---
title: How to Convert mA to Voltage
description: How to Convert Voltage. Learn how to convert  Volts to amps, mA to Voltage,and mA to amps.
---

[Setra Blog ](https://www.setra.com/blog)

# [How to Convert mA to Voltage](https://www.setra.com/blog/how-to-convert-ma-to-voltage/2012/12/19)

 Written by [Tom Lish](https://www.setra.com/blog/author/tom-lish) | December 14, 2021

****

Converting mA to voltage is common in HVAC when working with pressure transducers. Terminology to keep in mind includes:

- 1 mA = 0.001 AMP (short for amperes)
- Amps are referred to as **CURRENT**
- Resistor values are in **OHMS** (Ω is the symbol for ohms)
- **VOLTAGE** is the result of passing amps through a resistor

 

 In order to change mA (current) to voltage, you need to pass the current through a resistor.

The formula for voltage is:

##### E = IR

##### E stands for volts, I stands for amps, and R stands for resistance

 

In control circuits, the most common resistor values are 250Ω & 500Ω, although any value can be used depending upon the device.

| If your control circuit is using a 250Ω resistor: |  |  |
| --- | --- | --- |
| **mA** | **Amps x Resistance** | **Volts** |
| 4 | 0.004 x 250Ω | 1 |
| 5 | 0.005 x 250Ω | 1.25 |
| 6 | 0.006 x 250Ω | 1.5 |
| 7 | 0.007 x 250Ω | 1.75 |
| 8 | 0.008 x 250Ω | 2.0 |
| 9 | 0.009 x 250Ω | 2.25 |
| 10 | 0.010 x 250Ω | 2.5 |
| 11 | 0.011 x 250Ω | 2.75 |
| 12 | 0.012 x 250Ω | 3.0 |
| 13 | 0.013 x 250Ω | 3.25 |
| 14 | 0.014 x 250Ω | 3.5 |
| 15 | 0.015 x 250Ω | 3.75 |
| 16 | 0.016 x 250Ω | 4 |
| 17 | 0.017 x 250Ω | 4.25 |
| 18 | 0.018 X 250Ω | 4.5 |
| 19 | 0.019 x 250Ω | 4.75 |
| 20 | 0.020 x 250Ω | 5 |

| If your control circuit is using a 500Ω resistor: |  |  |
| --- | --- | --- |
| **mA** | **Amps x Resistance** | **Volts** |
| 4 | 0.004 x 500Ω | 2 |
| 5 | 0.005 x 500Ω | 2.5 |
| 6 | 0.006 x 500Ω | 3 |
| 7 | 0.007 x 500Ω | 3.5 |
| 8 | 0.008 x 500Ω | 4 |
| 9 | 0.009 x 500Ω | 4.5 |
| 10 | 0.010 x 500Ω | 5 |
| 11 | 0.011 x 500Ω | 5.5 |
| 12 | 0.012 x 500Ω | 6 |
| 13 | 0.013 x 500Ω | 6.5 |
| 14 | 0.014 x 500Ω | 7 |
| 15 | 0.015 x 500Ω | 7.5 |
| 16 | 0.016 x 500Ω | 8 |
| 17 | 0.017 x 500Ω | 8.5 |
| 18 | 0.018 x 500Ω | 9 |
| 19 | 0.019 X 500Ω | 9.5 |
| 20 | 0.020 x 500Ω | 10 |

 

 

 

 

 

[View full post](https://www.setra.com/blog/how-to-convert-ma-to-voltage/2012/12/19)

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