Ductulator vs Duct Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ductulator
Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.
- Instant duct sizing
- Friction rate or velocity calculation
- Multiple valid duct dimensions
- IP and SI units support
- Detailed sizing mode
- Rectangular, circular, and flexible ducts
Read full descriptionHide full description
Size HVAC ducts instantly using airflow, friction or velocity. Get accurate duct dimensions in seconds — no charts required. • Get a range of suitable duct sizes based on friction rate or velocity. • Get multiple valid duct dimensions instantly. • Tap on Friction Rate or Velocity to toggle between calculation methods. • IP and SI units. • Detailed sizing mode to adjust the duct dimensions and air flow rates. • Supports rectangular, circular and flexible ducts. • Automatic friction and velocity updates. Calculations are based on standard air 0.075 lb/ft3 (1.2 kg/m3) in clean galvanized steel or non-metallic flexible ducts. Any feedback is welcome, and will be the basis for future updates.
Duct Calculator
This professional HVAC utility assists engineers and technicians with precise duct sizing and airflow calculations for ventilation systems. It simplifies essential calculations for both design and installation work, improving on-site efficiency.
- Calculate duct sizes using airflow (CFM) and velocity (FPM)
- Supports rectangular and round duct sizing in inches
- Determine air flow rate in CFM
- Calculate air velocity in FPM
- Simple interface for fast on-site calculations
Read full descriptionHide full description
Duct Calculator is a focused duct sizing tool for HVAC engineers, designers and installation technicians. Enter what you know and get the duct dimensions, airflow or air velocity you need, without a chart or a slide rule. CALCULATIONS - Duct size: find the required duct dimensions from airflow (CFM) and air velocity (FPM). - Airflow: determine the airflow rate in CFM. - Air velocity: determine velocity in FPM to help verify system performance. DUCT SHAPES - Round ducts - Rectangular ducts - Results shown in inches WHO IT IS FOR - HVAC engineers and designers checking a duct size during design work. - Installation technicians and contractors who need a quick answer on site. - Students learning how airflow, velocity and duct size relate. WHERE IT HELPS - Sizing a new supply or return run from a known CFM. - Checking whether an existing duct keeps velocity within your target. - Comparing a round duct with a rectangular one when space is tight. SIMPLE BY DESIGN A clean interface with only the inputs you need, so you get an answer quickly on the job. Duct Calculator is free to use. An optional one-time upgrade removes ads. Results are intended as a calculation aid. Always confirm designs against applicable codes and project requirements. Download Duct Calculator and size your next duct run. Privacy Policy : https://semiconhub.in/manager/privacy.html Terms and Condition : https://semiconhub.in/manager/tcondition.html
Screenshots
Verdict
The clearest difference is price: Duct Calculator at Free against Ductulator's $3.99. Duct Calculator also leads on iOS requirement (15.6 vs 18.6). Ductulator's advantage is in-app purchases (none vs 1) and ratings volume (358 vs 3). On rating, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Duct Calculator is free to download; Ductulator costs $3.99 up front. Duct Calculator sells 1 one-off in-app purchase. Ductulator asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for Ductulator against 4.7 for Duct Calculator. That said, the two scores are not equally well evidenced: Ductulator has 358 ratings behind it against 3, so its average is the more settled of the two.
Ductulator ships an update every 2 months, Duct Calculator every 10 months. The most recent releases landed on October 29, 2026 and October 26, 2026 respectively.
| Parameter | Ductulator | Duct Calculator |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.7 (358 ratings) — better | 4.7 (3 ratings) |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 358 — better | 3 |
| Update frequency | Every 2 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | #57 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 1 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Wassim Murr | Sachinbhai Surani |
Customer experience
Ductulator
Duct Calculator
Bugs and requests
Ductulator
Reported bugs
4 issues- Decimal point doesn't work on calculator
- New flex option isn't working properly
- Friction rate can't be changed in the latest version
- Skips duct sizes (e.g., 24-26)
Requested features
5 requests- Ability to pick duct size and see CFM
- Include flat oval ducts
- Option to select round or square duct
- Ability to enter duct size and get CFM
- Option for flex duct
Duct Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ductulator
No in-app purchases
Duct Calculator
- Lifetime premium$9.99
Questions
Is Ductulator free?
Is Duct Calculator free?
Which has better reviews, Ductulator or Duct Calculator?
Do Ductulator or Duct Calculator have ads?
Which is updated more often, Ductulator or Duct Calculator?
Other comparisons
