# Maritime Converter Pro — Marine Units & Ship Tools

> Marine Units & Ship Tools (iPhone/iPad app by Dmitriy Motorin.)

- Source: https://appshunter.io/ios/app/maritime-converter-pro/id6799078520 (this page in markdown: same URL + `.md`)
- Developer: [Dmitriy Motorin](https://appshunter.io/developer/1495533596)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, German (Germany), Brazilian Portuguese, Russian, Chinese (Simplified, China)
- Released: 2026-08-20
- Data updated: 2026-10-06
- User reviews in markdown: https://appshunter.io/ios/app/maritime-converter-pro/id6799078520/reviews.md

## What is Maritime Converter Pro?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Pro | $4.99 | one-time |



## Version history (last 2 releases)

### 2.0 — 2026-09-29

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.

### 1.0 — 2026-08-20

No release notes.

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## More apps by Dmitriy Motorin

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All apps by Dmitriy Motorin: https://appshunter.io/developer/1495533596

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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 2026-10-06.*