# WellCalc — Petroleum Engineering Calcs

> Petroleum Engineering Calcs (iPhone/iPad app by Ryan Tinklepaugh.)

- Source: https://appshunter.io/ios/app/wellcalc/id6761081416 (this page in markdown: same URL + `.md`)
- Developer: [Ryan Tinklepaugh](https://appshunter.io/developer/1883444651)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 13 MB
- Languages: American English
- Released: 2026-04-06
- Data updated: 2026-08-20
- User reviews in markdown: https://appshunter.io/ios/app/wellcalc/id6761081416/reviews.md

## What is WellCalc?

WellCalc is a field-ready petroleum engineering calculator for drilling, completions, production, reservoir, and well-control work. Keep the operating context beside the math instead of scattering it across screenshots and notes.

WORK FROM A FIELD JOB
- Save well name, field, measured depth, hole size, mud weight, and preferred unit system.
- Reuse that context across guided workflows and calculations.
- Keep recent work and saved scenarios organized by job.

CALCULATIONS YOU CAN REVIEW
- 97 calculations across 16 engineering categories.
- Guided Kill Sheet, Cement Requirements, Trip, Hydraulics, and Economics workflows.
- Formula source, formula-set version, operating note, expected range, and safety tier where applicable.
- Oilfield and metric units with explicit labels and dimensional checks.
- Saved favorites, calculation history, notes, and reference tables.
- Audit-ready PDF field reports and CSV data export.

FREE
- One Field Job.
- Well Control, Pipe & Annular, Pumps, Mud Engineering, and Unit Conversion categories.

WELLCALC PRO
- All calculation categories and guided workflows.
- Unlimited Field Jobs.
- Formula provenance throughout the library.
- PDF and CSV history export.

Your saved jobs and calculations stay on this device. WellCalc does not use generative AI or send calculations to an AI service.

Subscriptions renew automatically unless canceled in your Apple ID settings. Restore an existing purchase from Settings > Restore Purchases.

IMPORTANT: WellCalc is a field reference, not an engineering approval. Verify safety-critical outputs against the approved program, current measurements, equipment limits, and company procedures.

TERMS OF USE
Product Terms of Use: https://www.uncommonweather.com/legal/apps/wellcalc-terms.html
Apple Standard Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| WellCalc Pro Monthly | $4.99 | per month |
| WellCalc Pro Yearly | $29.99 | per year |



## Version history (last 5 releases)

### 1.0.9 — 2026-08-17

Two new calculators: Radius of Investigation (Well Testing) and Composite IPR (Production).
Formula set 2026.5: unified skin-factor computation across screens, refreshed provenance and per-calculator safety review, and expanded regression coverage. You will be asked to re-acknowledge the safety notice on each calculator once — formula-set updates always re-prompt.

### 1.0.8 — 2026-08-12

Help now opens the WellCalc support page directly, and the legal consent screens were refreshed. Your saved calculations and field jobs are unchanged.

### 1.0.7 — 2026-08-11

Added an always-visible operational-use notice to every calculator and clarified onboarding and paywall language so WellCalc is presented as a field reference, not a substitute for qualified engineering review.

### 1.0.6 — 2026-08-11

Added an always-visible operational-use notice to every calculator and clarified onboarding and paywall language so WellCalc is presented as a field reference, not a substitute for qualified engineering review.

### 1.0.5 — 2026-08-02

Faster field calculations, clearer well-control results, and refinements across the calculator library.

## More apps by Ryan Tinklepaugh

- [Anchor App Blocker](https://appshunter.io/ios/app/anchor-app-blocker/id6760245776)
- [Prep Clock: Backward Timer](https://appshunter.io/ios/app/prep-clock-backward-timer/id6760279596)
- [Stillpoint: 3am Reality Check](https://appshunter.io/ios/app/stillpoint-3am-reality-check/id6760322552)
- [Kept - Accountability Pacts](https://appshunter.io/ios/app/kept-accountability-pacts/id6760379382)
- [CostCurve](https://appshunter.io/ios/app/costcurve/id6761072942)

All apps by Ryan Tinklepaugh: https://appshunter.io/developer/1883444651

## Related topics

[roscoe moss calculator app](https://appshunter.io/ios/topics/roscoe-moss-calculator-app) · [stuck pipe calculator](https://appshunter.io/ios/topics/stuck-pipe-calculator)

---

*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 2026-08-20.*