Pump Head Calculator

Estimate total dynamic head by combining static lift, friction loss, and discharge pressure head in one quick worksheet.

Pipe length (m)Pipe diameter (mm)Flow rate (m3/h)Number of fittingsStatic elevation difference (m)Required discharge pressure (bar)

Hazen-Williams C factorTypical values: 120 for older steel pipe, 130 for clean commercial steel, 140+ for smooth plastic pipe.

Equivalent length

139.2 m

Friction loss

11.88 m

Pressure head

12.24 m

Total dynamic head

42.11 m

Formula reference

TDH formula

TDH = Static Head + Friction Loss + Pressure Head

Hazen-Williams loss

hf = 10.67 x L x Q^1.852 / (C^1.852 x d^4.8704)

This calculator assumes water-like service and treats each fitting as an equivalent length of roughly 30 pipe diameters.

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What this calculator is best for

This tool is designed for first-pass TDH estimation on water-like services such as clean water transfer, booster skids, and utility circulation. It is useful when the team needs a quick check before comparing pump curves or sizing a VFD range.

How the assumptions work

Friction loss is estimated with the Hazen-Williams equation and a simplified equivalent length for fittings. That makes the result fast and practical for preliminary engineering, but it should not replace a detailed hydraulic model when control valves, non-water fluids, or long suction/discharge runs are involved.

When to use a more detailed model

If the fluid is viscous, non-Newtonian, slurry-laden, or temperature-sensitive, move to a Darcy-Weisbach calculation or a full system model. Projects with several operating cases should also compare TDH at minimum, normal, and maximum flow rather than relying on a single duty point.

Häufig gestellte Fragen

What does TDH include?

TDH includes static elevation difference, friction loss across the line, and any pressure head required at the discharge point.

Why is a C factor required?

The Hazen-Williams C factor represents pipe roughness. Lower values mean rougher pipe and higher friction loss.

Can I use this for chemicals or slurry?

Use it only as a rough screen. For non-water fluids, especially viscous or solids-laden service, use a more detailed hydraulic model.

Haftungsausschluss: This calculator provides an engineering estimate for early sizing and RFQ review only.