside practical thresholds or selected standard-profile limits.
Version history
- v1.3.6-prelaunch: Added methodology, standard profile support, version notes, and direct PDF report download.
- v1.3.5: Calculator page added with sample data, warnings, and print-ready report layout.
Stage 2 roadmap: optional saved projects, dashboards, and shared calculation history without forcing login for free use.
Trust and verification
Every result includes assumptions, warning logic, and a downloadable report. Final engineering decisions still need qualified review, local authority approval, manufacturer data, and project specifications.
Worked example
Use the sample data button to load a realistic scenario, then download the PDF report to review inputs, results, methodology, warnings, and disclaimers in one place.