Duct Calculator - DuctCalc

About this app

Professional HVAC duct sizing and psychrometric calculations in one powerful app. DuctCalc replaces your physical ductulator with a modern, accurate digital tool trusted by engineers, contractors, and HVAC professionals. DUCT SIZING CALCULATOR Size round, rectangular, and flexible ductwork with ASHRAE-compliant calculations: • Forward Mode: Enter CFM airflow → Get multiple duct size options with velocity, friction loss, and pressure drop for each • Reverse Mode: Select a duct size → See CFM capacity at minimum, ideal, and maximum velocities Supports 6 duct materials: - Galvanized Steel - Flex Duct (extended & compressed) - Duct Board - Fiberglass Lined - PVC/Plastic FITTINGS & PRESSURE DROP Calculate total equivalent length and pressure loss with 10+ standard fittings: - 90° and 45° Elbows (smooth, 3-piece, mitered) - Tees (branch and straight-through) - Reducers and Transitions - Takeoffs (90° and 45°) - Register Boots PSYCHROMETRIC CALCULATOR Complete humid air property analysis with interactive chart: • 4 Input Modes: Dry bulb + wet bulb, relative humidity, dew point, or humidity ratio • Calculates: Enthalpy, specific volume, vapor pressure, saturation pressure, degree of saturation • Altitude correction for non-standard atmospheric pressure • Visual psychrometric chart showing current state point APPLICATION TYPES Pre-configured velocity limits per ASHRAE/ACCA guidelines: - Residential Supply (400-1000 FPM) - Residential Return (300-800 FPM) - Commercial Low Velocity (600-1500 FPM) - Commercial High Velocity (1000-2500 FPM) PROFESSIONAL FEATURES Imperial (I-P) and Metric (SI) units Airflow in CFM, m³/h, or L/s Color-coded status indicators Real-time validation warnings Built-in reference documentation Standard duct size tables (ASHRAE/SMACNA) WHY DUCTCALC? Unlike other apps that only size ducts OR calculate psychrometrics, DuctCalc combines both essential HVAC tools. No more switching between apps. Professional-grade accuracy in your pocket. Perfect for: • HVAC Engineers • Mechanical Contractors • MEP Design Firms • HVAC Technicians • Building Inspectors • Engineering Students Download DuctCalc and replace your old ductulator with the modern HVAC calculator trusted by professionals. Privacy Policy: https://docs.google.com/document/d/1r9oCuYYtQZlKWhZTlrP8Ck73V6NoR8lx82027oWszsA/edit?usp=sharing Terms of Service: https://docs.google.com/document/d/1MAY_7_uIVMnf4QYSpeaaSaSV7cm3-TJApqYVLfTHQ7w/edit?usp=sharing

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 20, 2026 · 4:02 PM Free