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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.

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.

Pipe Head Loss 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