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Reading: Formula for Current 4-20ma to Percentage Conversion
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Inst Tools > Blog > Formulas > Formula for Current 4-20ma to Percentage Conversion

Formula for Current 4-20ma to Percentage Conversion

Last updated: March 27, 2023 9:52 am
Editorial Staff
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Calculate the equivalent Percentage for any given current signal 4 to 20 mA. For conversion, we need transmitter’s Lower Range Value and Upper Range Value.

Contents
Current 4-20ma to Percentage ConversionPercentage, %  =   ((X-4)/16)(100)Video Lesson

Current 4-20ma to Percentage Conversion

Formula for Current 4-20 mA to Percentage Conversion

 Formula:

Percentage, %  =   ((X-4)/16)(100)

Where

X is current signal in mA

Video Lesson

4-20 mA into 0-100 % Calculation Formula - Instrumentation Tutorials

Example: 

An electronic Pressure transmitter is ranged -1 to 5 Bar and has a 4-20 ma. Calculate the Percentage output by this transmitter if the measured output current is 13ma.

Percentage %  = ((X-4)/16)(100)

Percentage %  = ((13-4)/16)(100)

Percentage %  = 56.25

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6 Comments
  • kedar says:
    August 7, 2016 at 1:49 am

    Very good post

    Reply
  • Mohamed Razick says:
    April 16, 2018 at 2:16 pm

    Really Helpfull…!

    Reply
  • Akthar Husssain says:
    January 21, 2020 at 8:29 pm

    endless knowledge …………………………..about Instrumentation

    Reply
  • Vince says:
    December 9, 2023 at 7:13 am

    Thank you so much, this finally makes sense to me.

    Reply
  • Gary Taylor says:
    March 27, 2024 at 1:45 pm

    The -25 part was very unclear – I understand the value doesn’t start at 0 but you just came up with -25 from 4-20?!

    Reply
  • Nagendra says:
    April 13, 2025 at 1:33 pm

    its really helpful for instrumentation guys

    Reply

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