Water Demand Calculator
Estimate daily demand, peak demand, diversity effect, and storage requirement.
Open ToolPump Head Calculator
Pump head calculator for total dynamic head planning. Estimate static head, pressure head, pipe velocity, friction head, and equivalent pressure before pump curve selection.
What is a pump head calculator?
A pump head calculator estimates total dynamic head, often called TDH, before selecting a pump. It combines static lift, required outlet pressure, pipe friction, fittings allowance, and design margin into one head value. MEP engineers use it for chilled water pumps, domestic water booster pumps, transfer pumps, irrigation pumps, and preliminary plantroom checks. The calculator helps confirm whether a pump duty looks reasonable before checking a manufacturer pump curve. It is useful for tender review, early equipment schedules, pressure-zone checks, and comparing pipe-route options. The result is not a final pump selection because real design still needs pipe material, valve and fitting losses, NPSH, pump efficiency, operating point, diversity, standby philosophy, control sequence, and local code review. Use the result as a planning estimate, then verify against approved hydraulic calculations and manufacturer data.
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 for preliminary pump selection and pressure checks. Final selection must use pump curves, NPSH, pipe material, valve losses, and operating point verification.
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.
Input definitions and typical values
These notes explain what each input means and which values usually produce a more reliable planning result.
Static head m
Project input used directly in the calculation. Use measured, scheduled, manufacturer, or authority-approved values where available.
Required pressure at outlet bar
Pressure input used for pump, pipe, fire, or system checks. Use the required residual/static/differential pressure for the critical case.
Flow rate m3/h
Fluid flow rate. Use demand, fixture-unit conversion, process requirement, or load-derived flow as applicable.
Pipe internal diameter mm
Project input used directly in the calculation. Use measured, scheduled, manufacturer, or authority-approved values where available.
Pipe length m
Project input used directly in the calculation. Use measured, scheduled, manufacturer, or authority-approved values where available.
Equivalent fittings length m
Project input used directly in the calculation. Use measured, scheduled, manufacturer, or authority-approved values where available.
Safety margin %
Design safety margin. 5-15% is common for planning; excessive margin can oversize equipment, cables, pumps, or tanks.
Practical verification checklist
- Confirm the selected standard profile is suitable for the project location and authority.
- Replace sample values with project drawings, schedules, equipment data, or measured site values.
- Review warnings, methodology, and PDF report before using the result outside early planning.
- Verify final decisions against official standards, manufacturer data, consultant specifications, and local approvals.
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Open ToolCalculation methodology
Total dynamic head adds static head, pressure head, and approximate friction head from pipe velocity and equivalent length.
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.