HVAC Toolkit Lite vs PT Ductulator

The HVAC ToolKit Lite is an easy-to-use app that has been created to assist HVAC engineers in checking their designs and making quick calculations and estimations. The app includes helpful calculation tools for calculating friction losses in ducting, pipe sizing, parking ventilation, staircase pressurization, and estimating heat loads, pump head, fan ESP, among others, where the user is able to enter the required inputs and is given the calculated output. Each tool also includes instructions and abbreviated formulas that have been used to calculate the results. The app can be set to metric or imperial units and/or to the English or Arabic language. Users are expected to have some knowledge and understanding of HVAC engineering in order to use the tools properly. Users are also expected to check that the results are within an acceptable range for their respective projects. If you come across any inconsistencies while using the app or have any recommendations for additional inclusions, please contact us.

This is the easiest duct sizing calculator you’ll ever use. PT Ductulator is a simple, modern duct sizing tool for HVAC technicians, designers, and students. No spinning wheels, no cluttered screens—just clean inputs and instant, easy-to-read results. Whether you’re on a rooftop, in an attic, or at the design desk, Ductulator helps you make fast, confident decisions about duct size, airflow, and comfort. Why it feels so easy - Straightforward layout – Type in what you know, see what you need. No hunting through menus. - Big, readable numbers – Designed for real job sites, not just a desk. - Instant feedback – Adjust a value and see airflow, friction, and velocity update right away. What you can do with it - Size round and rectangular ducts -Enter airflow and your target friction or velocity and get recommended duct sizes in seconds. - Compare duct options - See how changing size affects velocity and friction so you can avoid noise, hot spots, and high static. - Get equivalent round sizes - Convert rectangular duct dimensions to an equivalent round size to compare and explain choices. - Work anywhere All calculations run offline on your device. Perfect for basements, rooftops, and new construction sites. Built for HVAC pros Use Ductulator to: - Double-check proposed duct sizes before installation - Verify existing systems during service calls - Teach apprentices how size, airflow, and friction relate - Have clearer conversations with homeowners, builders, and inspectors If you work with ductwork, this is the ductulator you’ll actually want to use—fast, simple, and always in your pocket.