Industrial Instrumentation Tool · 2026

4–20mA Signal Scaling Calculator

Convert mA readings to engineering units, generate calibration tables, check ADC counts, verify loop power budget and HART compliance.

EU = (mA − 4) ÷ 16 × (Max − Min) + Min

↔

mA = (EU − Min) ÷ (Max − Min) × 16 + 4

↔

% = (mA − 4) ÷ 16 × 100

Transmitter Range

Quick presets

Range Minimum (0% / 4mA)

Range Maximum (100% / 20mA)

Engineering Unit

ADC Resolution

Signal Input

12.00 mA

0 mA4 mA12 mA20 mA24 mA

or type exact mA value

Results

Engineering Value

—

Configure range and click Convert

Signal (mA)

—

Percentage

—%

Live-zero principle: 4mA = 0%, 20mA = 100%. 0mA or <3.6mA typically indicates broken wire / power loss.
Loop calculations at 20mA (worst-case). HART requires minimum 230Ω total loop resistance.
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