Ductulator: HVAC Calculator

Stop guessing duct sizes. Ductulator turns your airflow into the exact round or rectangular duct size you need — plus the friction rate, right from the job site. Built for HVAC contractors and DIY installs alike: • Round and rectangular sizing from CFM and target velocity, fully free • Reverse mode — already have a duct size on hand? See what airflow it can carry (Pro) • Branch calculator — size a trunk and every branch run at once, with a warning if they don't add up (Pro) • Every duct material — Galvanized, Flex Duct, PVC, Fiberboard (Pro) • Save sizings by job and share a polished PDF with your crew (Pro) No account, no ads, no guesswork — just the numbers you need before you cut metal. --- Privacy Policy: https://fosterapps.com/duct/privacy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/