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Pipe Head Loss Calculator

Friction head loss in a pipe run using Hazen-Williams, with fittings expressed as extra length.

Enter values

Results update as you type.

Result

Total head loss

7.149 m

Pressure drop
0.7011 bar
In psi
10.168
Equivalent length of fittings
12.8 m
Total equivalent length
112.8 m
Velocity
1.698 m/s
Loss per 100 m
6.338 m

About the Pipe Head Loss Calculator

Friction head loss in a pipe run using Hazen-Williams, with fittings expressed as extra length.

Also known as: friction loss calculator, head loss in pipe, pressure loss pipe, hazen williams loss.

How to use this calculator

  1. Enter inside diameter, pipe length, flow rate, hazen-williams c and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

h_f = 10.67 × L × Q^1.852 ÷ (C^1.852 × d^4.87)

Worked example

Using the values pre-filled in the calculator above:

  • Inside diameter = 50 mm
  • Pipe length = 100 m
  • Flow rate = 200 L/min
  • Hazen-Williams C = 140
  • Elbows = 4
  • Tees = 2
  • Valves = 2

the calculator returns:

  • Total head loss: 7.149 m
  • Pressure drop: 0.7011 bar
  • In psi: 10.168
  • Equivalent length of fittings: 12.8 m