The Friction Loss Calculator is also free and easy to use. But, it is requires you to have a device with internet access or downloaded an app.

The Friction Loss Slide Rule starts at ~$20, have a high probability for human error and (assuming the same formula is used) the slide rule is the least accurate of the four methods listed.

The Friction Loss Formula is also free to use. But, this method takes the most time, uses somewhat complex mathematics, and due to complexity has a very high probability of human error.

FireDepartment.net strives to provide fire departments & firefighters with quality tools. But, the user takes full responsibility for the information contained above. Use at your own risk!