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Pump Head Calculator

Calculate Pump Head and Total Dynamic Head

Last Updated: 2026-08-13•by Ahmed

Calculate pump head and total dynamic head (TDH) from pressure, elevation, friction losses, and system requirements. Free pump head calculator for fluid systems.

Pump Head Inputs

kg/m3
m
m
m
m

Results

Enter valid inputs to see results

What is a Pump Head Calculator?

Pump head is the amount of energy a pump must add to a fluid to overcome pressure requirements, elevation changes, and resistance within the piping system. Total Dynamic Head (TDH) combines these components into the total head the pump needs to provide at the required operating condition.

This pump head calculator helps estimate the required TDH from pressure head, static head, system losses, and design margin. The result can be used as a preliminary duty point when evaluating pump performance.

Quick Summary

1Pump head is commonly expressed in meters or feet of fluid.
2TDH combines pressure head, static head, system losses, and any appropriate design margin.
3Pressure head depends on pressure difference and fluid density.
4Static head is determined by elevation difference.
5Friction and component losses depend on piping layout and operating conditions.
6Pump head should always be evaluated together with required flow rate.

Engineering Visuals

Total dynamic head components for pump head calculation
TDH combines pressure head, static head, system losses, and design margin.
Pressure head conversion from pressure difference and fluid density
Pressure difference can be converted into equivalent fluid head using density.

How to Use the Pump Head Calculator - Calculate Total Dynamic Head (TDH)

1. Choose the calculation mode

Use component-based TDH when you know pressure head, static head, losses, and margin. Use pressure-to-head mode when you need to convert pressure difference into equivalent head.

2. Enter pressure and density values

Pressure head depends on pressure difference and fluid density. Water is often estimated near 1000 kg/m3 for preliminary calculations.

3. Add elevation and system losses

Include static elevation head and known losses from pipe friction, valves, fittings, filters, check valves, and control valves.

4. Review total dynamic head

Use the calculated TDH as a preliminary pump duty value, then check the selected pump against manufacturer performance curves.

Key Formulas

Total dynamic head formula

TDH = Pressure Head + Static Head + System Losses + Margin

This component-based formula combines the major head requirements a pump must overcome.

Pressure head formula

H = Delta P / (rho x g)

Pressure difference is converted into equivalent fluid head using density and gravitational acceleration.

Static head formula

Static Head = Discharge Elevation - Suction Elevation

Static head is the elevation difference between the suction reference and discharge reference.

Key Factors

01

Pump head vs pressure

Head and pressure are related, but not identical. Pressure depends on fluid density, while head is commonly expressed as meters or feet of fluid.

02

Fluid density

For a fixed pressure difference, higher fluid density gives a lower equivalent pressure head.

03

System losses

Pipe friction, valves, fittings, filters, check valves, and control valves can add meaningful head requirements.

04

Flow and head together

Pump selection needs both required flow and required head. Head alone is not enough to select a reliable pump.

Typical TDH Components

Pressure head

From pressure difference

Converts required pressure rise into equivalent fluid head using density.

Static head

From elevation

Accounts for vertical elevation difference between suction and discharge points.

System losses

From pipe and components

Covers friction and component losses through the connected piping system.

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Frequently Asked Questions

What is a pump head calculator?
A pump head calculator estimates the total head a pump needs to provide based on pressure, elevation, system losses, and selected design inputs.
What is TDH in pumping systems?
TDH stands for Total Dynamic Head and represents the total head requirement the pump must overcome at the required operating condition.
How do you calculate pump head?
A preliminary calculation can combine pressure head, static head, system losses, and an appropriate design margin.
Is pump head the same as pressure?
No. Pump head and pressure are related, but they are different physical quantities and the relationship depends on fluid density.
How does fluid density affect pump head?
For a given pressure difference, higher fluid density corresponds to a lower equivalent head because H = Delta P / (rho x g).
Does pump head depend on flow rate?
The required system head can change with flow because friction and other losses generally change with flow.
What is the difference between static head and dynamic head?
Static head comes from elevation and pressure conditions, while dynamic losses are associated with fluid movement through piping and components.
How much pump head do I need?
The required head depends on pressure, elevation, piping losses, fittings, valves, and required operating flow.

Disclaimer

This pump head calculator provides preliminary engineering estimates. Final pump selection should be verified using actual system data and manufacturer performance curves.