MudMan is the offline-first field calculator built by a mud man, for mud men — not a general oilfield app, not built by an engineer who's never stood pit side. Every formula, every constant, every default is built around the fluid technician running the pits, tallying pills, and doing math with wet hands and no signal.

WHAT IT DOES
Enter your rig and well specs once. MudMan carries them through every calculation — pump output, strokes, volumes, pressures, weight-ups — so you're not re-keying the same numbers on every card. Six core calculators are free, no account needed:

Surface to Surface
Strokes to Bit
Bottoms Up
Annular Capacity
Pipe Capacity
Barite / CaCO3 / Hematite Weight-Up

MUDMAN PRO unlocks the rest: well profiles (Operator → Pad → Rig → Well), drilling update logs, BHA and bit tracking, tank farm volumes, the full calculator library with auto-prefill from your active well, calculation history, and the digital tally book with PDF export sized for standard sleeves.

OFFLINE-FIRST, ALWAYS
Every well profile, calculation, and tally card lives on your device. No signal required on location — MudMan works the same in the doghouse or three miles from the nearest tower.

TALLY BOOK, DIGITIZED
Reference cards for VIS cup flow rate, hydrostatic pressure, barite increase, alligation math, and more — live on your phone, or exported to PDF and printed to fit your existing tally book sleeves.

PRICING
Free — 6 core calculators, manual entry.
Try it for a hitch — 14-day full-access trial.
Monthly — $12.99, cancel anytime.
Annual — $99.99 (~$8.33/mo).

Built in the field, tested in the field. MudMan is in active development — beta feedback shapes what ships next.

M55

Additional Information