Duct Calculator Elite vs MasterBuilder Pro

Duct Calculator Elite™ replaces your ductulator wheel with fast, precise duct sizing built on the friction-loss equations of the ASHRAE Handbook — Fundamentals. Trusted by HVAC professionals, mechanical engineers, and contractors since 2013. One price — no subscriptions, no ads, no accounts. THREE CALCULATORS, ONE TAP APART • DUCT SIZE BY AIRFLOW — Set airflow and either velocity or friction, and solve for round and rectangular duct dimensions. Specify the rectangular aspect ratio to match your available space. The nearest standard round and rectangular sizes are shown with the friction they actually run at. • DUCT SIZE BY DIMENSION — Enter a round diameter or rectangular height and width, then lock airflow, velocity, or friction and solve for the remaining variables. • PRESSURE DROP — Convert between duct length, pressure drop, and friction. Find the exact pressure drop of a given installation, or the maximum duct length that maintains your design pressure drop. DESIGN TOOLS • FRICTION RATE — Enter your available static pressure and duct run, add fittings from a built-in list of typical equivalent lengths (elbows, tees, wyes, supply boots), and get your total effective length and target friction rate — the Manual D style residential design workflow. Then send the result straight into Duct Size by Airflow with one tap. • AIRFLOW FROM HEAT LOAD — Enter a sensible heat load and temperature difference to get the required airflow, corrected for air density. ENGINEERING-GRADE MATH Solves the Colebrook friction-factor equation directly for each duct material's surface roughness — the same method behind the ASHRAE friction chart — rather than interpolating from lookup tables. Roughness values come from Table 1 of the 2025 ASHRAE Handbook — Fundamentals, and the app shows you the one it used. Rectangular results use the Huebscher equivalent-diameter equation; air density is corrected for your temperature and elevation, and air viscosity for your temperature, so results hold up at altitude and outside room temperature. Below the turbulent range where the published methods agree, results are flagged as approximate. PRECISE ENTRY, BUILT FOR THE FIELD Type exact values directly in place — no cumbersome sliders, no pop-up entry screens. Confirm with a tap and every dependent value recalculates instantly. A clean layout keeps every result in view as you work, and everything runs fully offline. CONFIGURED FOR REAL JOB CONDITIONS • Duct dimensions: inches, centimeters, or millimeters • Airflow: CFM, cubic feet per second, cubic meters per second, cubic meters per hour, or liters per second • Velocity: feet per second, feet per minute, or meters per second • Pressure loss: inches of water per 100 ft or pascals per meter • Duct materials: galvanized steel, spiral steel, galvanized spiral (corrugated), aluminum, uncoated carbon steel, PVC plastic pipe, concrete, phenolic duct (pre-insulated), flexible duct (metallic), flexible duct (helix core, insulated), fibrous glass liner (spray coated), and fibrous glass liner (faced, smooth) • Air temperature (°F, °C, K) and elevation (feet or meters) corrections The next time you head to a meeting or out to the job site, leave the ductulator at home — everything you need is on your iPhone or iPad. Questions or ideas for the next version? Email techsupport@cyberprodigy.com — we read every message.

The all-in-one construction calculator built for Australian tradies. MasterBuilder Pro gives you 55 professional calculators across 8 trades — Carpentry, Electrical, Plumbing, Concreting, Roofing, Bricklaying, Plastering, and Landscaping. Every calculator follows Australian Standards (AS/NZS) and the National Construction Code (NCC 2025). CALCULATE FAST ON SITE - Deck, stair, timber span, roof truss, pergola and more - Cable sizing, voltage drop, max demand, solar estimator - Pipe sizing, drainage fall, hot water, gas pipe, rainwater tank - Concrete slab, footings, steps, stumps, mix ratios - Roof area, tiles, metal sheets, battens, gutters, insulation - Brick walls, block walls, mortar, lintels, retaining walls - Plasterboard, render, cornice, skim coat, wall insulation - Paving, fencing, turf, soil, retaining walls, irrigation GENERATE PROFESSIONAL QUOTES - PDF quotes with your business name, ABN, licence, and insurance - Quote or Estimate toggle with legally correct wording - State-specific deposit caps (NSW, VIC, QLD, SA, WA, TAS) - Client signature line, terms and conditions, cooling-off notice - Combine multiple calculations into one project quote COMPARE PRICES INSTANTLY - Search major Australian hardware stores - See the cheapest price across multiple retailers - Barcode scanner for quick product lookup AI-POWERED VISUALISATION - Take a photo of any room or job site - Describe changes — new flooring, lighting, paint colours - See a photorealistic preview before you start work BUILT FOR AUSTRALIAN TRADIES - 348 default material prices from Australian suppliers - NCC 2025 and AS/NZS compliance checks on every calculation - Voice calculator with unit conversions - Save projects, track favourites, view calculation history - Works offline — all calculators run on your device Free to try with 3 calculators. Upgrade to Pro to unlock all 55 calculators, pricing, quotes, Compare, and Imagine. Terms of Use: https://masterbuilderprodev.github.io/masterbuilder-pro/terms.html Privacy Policy: https://masterbuilderprodev.github.io/masterbuilder-pro/privacy.html