# Bunker One

> Marine fuel standard calculator for ISO 8217 and ASTM standards. (iPhone/iPad app by Askapps.)

- Source: https://appshunter.io/ios/app/bunker-one/id439589227 (this page in markdown: same URL + `.md`)
- Developer: [Askapps](https://appshunter.io/developer/434706041)
- Category: Business, Education
- Price: Free
- Rating: 4.50/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 15.6 · 16 MB
- Languages: American English
- Released: 2011-05-30
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/bunker-one/id439589227/reviews.md

## What is Bunker One?

This application by Bunker One, is a small practicable tool for look up the ISO 8217 - 2005, 2010/2012, 2017 & 2024 standards for residual- and distillate marine fuels. 
Programmed calculators are included for different fuel related calculations.

Calculators programmed as below.:
-CCAI Number according ISO 8217
-Cetan Index	ASTM - D 976 - 80       (old method)
	ASTM - D 4737 - 87     (new method)
-Deviation calculations according Bunker One
-Energy and price relations according Bunker One
-Fuel Blending -	Viscosity blending according ASTM - D 7152
	Sulphur blending according Bunker One
-Injection temperature according Bunker One
-Reproducibility
-Specific Energy gross and net content according ISO 8217 
-Viscosity Index according ASTM - D 341
-Volume Correction Factor according ASTM D1250-80 Table 5B

General for all calculators is that all entries shall be in SI units. And results also given in SI units.
Where there is a differentiation between Distillates and Residual fuels, distillates are defined with density lower than 900 kg/m3
Where there is a differentiation between Straight Run fuel and Cracked fuels, straight run fuels are defined with density lower than 950 kg/m3

News published on our web page Bunkerone.com will be pushed to the app holders and publish with link to the web under the "news" bar

## Key features

- ISO 8217 fuel standard lookup
- CCAI Number calculation
- Cetan Index calculation (old & new methods)
- Fuel blending calculators (viscosity, sulphur)
- Injection temperature calculation
- Energy and price relation calculations
- News updates from developer


## Frequently asked questions about Bunker One

### What marine fuel standards does Bunker One support?

Bunker One supports ISO 8217 standards from 2005, 2010/2012, and 2017 for residual and distillate marine fuels. It also incorporates various ASTM standards for specific calculations.

### What types of calculations can I perform with Bunker One?

You can perform calculations for CCAI Number, Cetan Index, deviation, energy and price relations, fuel blending (viscosity and sulphur), injection temperature, specific energy, and viscosity index. Volume correction factors are also supported.

### Does Bunker One require specific units for input?

Yes, all entries for calculations in Bunker One must be in SI units. The results are also provided in SI units.

### How does Bunker One differentiate between fuel types?

Distillates are defined as fuels with a density lower than 900 kg/m³. Straight run fuels are defined as fuels with a density lower than 950 kg/m³.

### Can I get news and updates through Bunker One?

Yes, news published on the developer's website, Bunkerone.com, will be pushed to the app holders and can be accessed via the 'news' bar within the application.

### What devices is Bunker One compatible with?

Bunker One is available for iPhone and iPod devices. It was last updated on May 28, 2021.

### What is the age rating for Bunker One?

Bunker One has an age rating of 4+, making it suitable for a wide range of users.

### Does Bunker One have ads?

No, Bunker One does not contain advertisements. It is a free application.

## Version history (last 5 releases)

### 5.0.2 — 2026-08-24

General bug fixes and minor numerical corrections.

### 5.0.1 — 2026-07-25

Resolve UI bugs  
Update of contact information for Bunker One
Added ISO 8217: 2024 standards
Added calculator for reproducibility R

### 5.0.0 — 2026-07-21

Resolve readability issues on device with dark mode activated 
Update of contact information for Bunker One
Added ISO 8217: 2024 standards
Added calculator for reproducibility R

### 4.1 — 2021-05-28

In this update the contacts have been updated to include contacts for all different branches of bunkerone.

There have also been fixed some bugs in the fuel-calculator.

### 4.0 — 2021-02-02

We have added support for Live streaming, making it possible to see the bunkering process in certain cases

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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 2026-08-25.*