Duct Mate vs DuctSizer Pro

Duct Mate is the HVAC duct sizing tool built for the field — fast, offline, and transparent. Size ducts by CFM, analyze existing runs, find equivalent sizes, and calculate design friction rate from static pressure — all without creating an account or connecting to the internet. CORE TOOLS — ALL IN ONE APP ▸ Duct Size by Airflow Enter CFM, choose supply/return/exhaust, pick a shape and material, tap "Size" — get a recommended duct size instantly. Switch between friction and velocity methods. Supports round, rectangular, flex, and flat oval ducts with galvanized metal, flex duct, and duct board materials. ▸ Existing Duct Analyzer Got a duct that's already installed? Enter its size to find out how much CFM it can actually handle (Capacity Solver mode), or check what velocity and friction you're getting at a given airflow (Diagnostic mode). This is the reverse-sizing feature field techs have been asking for. ▸ Equivalent Duct Calculator Convert round to rectangular, rectangular to round, round to flat oval — every equivalent size shows cross-sectional area, equivalent diameter, and velocity change. Perfect for material swaps and retrofit work. ▸ Friction Rate Helper Calculate design friction rate the Manual D way: enter external static pressure, subtract component pressure losses (coil, filter, registers, grilles), divide by total equivalent length (supply + return). Built-in TEL calculator: simply tap a straight duct run, select fittings (14 types in the library), add equivalent length — no manual lookup tables needed. One tap to apply your friction rate back to the duct sizer. DESIGNED FOR THE FIELD • Works completely offline — no internet, no account needed • US (IP) and SI (metric) units with one-tap switching • Keyboard input, no cumbersome sliders • Quick-pick buttons for common CFM values and friction rates • Every result shows the formula, assumptions, and warnings • Save jobs, pin favorites, share results as text PRO FEATURES — ONE-TIME PURCHASE Unlock everything with a single purchase. No subscriptions. FREE —————————————— PRO ($4.99, one-time) Round, rectangular, flex ——— + Flat oval Return Air Helper ————————— + Return Air recommendations Room Split Calculator ———— + Room CFM planning 3 candidate sizes —————————— 18 candidate sizes 3 saved calculations ——————— Unlimited saves Text sharing ———————————————— + CSV & PDF export Standard settings —————————— + Advanced settings Friction Rate Helper —————— + Fitting Equivalent Length library TRANSPARENT, NOT A BLACK BOX Duct Mate is not a replacement for ACCA Manual D, but it's built to support Manual D workflows. Every calculation displays: • The underlying formula and assumptions • Standard air density (0.075 lb/ft³) • Material roughness and friction factor • Velocity limits with warnings when exceeded • Aspect ratio cautions for rectangular ducts • A clear disclaimer for professional verification TRUSTED BY HVAC PROS No subscription. No account. No data collection. Works offline wherever the job takes you. Download Duct Mate today — the duct sizer that works the way you do.

DuctSizer Pro is a fast HVAC duct sizing calculator built for field use. Enter duct dimensions and friction to calculate CFM, or enter CFM and friction to find suggested duct sizes. The app supports square, round, and oval ductwork and shows key airflow values such as velocity, friction, area, and equivalent round size. Features: - Calculate CFM from duct size - Find duct sizes from CFM - Supports square, round, and oval duct - Shows velocity, friction, area, and equivalent round size - Highlights suggested duct sizes - Compares alternate duct sizes for the same airflow DuctSizer Pro is designed as a quick reference tool for HVAC layout, estimating, and field calculations.