TallyRig: Well Control Calc
Oilfield Calcs + Saved History
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Now in Portuguese & Spanish. 17 oilfield calculators — Kick Tolerance, Kill Sheet, Hydraulics, ECD & more. Unit changes now auto-convert. Guided setup. iPad-ready.
17 oilfield & drilling calculators — with a digital tally-book history.
TallyRig is a focused, field-ready calculator set for drilling and well control workflows. Run the essentials fast, save every result, and share a clean record when you need it.
DESIGNED FOR THE RIG
• Sunlight Mode: high-contrast screens you can read outside
• Glove-friendly: big targets, minimal tapping
• Offline-first: works without a signal
• Trust the math: review the formula / show-work for each result
17 FIELD CALCULATORS, ORGANIZED BY CATEGORY
• Well Control: Kill Sheet (Wait & Weight), Kick Tolerance, Gas Migration, Trip Fill, BOP Check (API Std. 53)
• Pressure: Hydrostatic, EMW from Pressure, ECD
• Fluids: Mud Weight-Up (barite), Slug, Cementing
• Tubulars: Pipe Tally, Buoyancy, Capacity, Stuck Pipe (Free Point)
• Hydraulics: Pump Output, Flow, Annular Velocity, Bottoms-Up
• Utilities: Oilfield Unit Converter
FIND TOOLS FAST
Search, category filters, and a drag-to-arrange dashboard so your most-used calculators are always on top.
HISTORY THAT'S ACTUALLY USEFUL
• Save any calculation to a clean history timeline
• Share a result card or a history record with your team
• Sync across devices via iCloud (when enabled)
UNITS
Switch between Imperial and Metric (SI) where supported.
Languages
- Full in-app translation in English, Português (Brasil) and Español — including every calculator, result view and formula label. Switch any time in Settings → Language.
WHO IT'S FOR
Drilling engineers, toolpushers, drillers, mud engineers, wellsite supervisors, and well control trainees who want a fast, reliable pocket reference.
IMPORTANT
TallyRig is a calculation aid for reference and cross-checking. Always verify inputs and outputs and follow your company procedures and training.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
TallyRig now speaks your language.
• Português (Brasil) and Español — the whole app, not just the menus. Switch any time in Settings → Language; new installs follow your device language.
• Guided first-run setup for new installs: your role, your rig's units and your most-used tools, configured in under a minute. Updating? Your existing settings and Pro unlock are untouched.
• Smarter units: changing a unit in Settings now converts your entered values instead of clearing them — the physical quantity is preserved.
• Made for iPad: layouts adapt to the bigger screen instead of stretching.
• Cementing formula display fixed in metric yield units, plus stability and polish.
Still 8 calculators free, forever.
The developer, 嘉炜 丰, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 嘉炜 丰
- Size
- 34.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- TallyRig Pro $14.99
- Copyright
- © 2026 Andy Feng