# Duct Pressure Drop Calculator 1.0.0: first stable release

Source: https://meptools.com/blog/duct-pressure-drop-calculator-1-0-0

Duct Pressure Drop Calculator (MEC-01) hits 1.0.0. It's a single-page calculator for one
job: pressure drop on a single duct run.

## What it does

Friction loss comes from the Darcy-Weisbach equation with the Swamee-Jain approximation
for the friction factor; rectangular ducts get their equivalent diameter via the
Huebscher method before that formula runs. Fitting losses can be entered as a Sigma K
sum or built up from a fitting schedule. Velocity, Reynolds number, flow regime, and
Mach number are all shown alongside the result — not just the final pressure drop.

## Free, single page

No project file, no gate — enter the run, get the number, and the formulas behind it.