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.