Duct Calculator Elite vs P17
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Duct Calculator Elite
This app simplifies HVAC duct sizing calculations. It computes duct size, velocity, pressure drop, and flow rate with an intuitive interface. Supports various units and duct materials for precise HVAC design.
- Calculate duct size, velocity, pressure drop, flow rate
- Duct Size by Airflow mode
- Duct Size by Dimension mode
- Pressure Drop calculations
- Customizable units and duct materials
- Uses ASHRAE Handbook friction loss equations
Read full descriptionHide full description
Duct Calculator Elite™ replaces your ductulator wheel with fast, precise duct sizing built on the friction-loss equations of the ASHRAE Handbook — Fundamentals. Trusted by HVAC professionals, mechanical engineers, and contractors since 2013. One price — no subscriptions, no ads, no accounts. THREE CALCULATORS, ONE TAP APART • DUCT SIZE BY AIRFLOW — Set airflow and either velocity or friction, and solve for round and rectangular duct dimensions. Specify the rectangular aspect ratio to match your available space. The nearest standard round and rectangular sizes are shown with the friction they actually run at. • DUCT SIZE BY DIMENSION — Enter a round diameter or rectangular height and width, then lock airflow, velocity, or friction and solve for the remaining variables. • PRESSURE DROP — Convert between duct length, pressure drop, and friction. Find the exact pressure drop of a given installation, or the maximum duct length that maintains your design pressure drop. DESIGN TOOLS • FRICTION RATE — Enter your available static pressure and duct run, add fittings from a built-in list of typical equivalent lengths (elbows, tees, wyes, supply boots), and get your total effective length and target friction rate — the Manual D style residential design workflow. Then send the result straight into Duct Size by Airflow with one tap. • AIRFLOW FROM HEAT LOAD — Enter a sensible heat load and temperature difference to get the required airflow, corrected for air density. ENGINEERING-GRADE MATH Solves the Colebrook friction-factor equation directly for each duct material's surface roughness — the same method behind the ASHRAE friction chart — rather than interpolating from lookup tables. Roughness values come from Table 1 of the 2025 ASHRAE Handbook — Fundamentals, and the app shows you the one it used. Rectangular results use the Huebscher equivalent-diameter equation; air density is corrected for your temperature and elevation, and air viscosity for your temperature, so results hold up at altitude and outside room temperature. Below the turbulent range where the published methods agree, results are flagged as approximate. PRECISE ENTRY, BUILT FOR THE FIELD Type exact values directly in place — no cumbersome sliders, no pop-up entry screens. Confirm with a tap and every dependent value recalculates instantly. A clean layout keeps every result in view as you work, and everything runs fully offline. CONFIGURED FOR REAL JOB CONDITIONS • Duct dimensions: inches, centimeters, or millimeters • Airflow: CFM, cubic feet per second, cubic meters per second, cubic meters per hour, or liters per second • Velocity: feet per second, feet per minute, or meters per second • Pressure loss: inches of water per 100 ft or pascals per meter • Duct materials: galvanized steel, spiral steel, galvanized spiral (corrugated), aluminum, uncoated carbon steel, PVC plastic pipe, concrete, phenolic duct (pre-insulated), flexible duct (metallic), flexible duct (helix core, insulated), fibrous glass liner (spray coated), and fibrous glass liner (faced, smooth) • Air temperature (°F, °C, K) and elevation (feet or meters) corrections The next time you head to a meeting or out to the job site, leave the ductulator at home — everything you need is on your iPhone or iPad. Questions or ideas for the next version? Email techsupport@cyberprodigy.com — we read every message.
P17
Read full descriptionHide full description
Als Kunde der P17 Immobilienservice GmbH profitieren Sie von einem besonders innovativen Kundenservice, der Ihnen viele Freiheiten bietet. Mit der P17 App können Sie uns rund um die Uhr Anliegen und Schäden inklusive Fotodokumentation per Smartphone melden. Zusätzlich stellen wir Ihnen eine digitale Dokumentenmappe mit wichtigen Dokumenten für Ihre Immobilie(n) zur Verfügung. Über das digitale schwarze Brett informieren wir via Push-Nachricht proaktiv über wichtige Informationen rund um die uns anvertrauten Immobilien. Alle Vorteile auf einen Blick: - Schnelle und effiziente Kommunikation: In unserer P17 App finden Sie alle Informationen und Dokumentationen an einem Ort gebündelt – in Ihrer Hosentasche und jederzeit digital verfügbar - Immer informiert: Sie haben Fragen zum Mietvertrag, zur Nachbestellung von Schlüsseln oder zu Eigentümerversammlungen? In einem FAQ-Bereich finden Sie Antworten zu den häufigsten Fragen. - Interaktiv: Sie können in der P17 App direkt Schadensmeldungen oder andere Anliegen mit Fotos erfassen. Ihr Sachverhalt wird schnell bearbeitet und Sie erhalten regelmäßige Status-Updates per Push-Nachrichten. - Vernetzen Sie sich mit Ihren Nachbarn: Tauschen Sie sich per Nachrichtenfunktion mit Ihren Nachbarn zu wichtigen Themen im Haus aus. - Transparent: Alle wichtigen Informationen und Diskussionen können am schwarzen Brett nachverfolgt und kommentiert werden. So registrieren Sie sich für die P17 App: - Sie erhalten von uns eine personalisierte E-Mail mit einer Einladung zum Beitritt der P17 App - Drücken Sie auf den Button “Anmeldung bestätigen” und geben Sie Ihr persönlich gewähltes Passwort ein - Laden Sie sich die P17 App für Ihr Smartphone herunter - Und schon können Sie alle Vorteile unseres digitalen Kundenservices nutzen! Sie haben noch keine Einladung von uns erhalten? Dann melden Sie sich bitte bei Ihrem zuständigen Immobilienverwalter.
Screenshots
Verdict
The clearest difference is price: P17 at Free against Duct Calculator Elite's $9.99. P17 also leads on update cadence (every 2 months vs every 15 months). On ads, in-app purchases, device support and iOS requirement 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
P17 is free to download; Duct Calculator Elite costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Duct Calculator Elite ships an update every 15 months, P17 every 2 months. The most recent releases landed on November 6, 2026 and October 3, 2026 respectively.
| Parameter | Duct Calculator Elite | P17 |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.8 (234 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 234 — better | — |
| Update frequency | Every 15 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 13 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Cyberprodigy LLC | Idwell GmbH |
In-app purchases
Duct Calculator Elite
No in-app purchases
P17
No in-app purchases
Questions
Is Duct Calculator Elite free?
Is P17 free?
Do Duct Calculator Elite or P17 have ads?
Which is updated more often, Duct Calculator Elite or P17?
Other comparisons















