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4-20mA Current Loop Calculator

Loop voltage budget for a 2-wire loop-powered transmitter: wire voltage drop at 20mA, voltage available at the transmitter, and maximum cable length before the transmitter starves.

AAJappsEngineering Calculation Report

4-20mA Current Loop Calculator

Ohm's law loop voltage budget

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

Power supply & transmitter

V
V

Loop resistances

Ω
Ω

Cable

ft

Loop voltage budget

Round-trip wire resistance32.28 Ω
Total loop resistance282.28 Ω
Voltage drop in wiring (at 20mA)0.646 V
Voltage available at transmitter18.35 V
Headroom vs. transmitter minimum6.35 V ✓

Maximum reach

Max loop resistance budget600.0 Ω
Max one-way cable length10843 ft