TallyRig: Well Control Calc

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.