leave the paper duct calculator behind
Duct Design Calculator
Ductulate HD provides a quick and simple way to calculate any combination of air volume, velocity, pressure loss and duct size (rectangular or round).
With dual speed scrolling, adjustable markers and a scroll lock, Ductulate HD is the most user friendly duct calculator available.
Ductulate HD supports both imperial and metric units and can also be used as a conversion tool if necessary.
Customize The Look
Make it your own by adding your company artwork to any of the included themes.