# Ductulator - Duct Sizing

> HVAC Duct Design Calculator

Canonical page: [https://chrome-stats.com/d/id1474939475](https://chrome-stats.com/d/id1474939475)

## Overview

- **ID:** `id1474939475`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Wassim Murr
- **Category:** Productivity
- **Rating:** 4.70 / 5 (341 ratings)
- **Version:** 3.5
- **Last updated:** 2026-03-24
- **First published:** 2019-08-13
- **Size:** 1.18 MB
- **Data as of:** 2026-09-20
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/ductulator-duct-sizing/id1474939475)
- **Privacy policy:** [https://llamaart.com/ductulator/privacyPolicy/PrivacyPolicy-EN.pdf](https://llamaart.com/ductulator/privacyPolicy/PrivacyPolicy-EN.pdf)

## Description

Ductulator is a fast HVAC duct sizing calculator that saves time on duct design. Size ducts instantly based on friction rate or velocity and get multiple valid dimensions in seconds. It supports rectangular, circular, and flexible ducts and updates friction and velocity automatically. IP and SI unit support.

Details mode lets you tweak duct dimensions and airflow to fit your project, while you can toggle between calculation methods and review several options at once. Ideal for engineers and HVAC professionals who want quick, reliable duct sizing without charts.

## Rankings

- #84,655 — Overall

## Review summary

Overall, users praise the app for field usability and practical sizing options, and its ability to replace older tools. However, repeated drawbacks include limited/customizable duct sizes, problematic or missing Flex features, update-related regressions, missing duct shapes (oval, round/square), and size-related calculation constraints. A few users also noted unexpected billing charges. The app remains useful but has clear feature gaps and update concerns.

### Pros

- Very easy to use in the field; users report it's easy to operate and handy for measuring duct runs.
- Offers multiple sizing options for ducts (CFM, velocity) and different duct configurations.
- Handy for measuring and sizing duct runs in real-world field work.
- Useful tool that can replace older duct sizing tools like the traditional Ductulator.

### Cons

- Inability to input custom duct sizes and limited size options; non-sequential size steps (e.g., jumps like 24 to 26).
- Flex option issues: the new flex option isn’t working properly or isn’t selectable in calculations.
- Update regressions: some users feel the newer version regressed functionality and should revert.
- Missing flat oval duct support and limited duct shapes; users want round/square options as well.
- Size limitations hinder precise calculations (friction rate/CFM) and make some common sizes hard to analyze.

## Similar extensions and apps

- [Duct Calculator: HVAC Sizing](https://chrome-stats.com/d/id6789039757)
- [Duct Calculator.](https://chrome-stats.com/d/id6756908372) — 4.70 / 5
- [HVAC Duct Size Calculator](https://chrome-stats.com/d/id485800827) — 5.00 / 5
- [Duct Sizer Calc HVAC](https://chrome-stats.com/d/id6764646921)
- [DuctSizer: Duct Calculator](https://chrome-stats.com/d/id6788267429)
- [Duct Calculator Elite](https://chrome-stats.com/d/id665701601) — 4.80 / 5
- [PT Ductulator](https://chrome-stats.com/d/id6755953588)
- [ASHRAE HVAC Duct Sizer](https://chrome-stats.com/d/id1273371824)
- [DuctPro](https://chrome-stats.com/d/id6771761655)
- [Air Duct Size Calculator](https://chrome-stats.com/d/id6761648095) — 5.00 / 5
- [Duct Calculator](https://chrome-stats.com/d/id1078238132) — 4.50 / 5
- [Ductulator - Duct Calculator](https://chrome-stats.com/d/id6757307937) — 4.60 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1474939475)