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First release of Ductwise, a duct size calculator for HVAC techs. • Duct size, round and rectangular • CFM, BTU room load and duct velocity • Superheat and subcooling for 7 refrigerants (Pro) • Saved jobs with a PDF duct schedule (Pro) • Imperial or metric, works offline
Duct size, CFM, velocity & BTU load for HVAC techs. Works offline.
Size ducts in seconds. Ductwise is a duct size calculator for HVAC techs and installers. Enter CFM and friction rate to get the round duct size, the rectangular equivalent and the air velocity. FREE TOOLS - Duct size (round and rectangular), equal-friction method - CFM and airflow: from a duct and its velocity, a sensible load, tonnage or air changes - BTU room load estimate - Duct velocity (fpm), velocity pressure and friction, checked against your own limit BUILT FOR THE JOB SITE - Big, high-contrast numbers you can read at arm's length - Imperial or metric - Set your friction rate and max velocity once; every tool starts from them - Works fully offline, with no ads and no account DUCTWISE PRO (ONE-TIME PURCHASE) - Superheat and subcooling for R-410A, R-32, R-454B, R-22, R-134a, R-407C and R-404A - Size every trunk and branch in one job - Saved jobs and PDF duct schedule Pay once. No subscription. The method is shown on every result, so you can check it against the duct calculator you already carry. Results are guidance; verify against your design standard.
past month, based on 1 day
Downloads
Low confidence5
From install count ÷ months since release
In-app revenue
Low confidence$3
From downloads × revenue per download
Ads
$0
No ads
Total
$3
In-app + ads
Google Play only. Downloads from daily Top free ranks (or the store's install count); in-app revenue from Top grossing ranks, calibrated on AppTweak's US estimates, or else from downloads; ads from public ad benchmarks. Not reported figures.