# Petroleum Field Calculator — Oilfield Calculations

> Oilfield Calculations (iPhone/iPad app by Paul Femiak.)

- Source: https://appshunter.io/ios/app/petroleum-field-calculator/id1615163996 (this page in markdown: same URL + `.md`)
- Developer: [Paul Femiak](https://appshunter.io/developer/412802291)
- Category: Productivity, Education
- Price: $0.99 (on sale, was $1.99)
- Age rating: 4+
- Requires: iOS 17.6 · 4 MB
- Languages: American English
- Released: 2022-03-20
- Data updated: 2026-08-25
- User reviews in markdown: https://appshunter.io/ios/app/petroleum-field-calculator/id1615163996/reviews.md

## What is Petroleum Field Calculator?

Designed for engineers, students, and safety personnel in the upstream oil and gas industry, this easy-to-use app simplifies essential oilfield calculations. Quickly compute key drilling, well control, and production parameters with a streamlined interface.
	•	Comprehensive Calculations: Access a wide range of industry-standard formulas, including Hydrostatic Pressure, Mud Weight, and more.
	•	Seamless Unit Switching: Instantly convert between imperial and metric (SI) units with built-in conversion factors.
	•	Offline Access: No internet? No problem. Perform calculations anywhere, even in remote field locations.
	•	Efficient & Reliable: Save time with a self-contained, searchable list of calculations—no need to reference manuals or desktop software.

Whether you’re on-site, in training, or troubleshooting critical operations, this app is your go-to solution for fast, accurate oilfield calculations.


## Version history (last 5 releases)

### 1.0.9 — 2026-05-06

* Added support for Barrel (bbl) input in Mud Weight-Up with Barite calculations
* Added Metric Tons output for Barite Required calculations
* Minor UI and stability improvements

### 1.0.8 — 2026-05-04

* Added new calculations: Pipe Displacement (Steel), Bottoms Up (Strokes), Pipe Weight, Pipe Stretch, and Free Point
* Improved coverage for drilling, circulation, and pipe mechanics workflows
* Minor UI refinements and performance improvements

### 1.0.7 — 2026-02-20

•   Added new drilling hydraulics and pressure calculations, including Annular Velocity, Annular Pressure Loss, Bottom Hole Pressure, Equivalent Circulating Density (ECD), and Trip Margin (pressure method).
•   Minor improvements and refinements to UI.

### 1.0.6 — 2025-12-16

•	Added new calculations for Mud Dilution and Mixing Densities.
	•	Fixed decimal input issues for users in comma-based locales.
	•	Improved keyboard behavior on iPad running iOS 26.

### 1.0.5 — 2025-03-14

- Added an options menu with the ability to suggest a calculation.
- Minor bug fix.

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## More apps by Paul Femiak

- [Fox Detective](https://appshunter.io/ios/app/fox-detective/id1271158537)
- [The Backrooms](https://appshunter.io/ios/app/the-backrooms/id6443633934)
- [Petroleum Prices](https://appshunter.io/ios/app/petroleum-prices/id6449415277)

All apps by Paul Femiak: https://appshunter.io/developer/412802291

## Related topics

[paul femiak](https://appshunter.io/ios/topics/paul-femiak) · [oilfield calc](https://appshunter.io/ios/topics/oilfield-calc)

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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.*