Run the numbers. Generate the code.
Calculators and sample PLC code, so technicians work faster with fewer errors.
FreePro
Free includes the handbook and every tool marked free. Pro opens the rest.
Calculators and sample PLC code, so technicians work faster with fewer errors.
Free includes the handbook and every tool marked free. Pro opens the rest.
A short walkthrough of the field calculators, the handbook, and working offline.
A printable overview of MileThree I&E for technicians and the people who roll a crew onto one toolkit. It names the free and Pro tools, the enterprise seat license, and how to reach help.
Download the PDFThe next loop check can start from a phone, with a free account, even when the pad has no signal.
Faster calculations in the field
Enter the reading you already have. The tool returns the number for that check.
Works offline on a phone
After a signed-in visit, saved calculators keep running when the network drops.
No formula hunting
Each tool shows the math it used, so the factor stays with the job instead of in a truck binder.
Saved site procedures
Write a startup, shutdown, or isolation checklist and share a read-only copy with the crew.
A free account in a minute
Sign up and the free tools, the handbook, and site procedures open.
4–20 mA analog scaling
Scale a process value to loop current, including linear and square-root transfer.
Hydrostatic Pressure & Kill Mud Weight
Hydrostatic pressure and unmargined kill-mud weight from density, TVD, and SIDPP.
Voltage and signal scaling
Scale a process value to 4–20 mA, 0–10 V, or 1–5 V, linear or square-root.
DP wet-leg / dry-leg level
Hydrostatic level LRV and URV for wet-leg or dry-leg differential pressure.
MileThree I&E is an offline-ready field toolkit for instrumentation and electrical technicians. It gathers standards-based calculators, a public PLC handbook, and site procedures in one branded app.
The PLC handbook is a public pocket guide. It opens with no account.
A signed-in person can write site procedures and share a read-only copy with someone in the same organization, or with someone who is also outside an organization.
After a signed-in visit, saved calculators keep running when the plant network drops. Free calculators do not expire. A Pro module stays behind a signed, device-bound pass that the device refreshes on the next check-in.
Each calculator is a clean-room implementation of a public standard, including ISA practice, NAMUR NE43, IEC 60751, NIST ITS-90, the Modbus serial-line specification, IEEE 754, and the NEC / ISA entity method.
The public catalog lists 6 free tools and 36 Pro tools. A free account opens the free set. Pro opens the rest.
Titles and short descriptions from the public catalog. A locked card shows the same text.
4–20 mA analog scaling
Scale a process value to loop current, including linear and square-root transfer.
Voltage and signal scaling
Scale a process value to 4–20 mA, 0–10 V, or 1–5 V, linear or square-root.
Chemical Pump Sight Glass Calibration
Sight-glass drawdown for a target pump rate, or the rate implied by an observed drop.
Hydrostatic Pressure & Kill Mud Weight
Hydrostatic pressure and unmargined kill-mud weight from density, TVD, and SIDPP.
Pipe & Annular Capacity
Tubing bore and casing-annulus fluid volume from the oilfield capacity factor.
Vertical Tank Volume
Ideal vertical-cylinder volume from a gauge reading, in barrels and gallons.
Pro tools appear here by name. Opening one requires a Pro session or an enterprise seat.
Loop check-out
Expected 4–20 mA, 1–5 V, or 0–10 V at each test percent, with a tolerance band.
PID loop tuning
Ziegler–Nichols and Cohen–Coon settings from an ultimate-gain test or a reaction curve.
Transmitter linearity
Five-point calibration error and terminal-based linearity as a percent of span.
Capillary seal drift
Fill-fluid density shift and the resulting zero error on a differential-pressure seal.
Control valve Cv
Liquid and gas Cv with a choked-flow flag.
DP flow
Volumetric and mass flow from differential pressure for an orifice, venturi, or pitot.
DP wet-leg / dry-leg level
Hydrostatic level LRV and URV for wet-leg or dry-leg differential pressure.
Flow totalizer
Rate and total from a pulse K-factor, plus the linear current that rate would drive.
Orifice plate sizing
Bore and beta ratio for a given flow and differential pressure.
Tank level from pressure
Liquid height from gauge pressure, specific gravity, blanket pressure, and the height of the tap.
RTD Pt100 / Pt1000
Callendar–Van Dusen resistance and temperature for IEC 60751 RTDs.
RTD tolerance class
IEC 60751 class A and B tolerance, plus 2-wire, 3-wire, and 4-wire lead error.
Thermocouple Type J / K
Type J and K millivolts and temperature with cold-junction compensation.
Thermocouple types
NIST ITS-90 millivolts for types J, K, T, E, N, R, S, and B, with a cold junction.
Thermowell wake frequency
Strouhal wake frequency against a cantilever natural frequency, using the ASME PTC 19.3 TW 0.8 and 0.4 screens.
Modbus register decode
Decode one register as 16-bit, or two registers as an IEEE 754 float, with word and byte swap.
Modbus RTU CRC and float order
CRC-16 for an RTU frame, and IEEE 754 float byte-order decode.
Modbus RTU frame builder
Build an RTU request for function codes 01 through 06, 15, and 16, and append the CRC.
Conductor ampacity
Ampacity by size, metal, temperature column, ambient, and conductor count.
Conductor voltage drop
DC or three-phase AC voltage drop compared with NEC branch and feeder guidance.
Conduit fill
Raceway fill from conductor count, insulation, and trade size.
Hazardous-area classification
Class, Division, Zone, Group, and temperature-code reference for NEC Articles 500 and 505. Verify with the AHJ.
IS entity parameter check
Compare barrier entity parameters with the field device and cable.
Loop load and HART resistance
Maximum loop resistance from the supply, and the HART resistance window.
Conveyor Indexing PLC Tester
Indexing conveyor test bench with live ladder, generated PLC code, and safety wiring.
Mud/Frac Pit Volume
Ideal rectangular mud pit, frac tank, or berm volume in barrels from length, width, and fluid depth.
Pipe Metal Displacement
Open-end steel displacement and closed-end displacement for plain tubing or drill pipe.
Equivalent Circulating Density (ECD)
Circulating density from static mud weight, true vertical depth, and annular pressure loss.
Instrument tubing design pressure
Straight-tube internal design pressure from wall, mill tolerance, and allowable stress.
Fluid Cut / Brine Blending
Ideal mix of two known fluids, or the second volume that cuts the first to a target density.
Mud Weight-Up (Sacks of Barite)
Sacks of barite to raise a starting pit from the current mud weight to a target weight.
Pump Strokes & Displacement Time
Strokes and minutes to move a known volume at a stated pump output and speed.
API Gravity ↔ SG ↔ PPG
Convert API gravity, specific gravity, and oilfield density at 60°F. No volume correction factor.
Pipe Tally Tape & Volume Converter
Decimal feet and tally hundredths from feet, inches, and eighths, plus a barrel conversion.
Oilfield Constants
Field sheet for 1029.4, 0.052, 5.615, 0.1399, 0.6572, and 8.33, with the exact value and where each number comes from.
Unit conversions
Convert pressure, temperature, flow, length, and volume with NIST SP 811 factors.
Cited in the MileThree I&E Production Design Document v2, October 2026.
Deloitte reports that tenured crew make up about 50% of oil, gas, and chemicals personnel, and that most of that group will retire within 5–7 years. A shared toolkit gives a new technician the same formulas the crew already uses.
Deloitte, The Future of Work in Oil, Gas and ChemicalsThe IEA World Energy Employment 2025 report found that more than half of 700+ surveyed energy firms report critical hiring bottlenecks, most acute in applied technical roles, and estimates about 40% more new entrants are needed by 2030.
IEA, World Energy Employment 2025, executive summaryMcKinsey notes that about 30% of global onshore production is connected by VSAT, and that links such as those in the Permian are bandwidth-limited. The app is built to keep working when that link drops.
McKinsey, How tapping connectivity in oil and gas can fuel higher performance (2020)Field audits summarized by Raymond Panko found errors in 94% of 88 operational spreadsheets in one review and in 84% of 163 in another. The calculators show a cited public formula with the technician's own numbers.
Raymond R. Panko, spreadsheet audit summaryThe U.S. Chemical Safety Board found that the BP Texas City raffinate-splitter level transmitter gave misleading readings, partly because it was calibrated for a different specific gravity. The DP level and tank tools take specific gravity as an explicit input.
U.S. Chemical Safety Board, BP Texas City final reportQA pass recorded October 15, 2026. That pass recorded 683 unit tests and 92 browser tests, as cited in the MileThree I&E Production Design Document v2.
Match the work in front of the crew, then add the next piece when that work shows up. The free tools and the handbook stand on their own. Pro seats, site procedures, and the organization console follow.
A new loop has to read the right signal before it is left in service.
Toolkit. A free account opens analog scaling and voltage and signal scaling. A Pro seat adds loop checkout.
A level, a loop, or a serial reading does not match the panel.
Toolkit. Differential-pressure level, loop load, and Modbus CRC are Pro tools for that call.
A technician needs the pocket reference before an account exists.
PLC handbook. It is public. Calculators follow cited standards, including ISA practice, NAMUR NE43, IEC 60751, NIST ITS-90, Modbus, IEEE 754, and the NEC / ISA entity method.
Startup, shutdown, and isolation steps should read the same for every technician on the site.
Site procedures. A signed-in person writes the checklist and shares a read-only copy.
The location has no useful signal.
Toolkit on a phone. Saved calculators keep running. Free calculators stay available. A Pro module uses a signed device pass that refreshes on the next check-in.
One company wants Pro tools for a set of seats, its own colors, and a person who can invite the crew.
Enterprise seats and the organization console. Johnson Automation Group, Three Mile Creek Services, and Creekbound Services present the toolkit. Reach them through the help site.
Calculations are aids for trained technicians. They are not a substitute for stamped engineering, manufacturer documentation, site procedures or applicable codes (NEC/ISA). Always verify results.
A free account opens the free tools, the handbook, and site procedures. Docs, help, and status stay public.