Make it easier than ever to calculate duct dimensions!

The Ductulator - Duct Sizing Calculator is an accurate, easy-to-use duct size calculator that can be held in your hand. The rotating calculator is used for sizing supply and return duct systems using the equal friction design method. Measurements include scales for friction loss per unit length, air volume, air velocity, round duct diameter and rectangular duct diameters. The Ductulator provides measurements in both English units and Metric units, and also comes with a protective sleeve with ASHRAE recommended design air velocities for system components/applications.