# Difference between Fanning friction factor and Darcy friction factor

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## Fanning friction factor

The Fanning friction factor is defined as follows:

ff = fd /4

Where;

ff =Fanning friction factor
fd =Darcy friction factor

## Darcy friction factor

The Darcy friction factor is defined as follows:

fd = 4 * ff

Where;

ff =Fanning friction factor
fd =Darcy friction factor

So, Darcy friction factor is 4 times higher than Fanning friction factor

The friction factor obtained from Moody chart is mainly the “Darcy Friction Factor”. So if we are taking about Moody Friction factor or Moody Friction Chart we are mainly referring to “Darcy Friction Factor”, we can calculate it from Colebrook–White equation when the flow is turbulent.

## Pipe Friction Head Loss Calculation

Pipe friction head loss calculation Pipe friction head loss calculation is important for sizing pumps, several equations have been developed to calculate pipe friction head loss, this article will explore the popular methods available.