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tankertrackers/convert
======================

Convert freely between various types of petroleum-related fluid measurements

v1.0.0(3y ago)01.5kMITPHPPHP ^8.0

Since Mar 30Pushed 3y ago1 watchersCompare

[ Source](https://github.com/TankerTrackers/Convert)[ Packagist](https://packagist.org/packages/tankertrackers/convert)[ Docs](https://github.com/TankerTrackers/Convert)[ RSS](/packages/tankertrackers-convert/feed)WikiDiscussions master Synced 1mo ago

READMEChangelog (3)Dependencies (3)Versions (5)Used By (0)

Convert
=======

[](#convert)

This package is mainly concerned with converting between the following three units of measurement:

- [API Gravity](https://en.wikipedia.org/wiki/API_gravity)
- [Barrels per Tonne](https://en.wikipedia.org/wiki/Barrel_(unit))
- [Specific Gravity](https://en.wikipedia.org/wiki/Relative_density), AKA "Relative Density"

It was developed to be compatible with PHP 8.0 and greater and is intentionally as light-weight as possible, not requiring any external dependencies or relying on any non-standard PHP libraries.

> Please note that future versions may require PHP 8.1 and greater due to the built-in support for Enums that it offers. A new Major release of this library will be released if PHP version dependencies change. At the moment, no significant changes are planned that would require this package to require PHP 8.2 or greater.

Installation
============

[](#installation)

```
composer require tankertrackers/convert
```

Usage
-----

[](#usage)

If you are doing calculations on an oil grade with a specific gravity (relative density) of 0.983, you can create an `Gravity` object by calling on the appropriate static method on the `TankerTrackers\Convert` class like so: `Convert::gravity(0.983)`. If you wanted to see the corresponding API value for this Gravity value, you can instead call `Convert::gravity(0.983)->toApi()`.

Converting all three measurements between each other is done in the same way, and all three methods - `->toApi()`, `->toBpt()`, and `->toGravity()` - are available on all three measurements.

```
>>> TankerTrackers\Convert::api(34.12)->toBpt();
=> TankerTrackers\FluidMeasures\BarrelsPerTonne {#2684
     +value: 7.3613796475321,
   }

>>> TankerTrackers\Convert::bpt(6.59)->toGravity()
=> TankerTrackers\FluidMeasures\Gravity {#2686
     +value: 0.95437149864956,
   }

>>> TankerTrackers\Convert::gravity(1.19)->toApi()
=> TankerTrackers\FluidMeasures\ApiGrade {#2689
     +value: 5.897726515101,
   }

// You can also juggle types back and forth as much as you want.
>>> TankerTrackers\Convert::api(30)->toGravity()->toBpt()->toApi()->toBpt()->toGravity()->toApi()
=> TankerTrackers\FluidMeasures\ApiGrade {#2682
     +value: 30.0,
   }
```

> Note that the `$value` attribute is always returned as a `float`; even if the value is `1.0` it is not cast to an `int`.

You can also access the values directly by calling `->apiValue()`, `->bptValue()` or `->gravityValue()`. This gives the same value as converting to that measurement type and accessing the `$value` attribute:

```
>>> TankerTrackers\Convert::api(31)->toGravity()->value
=> 0.87076923076923

>>> TankerTrackers\Convert::api(31)->gravityValue()
=> 0.87076923076923
```

Future Development
------------------

[](#future-development)

### Api Grade Categories

[](#api-grade-categories)

In the future, this package may see some additional bells and whistles when it comes to analyzing the values of the various measurements. For example, the `ApiGrade` class might offer a `->getCategory()` method so that something like this is possible:

```
>>> $api = Convert::bpt(7.12)->toApi()
>>> $api->getCategory()
=> "Medium"
```

### Pre-defined Listings

[](#pre-defined-listings)

I might also consider adding a number of well known oil grades via `Enum` classes so that one can reference values directly, something like:

```
>>> \TankerTrackers\Common\Grade::ATHABASCA_BITUMEN->getApi()
=> 31.0
>>> \TankerTrackers\Common\Grade::ATHABASCA_BITUMEN->getGravity()
=> 0.87076923076923
```

### Improvements to Value Checking

[](#improvements-to-value-checking)

At the moment, the system trusts that the values you are entering are valid for that category, so it has no reason to suspect anything is weird if you ask it to create a `BarrelsPerTonne` object with the value of `-718`. Some sanity checks could be implemented that catch scenarios like this and throw Exceptions when we know something is out of the ordinary.

Copyright / License
===================

[](#copyright--license)

This library is released under an MIT License. See the `LICENSE` file for further details.

###  Health Score

32

—

LowBetter than 72% of packages

Maintenance20

Infrequent updates — may be unmaintained

Popularity17

Limited adoption so far

Community7

Small or concentrated contributor base

Maturity71

Established project with proven stability

 Bus Factor1

Top contributor holds 100% of commits — single point of failure

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

###  Release Activity

Cadence

Every ~537 days

Total

4

Last Release

1349d ago

Major Versions

v0.6.0 → v1.0.02022-08-29

### Community

Maintainers

![](https://www.gravatar.com/avatar/2005bc0510625184565d645acd62c9e54cbb1b692586276728e2293d2ce9b831?d=identicon)[Breki](/maintainers/Breki)

---

Top Contributors

[![BrekiTomasson](https://avatars.githubusercontent.com/u/7026735?v=4)](https://github.com/BrekiTomasson "BrekiTomasson (13 commits)")

---

Tags

conversionpetroleum

###  Code Quality

TestsPest

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```

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