---
title: "Drilling Calculator for Rigs - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "DERRICK is a fast, accurate drilling and well-control calculator for the rig floor. Set up your well once and every calculator pre-fills from it, so you only change what is different today. Built for "
---

# Drilling Calculator for Rigs — United States
> Well Control, Kill Sheet, Mud

![Drilling Calculator for Rigs App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/52/af/ec/52afec45-7518-4d20-19ae-042b0c16c93a/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Aneesh Pradeep](https://apptail.io/developer/aneesh-pradeep-QIxDeb)
**Category:** Utilities
**Rating:** N/A (0 ratings)
**Price:** $1.99
**Bundle ID:** com.steppesummit.derrick
**Store:** Apple App Store
**Country:** United States
**Version:** 7 (released 2026-10-02)
**Original Release:** 2026-07-06
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6785307917)
**AppTail Page:** [https://apptail.io/app/drilling-calculator-for-rigs-ftMA/united-states](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/united-states)

## Drilling Calculator for Rigs Description
DERRICK is a fast, accurate drilling and well-control calculator for the rig floor. Set up your well once and every calculator pre-fills from it, so you only change what is different today. Built for drilling engineers, toolpushers, company men, mud engineers, and students who need the right number under pressure.

- Your active well pre-fills every calculation. Less typing, fewer mistakes.
- Tap show your work on any result to see the formula with your exact numbers.
- Works fully on device. No account, no sign-in, no tracking.
- Field or SI units on every input and result.
- iPhone and iPad, with a purpose-built two-pane layout on iPad.

CALCULATORS
- Pressure and gradient: hydrostatic pressure, equivalent mud weight, equivalent circulating density, bottomhole pressure.
- Well control: kill mud weight, formation pressure, MAASP, LOT and FIT to EMW, kick tolerance, gas expansion.
- Hydraulics: pump output, annular velocity, strokes and lag, bit hydraulics.
- Volumes and capacities: pipe and hole capacity, annular capacity, pipe displacement, slug volumes.
- Mud and tubulars: weight up with barite, buoyancy factor, trip margin, and more.

MUD WEIGHT WINDOW
- See pore pressure, mud weight, ECD and fracture across the whole hole.
- Tap or drag the chart to read every value and your margins at any depth.

KILL SHEET
- Enter shut-in pressures and get kill mud weight, ICP, FCP and a step schedule.
- Automatic gas influx indication from the casing to drillpipe differential.

AI CO-PILOT
- Ask questions grounded in your active well and get clear, field-ready answers.
- Explain any calculation, interpret a kick, or draft an end of tour handover.
- Decision support only. It always defers to written procedure and the on-site supervisor.

HISTORY AND EXPORT
- Save any result to your well log with a note, then filter and search the log.
- See your activity heatmap and export clean reports.

Unlimited wells, the full history, export and reports, unlimited AI, and specialist modules like casing design.

PRIVACY
- Your wells and calculations stay on your device. No analytics, no ads, no tracking.

SAFETY
- DERRICK assists calculation. It does not replace your company well-control procedures, the well program, or the judgment of the on-site supervisor. Always verify independently before acting.

Terms of Use: 

## Drilling Calculator for Rigs Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/49/70/1e/49701e84-d9f9-c02a-09ab-39d4739bc8d3/01_window.png/1320x2868.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e2/52/c4/e252c429-a88b-f78f-e58b-dd9cd34dc541/02_dashboard.png/1320x2868.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2d/bf/f0/2dbff0f7-942b-523e-2af5-a356205e6b6f/03_showwork.png/1320x2868.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/02/46/9f/02469fb3-30c0-b2b0-f67b-d5450c4f7f0f/04_ai.png/1320x2868.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/4e/6d/2c/4e6d2c12-5928-2e90-a38f-8d7b6fb526c4/05_catalog.png/1320x2868.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/75/62/52/756252cf-19fe-70df-6912-01a039a78e0b/06_history.png/1320x2868.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/32/bd/8d/32bd8d2a-f9c1-1041-277d-f6c0d7e998a0/07_night.png/1320x2868.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/76/7e/23/767e230c-4713-49c6-cdbd-542fa9e90915/09_pro.png/1320x2868.png)
- [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/48/06/3e/48063e6a-8146-aecc-bb3e-db1510e9e8c1/08_setup.png/1320x2868.png)
- [Screenshot 10](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/ec/e4/c0/ece4c040-0fd1-9030-668d-f748f9ddefe3/10_brand.png/1320x2868.png)



## Drilling Calculator for Rigs In-App Purchases
| Item | Price |
|------|-------|
| DERRICK Pro — Annual | $49.99 |
| DERRICK Pro — Monthly | $6.99 |

## Drilling Calculator for Rigs Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Canada | Utilities | #160 |


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## Drilling Calculator for Rigs Available In
- [Austria](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/austria)
- [Bulgaria](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/bulgaria)
- [Bahrain](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/bahrain)
- [Brazil](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/brazil)
- [Belarus](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/belarus)
- [Canada](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/canada)
- [Switzerland](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/switzerland)
- [China](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/china)
- [Colombia](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/colombia)
- [Cyprus](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/cyprus)
- [Czechia](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/czechia)
- [Germany](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/germany)
- [Dominican Republic](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/dominican-republic)
- [Spain](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/spain)
- [Finland](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/finland)
- [France](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/france)
- [Ghana](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/ghana)
- [Croatia](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/croatia)
- [Hungary](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/hungary)
- [Indonesia](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/indonesia)
- [Kenya](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/kenya)
- [Sri Lanka](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/sri-lanka)
- [Luxembourg](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/luxembourg)
- [Madagascar](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/madagascar)
- [Mali](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/mali)
- [Malta](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/malta)
- [Nigeria](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/nigeria)
- [Norway](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/norway)
- [Pakistan](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/pakistan)
- [Portugal](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/portugal)
- [Qatar](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/qatar)
- [Romania](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/romania)
- [Slovakia](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/slovakia)
- [Türkiye](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/turkey)
- [United States](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/united-states)
- [Vietnam](https://apptail.io/app/drilling-calculator-for-rigs-ftMA/vietnam)

---

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