# Oilcalcs — Ultimate oil & gas calculator

> Oil and gas industry calculator for volume, weight, density, and blending. (iPhone/iPad app by ron mooring.)

- Source: https://appshunter.io/ios/app/oilcalcs/id612283154 (this page in markdown: same URL + `.md`)
- Developer: [ron mooring](https://appshunter.io/developer/612283157)
- Category: Business, Utilities
- Price: $9.99
- Rating: 4.80/5 from 46 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 2 MB
- Languages: American English
- Released: 2013-04-16
- Data updated: 2026-09-03
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/oilcalcs/id612283154/reviews.md

## What is Oilcalcs?

The most complete, flexible and versatile calculator for professionals in the oil and gas industry!

Now optimized for iOS 26. 
Newly added features: 
- Calculator for Aromatics
- Added the following tables to the oil conversion screen: table 4, 8, 9, 10, 11, 12, 13, 14, 52, 56, 57, 58
- Added a field for density correction in the main calculator (and quantity editor) for the calculation of special applications in case a thermal expansion coefficient is not available
- Viscosity / pour point / flash point blender
- LNG density calculator
- Viscosity / Temperature calculator
- Density data for both the LPG and LNG density calculator are stored in the phone for easy retrieval

The app uses the ASTM tables / formulas to calculate weights and volumes based on entered density15, density20, relative density or API, observed volume, pressure and temperature, and calculates the following:
- Volume correction factor (to number of decimals of your own choice or as set by table Version)
- Metric tons (vacuum)
- Metric tons (air)
- GSV (M3 @15)
- BBLS (@60)
- Longtons
- Gallons

OilCalcs contains both ASTM 1980 and ASTM 2009 tables as well as the ASTM 1952 version of LPG Table 54, and users can select which table to use in the settings screen. Users can also select whether they want to calculate using SI Metric units or Imperial units.

Precision for VCF, GSV, MTons, LTons and Bbls can be changed using the settings screen. Settings are saved in the app so that when you use the app next time it will calculate with your chosen settings.

Densities can be entered in the following formats which are automatically recognized:
e.g 0.9664 / 966.4 / 9664

The app can calculate for crude oil, black and white products, lubrication oils and special applications, and input can be changed between density in vacuum at 15 and 20 deg C/ API / relative density / observed, and degrees Celsius / Fahrenheit by touching the applicable buttons.

The user has the choice to calculate using as input observed M3 / M3 at 15 / observed Barrels / Barrels 60 / Metric tons air/vac / Ltons / Gallons.

The user can also calculate weights of LPG / NGL, using either density @ 15C, relative density @60F, observed density or density @ 20C.

Aside from the conversion screen with conversions between API, observed density, density 15, density 20 and relative density, there is also a screen with conversions used in LPG / NGL.

For products, lube oils and crude there are two tools for calculating final density when blending two components: one tool that calculates the blend after loading the 2nd component, and another tool that lets the user choose the two components and advises which component to load first, based on density 15C or API 60F and actual temperature of the components. Both tools also calculate volume shrinkage due to blending.

A utility has been included that enables the user to export data from the calculator screen directly into a database for future reference. The same utility can be used to enter data manually and edit previously entered data.

For a detailed tutorial please visit our webpage (http://mooringmarineconsultancy.wordpress.com).
Download the manual here: https://mooringmarineconsultancy.wordpress.com/wp-content/uploads/2020/09/oilcalcs-for-iphone-user-manual.pdf

## Key features

- Volume and weight conversions
- Density correction for special applications
- Viscosity, pour point, and flash point blender
- LNG and LPG density calculators
- Support for ASTM tables and units
- Data export to database

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/oilcalcs/id612283154/reviews.md

### 5/5 — Great job

*2020-11-17*

Great job.I just bought IOS version today.But i used this app on android free version for a long time.If u add full terms of abbreviation at content this app is perfect.Like Vcf > volume correction factor etc.... Thz

## Frequently asked questions about Oilcalcs

### What is Oilcalcs?

Oilcalcs is a specialized calculator designed for professionals in the oil and gas industry. It offers a wide range of tools for volume and weight conversions, density calculations, and blending analysis, supporting various industry standards.

### What units does Oilcalcs support?

Oilcalcs allows users to select between SI Metric units or Imperial units for calculations. It supports conversions for API, observed density, density 15, density 20, and relative density, among others.

### Does Oilcalcs support different industry tables?

Yes, Oilcalcs includes support for ASTM 1980, ASTM 2009, and ASTM 1952 (LPG Table 54) tables. Users can select which table to use in the settings screen.

### Can I export my calculations from Oilcalcs?

Yes, Oilcalcs includes a utility that enables users to export data directly from the calculator screen into a database for future reference.

### What types of products can Oilcalcs calculate for?

The app can calculate for crude oil, black and white products, lubrication oils, and special applications. It also supports calculations for LPG/NGL weights.

### How is Oilcalcs priced?

Oilcalcs is a paid application, available for a one-time purchase of $9.99. There are no subscription fees or in-app purchases.

### Is Oilcalcs available on multiple devices?

Based on the provided data, Oilcalcs is optimized for iOS devices, specifically iPhones and iPods. It supports iOS versions 12 through 17.2.

### How often is Oilcalcs updated?

The latest version of Oilcalcs is 1.7.0, last updated on December 30, 2025. This indicates a commitment to regular updates and improvements.

## Version history (last 5 releases)

### 1.7.2 — 2026-08-19

Bugfixes and performance improvements.

### 1.7.1 — 2026-05-02

Bug fixes and performance improvements

### 1.7.0 — 2025-12-30

Bug fixes and performance improvements

### 1.6.0 — 2025-12-18

Bug fixes and performance improvements

### 1.5.9 — 2025-05-06

Optimized for iOS 18

## Apps similar to Oilcalcs

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [NK-SHIPS mobile](https://appshunter.io/ios/app/nk-ships-mobile/id1109981701) | — | Free | Business |
| [Orca Maritime Tools](https://appshunter.io/ios/app/orca-maritime-tools/id1528498935) | 5.0 (1) | Free | Business |
| [ASTM PRO](https://appshunter.io/ios/app/astm-pro/id6502639446) | 1.0 (1) | $14.99 | Business |
| [Integr8 Fuels](https://appshunter.io/ios/app/integr8-fuels/id1519724470) | — | Free | Business |
| [Saybolt Oil Calculator](https://appshunter.io/ios/app/saybolt-oil-calculator/id1499782959) | 5.0 (3) | Free | Business |
| [Saybolt Directory](https://appshunter.io/ios/app/saybolt-directory/id613093726) | — | Free | Business |

## More apps by ron mooring

- [Interpolator](https://appshunter.io/ios/app/interpolator/id635235982)
- [CargoSurveyor Tools](https://appshunter.io/ios/app/cargosurveyor-tools/id932816645)
- [AntiCollision](https://appshunter.io/ios/app/anticollision/id1505029525)

All apps by ron mooring: https://appshunter.io/developer/612283157

---

*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 2026-09-03.*