Beta
Android · Coming Soon
The Digital Tally Book

Every calculation.
One app.
No signal required.

Mud Man replaces the paper tally book with an offline-first field calculator built by a fluid tech who got tired of doing math in the mud. Enter your rig specs once — every calculation updates automatically.

Offline First
Android
24+ Calculators
Rig-Aware

The Old Way

Paper tally books that get soaked in mud
Re-entering rig specs into every calculator
Separate apps for pump output, annular volume, bottoms up
No signal at the rig site means no cloud apps
Scratching formulas on a whiteboard

The Mud Man Way

✓ Everything on your phone, rain or shine
✓ Enter rig specs once, used everywhere
✓ All calculations in one app, derivations chain automatically
✓ Works with zero connectivity — built for dead zones
✓ Live results pinned to your home screen
Built-In Calculators
24+
Field calculations that chain together automatically
Pump Output
bbl/stroke from liner + efficiency
Annular Velocity
ft/min per section
Bottoms Up
strokes and time from bit
Total Circulation
full system volume
Annular Volume
multi-section cased + open hole
Pipe Capacity
drill pipe + BHA volumes
Weight Up / Down
barite and dilution calcs
Kill Sheet
ICP, FCP, pressure schedule
Alligation
mixing ratios and parts
Cuttings
volume and retention factor
Vis Cup Flow Rate
Marsh funnel bbl/hr
+ 13 More
and growing

Enter it once. Used everywhere.

Mud Man follows the DRY principle — Don't Repeat Yourself. Your rig specs, interval geometry, and SPM flow into every calculation automatically. Change your bit depth and watch bottoms up, circulation time, and annular volumes update in real time.

Operator → Rig → Well → Interval. One data hierarchy. Every calculation reads from it. No re-entering numbers you already typed.

The field tool you wish you'd had ten years ago.

Coming to Android

Mud Man is in active development and field testing. Sign up to get notified when the beta drops.

Join the Beta List
Built by a mudman, for mudmen. No suits involved.