# Ductulator: HVAC Calculator — Airflow, CFM & Duct Sizing

> Airflow, CFM & Duct Sizing (iPhone/iPad app by Foster Apps LLC.)

- Source: https://appshunter.io/ios/app/ductulator-hvac-calculator/id6790622859 (this page in markdown: same URL + `.md`)
- Developer: [Foster Apps LLC](https://appshunter.io/developer/1836663142)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 29 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2026-07-31
- Data updated: 2026-08-09
- User reviews in markdown: https://appshunter.io/ios/app/ductulator-hvac-calculator/id6790622859/reviews.md

## What is Ductulator?

Stop guessing duct sizes.

Ductulator turns your airflow into the exact round or rectangular duct size you need — plus the friction rate, right from the job site.

Built for HVAC contractors and DIY installs alike:
• Round and rectangular sizing from CFM and target velocity, fully free
• Reverse mode — already have a duct size on hand? See what airflow it can carry (Pro)
• Branch calculator — size a trunk and every branch run at once, with a warning if they don't add up (Pro)
• Every duct material — Galvanized, Flex Duct, PVC, Fiberboard (Pro)
• Save sizings by job and share a polished PDF with your crew (Pro)

No account, no ads, no guesswork — just the numbers you need before you cut metal.

---

Privacy Policy: https://fosterapps.com/duct/privacy/
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Yearly | $19.99 | per year |
| Pro Weekly | $3.99 | per 7 days |



## Version history (last 2 releases)

### 1.0.1 — 2026-08-08

Minor fixes and improvements.

### 1.0.0 — 2026-07-31

No release notes.

## More apps by Foster Apps LLC

- [Planly: Daily Planner & Goals](https://appshunter.io/ios/app/planly-daily-planner-and-goals/id6755067558)
- [Home Maintenance & Checklist](https://appshunter.io/ios/app/home-maintenance-and-checklist/id6760983524)
- [Fix Muffled Sound: Water Eject](https://appshunter.io/ios/app/fix-muffled-sound-water-eject/id6762480310)
- [QR Code Maker: Sticker Print](https://appshunter.io/ios/app/qr-code-maker-sticker-print/id6769885631)
- [Migraine Diary & Headache Log](https://appshunter.io/ios/app/migraine-diary-and-headache-log/id6771950941)
- [PHP to USD Conversion](https://appshunter.io/ios/app/php-to-usd-conversion/id6790058242)

All apps by Foster Apps LLC: https://appshunter.io/developer/1836663142

## Related topics

[quietflex ductulator](https://appshunter.io/ios/topics/quietflex-ductulator) · [hvac duct size calculator](https://appshunter.io/ios/topics/hvac-duct-size-calculator)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-09.*