🔌

My LoopCal

Convert, verify, and document 4–20 mA instrument loops in seconds — direct or reverse, linear or square root — completely offline.

Download on the App Store

Built for instrumentation and calibration technicians

Convert instantly: 4–20 mA, 0–20 mA, 0–10 V, 1–5 V, and custom endpoints — percent, signal, and engineering values update as you type, with the substituted formula shown.
Direct and reverse acting, linear and square-root (flow) transfer functions, and engineering ranges with any unit, including negative and offset spans.
Verify and document: three-point, five-point, and custom 2–21-point checks, as-found and as-left runs, immediate error and pass/fail, worst-point and maximum-error summaries.
Tolerance on your basis: percent of span, signal units, or engineering units.
Loop power math: shunt resistor voltage drop, required supply voltage and remaining compliance, maximum loop and wire resistance.
Organize and share: saved instruments, ranges, and history, due-date reminders, and PDF and CSV field worksheets carrying your company identity.
Private by design: everything runs on your device. No account, no ads, no tracking, no network.

LoopCal is a calculation aid and field worksheet — not a calibrator, an accredited calibration service, or a replacement for manufacturer procedures. Always follow site lockout/tagout, operations authorization, device manuals, and approved procedures.