HVAC Duct Size Calculator
by Alan Cave
- Utilities
- Paid
- Zombie
- Rating
- 0.0
- 0 ratings
- Last update
- Aug 28, 2017
- Version 1.3
- Size
- 31 MB
- Category
- Utilities
- Tracked since
- Oct 23, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
This duct sizing app was created for HVAC design professionals who might normally use a "ductulator" to select an duct sizes.
The app goes beyond simply calculating velocity, friction, or volume; It also offers a list of every even sized duct that meet the design criteria for the user to review and consideration at various aspect ratios.
The app features a highly intuitive interface which allows the user to easily adjust values with precision (without the use of cumbersome "slider" controls), or alternatively to enter the values directly with a keypad interface.
Feel free to email comments and suggestions to [email protected]
What’s new
Release notes for the latest version, as written by the developer.
updated for 64 bit compatibility
Rank history
Daily position in the Lebanon charts. #1 is at the top.
- Best rank
- #1
- Current rank
- #4
- Days charting
- 2 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
53/100
Not flagged as small & simple
- Developer size10% · 25
Developer: 5 apps on the charts
- Audience size– · 20
No data, weight redistributed
- App size100% · 10
Size: 31 MB
- Price model100% · 15
Price model: paid
- Demand proof50% · 30
Best rank #1, 1 country
An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2
How the score worksVersion history
- 1.3LatestReleased Aug 28, 2017