Duct Calculator Elite

Name: Duct Calculator Elite
Price: 9.99 USD
Rating: 4.8 (231 reviews)
Author: Cyberprodigy LLC

HVAC Ductulator & Duct Sizing

$9.99 · Designed for iPad. Not verified for macOS.

231 Ratings
Age Rating

4+
Years
Category

Utilities
Developer

Cyberprodigy LLC
Language

EN
+ 7 More
Size

13.9
MB

New: Design Tools — calculate your Manual D friction rate and airflow from heat load, then send results straight into duct sizing. Plus a redesigned interface throughout. 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. • 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. Rectangular results use the Huebscher equivalent-diameter equation, with air density corrected for your temperature and elevation. 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, redesigned interface keeps results on screen 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, 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, aluminum, flexible duct (metallic), fibrous glass duct liner, smooth liner, uncoated carbon steel, PVC plastic pipe, and concrete • Air temperature (°F, °C, K) and elevation (feet or meters) corrections Available in English, Spanish, French, German, Portuguese, Japanese, Korean, and Chinese. 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.

Ratings & Reviews

4.8

out of 5

231 Ratings

Works just like a slide rule.
04/22/2020
HVAChacker2
When using on a system that was sized corectly per ACCA or whatever load calc program your country uses its spot on
Works just like a slide rule.
04/22/2020
HVAChacker2

When using on a system that was sized corectly per ACCA or whatever load calc program your country uses its spot on
Awesome
07/13/2013
Mark-W.
Very pleased with this app. The ability to change between units and set temperature/elevation is easy and very useful for what I need to do. Results are precise and accurate. Well done!
Awesome
07/13/2013
Mark-W.

Very pleased with this app. The ability to change between units and set temperature/elevation is easy and very useful for what I need to do. Results are precise and accurate. Well done!
Excellent, but one major omission
12/04/2023
Al.Barr
Excellent app, but you guys need to add m3/hr this is the only reason I don’t give you 5 stars
Excellent, but one major omission
12/04/2023
Al.Barr

Excellent app, but you guys need to add m3/hr this is the only reason I don’t give you 5 stars
Instructor
03/27/2025
Kees Droog
There is a bug in the APP. I use the APP in class and I noticed a bug that is new. Please fix it.
Instructor
03/27/2025
Kees Droog

There is a bug in the APP. I use the APP in class and I noticed a bug that is new. Please fix it.

• NEW Design tab: calculate your target friction rate from available static pressure, duct length, and fittings (Manual D style), then send it straight into Duct Size by Airflow • NEW Airflow from Heat Load: enter a sensible load and temperature difference to get density-corrected airflow • Redesigned interface with a cleaner, card-based layout • New inline value entry — edit any field in place and confirm with a tap • Lock friction in Duct Size by Dimension and solve for airflow and velocity • Localization improvements across all supported languages, plus compatibility updates for the latest iOS

Version 1.5.0 Jul 12

Data Not Collected

The developer does not collect any data from this app.

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Accessibility

Information

Seller: Cyberprodigy LLC
Size: 13.9 MB
Category: Utilities
Compatibility: Requires iOS 15.6 or later.

iPhone
Requires iOS 15.6 or later.

iPad
Requires iPadOS 15.6 or later.

iPod touch
Requires iOS 15.6 or later.

Mac
Requires macOS 12.5 or later and a Mac with Apple M1 chip or later.
Languages: English and 7 more

English, French, German, Japanese, Korean, Portuguese, Simplified Chinese, Spanish
Age Rating: 4+

4+

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