Maritime Converter Pro
Marine Units & Ship Tools
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Explore 24 measurement groups and 100+ units offline, alongside QNH, bunker, cargo and ETA calculators. Core tools are free.
Fast offline conversions for bridge, engine-room and cargo work. Maritime Converter Pro puts useful marine, pressure, fuel and engineering calculations in one focused app.
FREE TOOLS
• QNH and pressure: convert hPa, inHg, mbar, kPa, mmHg, psi, bar and atm.
• QFE to QNH: estimate sea-level pressure from field pressure, elevation and temperature.
• Bunker quantity: convert barrels or other volume units to mass using the density you enter, and convert mass back to volume.
• Marine and engineering units: 24 searchable groups and 100+ units, including distance, speed, mass, volume, pressure, area, time, angles, temperature, power, flow, viscosity, torque and energy.
• Sea time and ETA: calculate voyage time and estimated arrival from distance, speed and departure time.
• Diesel density: estimate density at a different temperature and calculate mass from volume.
• Stowage factor: convert m³/t and ft³/long ton, allow for broken stowage, and estimate cargo quantity from usable volume.
BUILT FOR PRACTICAL WORK
• Works offline after installation.
• Clear input units and calculation results.
• Quick access to QNH from the home screen.
• No account is required for the free calculators.
LIFETIME PRO
One non-consumable purchase unlocks unlimited calculation history, favorites and result sharing. Every calculator listed above remains free. The App Store shows the final local price before purchase.
IMPORTANT
QFE-to-QNH and diesel-density results are estimates based on the values and assumptions shown in the app. They do not replace approved operational tables, instruments, cargo documents or professional procedures. Verify critical calculations against the standards required for your operation.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
A new marine converter with 24 searchable measurement groups and 100+ units. Added sea time and ETA, bunker quantity, diesel density, and stowage tools. QNH remains available. Improved offline access and iPad layouts.
The developer, Dmitriy Motorin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Dmitriy Motorin
- Size
- 3.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 4 more
- English, German, Portuguese, Russian, Simplified Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime Pro $4.99
- Copyright
- © 2026 Dmitriy Motorin