# Ductulator & Duct Calculator — Ductwork, HVAC Duct Sizing

> Ductwork, HVAC Duct Sizing (iPhone/iPad app by Vexor Digital LLC.)

- Source: https://appshunter.io/ios/app/ductulator-and-duct-calculator/id6801704799 (this page in markdown: same URL + `.md`)
- Developer: [Vexor Digital LLC](https://appshunter.io/developer/1884236036)
- Category: Utilities
- Price: Free with in-app purchases (on sale, was $24.99)
- Age rating: 4+
- Requires: iOS 16.0 · 13 MB
- Languages: American English, European Spanish
- Released: 2026-09-02
- Data updated: 2026-10-04

## What is Ductulator & Duct Calculator?

Stop calculating one duct at a time. Ductwork models the whole critical path—supply and return in series—and shows whether the run fits the pressure the equipment actually has left for duct.

Build the run, choose the airflow for each leg, and see where the pressure goes. Ductwork sizes round or rectangular duct, accounts for every length and fitting, identifies the element with the biggest loss, and shows a remedy when a larger stock size fixes the problem.

WHOLE-RUN DUCT SIZING

Supply and return are calculated together through the air handler, while each leg keeps its own airflow and duct size.

Choose the equipment pressure budget from a preset or enter a custom value. Filter, coil, supply register, return grille, and other losses are taken out before the duct is sized.

TWO CALCULATION METHODS

Use either:
• Equivalent length, where fittings are charged as additional straight-duct length
• Loss coefficients, where fittings are charged from their velocity pressure

Straight duct is calculated with Darcy-Weisbach and Colebrook-White friction factors.

BUILD THE ACTUAL RUN

Add straight duct and supported fittings including elbows, starting collars, offsets, and register boots.

Choose:
• round or rectangular duct
• galvanized, flexible, or lined material
• automatic stock sizing or a hand-set size
• imperial or metric units
• design temperature and elevation

Automatic sizing walks the available stock sizes and keeps 15% of the pressure budget in reserve.

SEE WHAT COSTS THE MOST

Ductwork shows:
• available and used pressure
• duct size and velocity
• friction and fitting losses
• the highest-loss element
• fits, fits but tight, or does not fit
• a larger stock size when one resolves the problem

The run is drawn to scale with supply, return, fittings, and the device in place.

REPORT THE RUN

The report uses the same solve as the calculator. It includes the drawing, verdict, pressure breakdown, both legs, every element and its loss, the calculation method, and the assumptions used.

The PDF is formatted for paper and can be sent through the iOS share sheet to Mail, Print, or Save to Files.

OFFLINE AND PRIVATE

All calculations work offline. Runs, saved jobs, and settings stay on the device. Nothing you enter about a run leaves the phone.

FREE

The free version includes the complete calculator: all supported fittings and materials, both calculation methods, imperial and metric units, the equipment pressure budget, run drawing, verdict and remedy, plus one saved job with unlimited edits.

ONE-TIME UNLOCK

A one-time in-app purchase unlocks additional saved jobs, job duplication, the full report, and PDF export. There are no subscriptions.

Ductwork models one linear residential critical path. It does not calculate loads, select equipment, balance branch systems, calculate duct leakage, perform psychrometrics, or provide CFM capacity for a chosen duct size.

Ductwork is a calculation aid for US residential practice. It is not ACCA-approved software and does not replace a Manual J/S/D package, permit submittal, inspection, design engineer, or professional judgment.

Privacy Policy: https://vexor.digital/legal/ductwork/privacy.html
Terms of Use: https://vexor.digital/legal/ductwork/terms.html

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HVAC Duct Calculator Lifetime | $24.99 | one-time |


## Is Ductulator & Duct Calculator safe?

Not enough ratings yet to assess Ductulator & Duct Calculator.

## Is Ductulator & Duct Calculator legit?

Ductulator & Duct Calculator appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Ductulator & Duct Calculator is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-09-24

A faster Ductulator, a new start screen and many small improvements.

### 1.0 — 2026-09-02

No release notes.

## Apps similar to Ductulator & Duct Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Ductulator: HVAC Calculator](https://appshunter.io/ios/app/ductulator-hvac-calculator/id6790622859) | — | Free | Utilities |
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All apps by Vexor Digital LLC: https://appshunter.io/developer/1884236036

## Related topics

[triple j ductwork](https://appshunter.io/ios/topics/triple-j-ductwork) · [ductwork](https://appshunter.io/ios/topics/ductwork)

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*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 2026-10-04.*