DuctWise HVAC Duct Calculator
by Yaniv van der Stigchel
· Utilities
· $4.99
On the App Store since September 2026
· Data updated
DuctWise HVAC Duct Calculator is made and published by Yaniv van der Stigchel. AppBrain is an independent app data site and isn't affiliated with Yaniv van der Stigchel. The app name, icon, screenshots and description belong to Yaniv van der Stigchel and are shown as published on the App Store.
AppBrain's verdict
- Best rank
- #67
- Top Paid, Canada
- Last updated
- October 20, 2026
Rankings
App Store top charts- Highest rank
- #67
- Chart
- Top Paid
- Utilities
- Country
- Canada
App Store Rankings for DuctWise HVAC Duct Calculator
Top rankings
| Rank | Country | Category | List |
|---|---|---|---|
| 67 | Canada | Utilities | Top Paid |
Ranking history in Canada
Competitors
Similar apps and more from Yaniv van der StigchelMore from Yaniv van der Stigchel
Releases
Updates seen on the App Store- Version
- 1.2
- Launched
- September 2026
No changelog data
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Technology
Found in the app by AppBrain- Price
- $4.99
- App size
- 5.77 MB
- Content rating
- Everyone
Technologies used by DuctWise HVAC Duct Calculator
About the app and developer
About DuctWise HVAC Duct Calculator
DuctWise HVAC Duct Calculator is an utilities app developed by Yaniv van der Stigchel.
User Ratings
The app has no ratings yet.
App Information
DuctWise HVAC Duct Calculator costs $4.99. The app size is 5.77 MB. The latest version available is 1.2. The last update was on October 20, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since September 2026.
Developer information for Yaniv van der Stigchel
Address:
Store listing
By Yaniv van der Stigchel, from the App Store
Screenshots by Yaniv van der Stigchel, from the the App Store listing
Description by Yaniv van der Stigchel Written by the developer, not by AppBrain. Click to read.
You already know how to size a duct. This agrees with your wheel, and then answers the part the wheel cannot.
Type the airflow and the friction rate. DuctWise gives you a round size the supply house actually stocks, the velocity that size will really run at, and the static the whole run will cost you — off the ASHRAE friction chart for galvanised round duct, the same chart the ductulator in your door pocket is printed from.
THE PART A WHEEL CANNOT DO
The round size was never the hard part. What fits in a 2x10 joist bay is. Tap once and you get every stocked rectangular size that carries the same air, squarest first, with anything past 4:1 flagged before you order it — and the flat-oval sizes beside them, for the spaces where a rectangle will not go.
It is equal friction, not equal area. A 20x8 does not carry what its area suggests, because the air drags past more metal on the way through. DuctWise uses Huebscher's equation, so the equivalents are honest.
IT KNOWS WHAT THE DUCT IS FOR
A bedroom branch and a shop main want very different velocities. Say which one you are running and every size is checked against the design band for that job — in the band, or above it, or below it, with the band drawn so you can see how close to the edge you are.
Supply trunk, supply branch, return trunk, return branch, commercial main, commercial branch, commercial return. Typical values from Manual D and ASHRAE Fundamentals, with a line on each saying why the band is where it is.
THE REST OF IT
Static over the run. Enter the total equivalent length — straight duct plus the fittings — and see what the duct costs you in inches of water, which is the number that has to fit inside the blower table.
Altitude correction. Friction loss falls with air density. A job a mile up loses about a sixth less pressure per 100 ft than the chart says, and the app accounts for it.
Inches and CFM, or millimetres and litres per second. Friction in in.wg/100ft or pascals per metre. Switch at any time with nothing to re-enter.
The friction chart for your airflow, with two sizes either side of the pick, so you can argue with the answer instead of taking it.
WHAT IT IS NOT
It does not calculate a heat load or a total effective length. It sizes one duct against one target. A whole system still needs Manual J and Manual D, and the job's specification governs. The app says so on its own Reference screen.
Works offline. No account.
Type the airflow and the friction rate. DuctWise gives you a round size the supply house actually stocks, the velocity that size will really run at, and the static the whole run will cost you — off the ASHRAE friction chart for galvanised round duct, the same chart the ductulator in your door pocket is printed from.
THE PART A WHEEL CANNOT DO
The round size was never the hard part. What fits in a 2x10 joist bay is. Tap once and you get every stocked rectangular size that carries the same air, squarest first, with anything past 4:1 flagged before you order it — and the flat-oval sizes beside them, for the spaces where a rectangle will not go.
It is equal friction, not equal area. A 20x8 does not carry what its area suggests, because the air drags past more metal on the way through. DuctWise uses Huebscher's equation, so the equivalents are honest.
IT KNOWS WHAT THE DUCT IS FOR
A bedroom branch and a shop main want very different velocities. Say which one you are running and every size is checked against the design band for that job — in the band, or above it, or below it, with the band drawn so you can see how close to the edge you are.
Supply trunk, supply branch, return trunk, return branch, commercial main, commercial branch, commercial return. Typical values from Manual D and ASHRAE Fundamentals, with a line on each saying why the band is where it is.
THE REST OF IT
Static over the run. Enter the total equivalent length — straight duct plus the fittings — and see what the duct costs you in inches of water, which is the number that has to fit inside the blower table.
Altitude correction. Friction loss falls with air density. A job a mile up loses about a sixth less pressure per 100 ft than the chart says, and the app accounts for it.
Inches and CFM, or millimetres and litres per second. Friction in in.wg/100ft or pascals per metre. Switch at any time with nothing to re-enter.
The friction chart for your airflow, with two sizes either side of the pick, so you can argue with the answer instead of taking it.
WHAT IT IS NOT
It does not calculate a heat load or a total effective length. It sizes one duct against one target. A whole system still needs Manual J and Manual D, and the job's specification governs. The app says so on its own Reference screen.
Works offline. No account.