Voltage Unit Converter

Posted by Robbie Dickson on

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Voltage Unit Converter + Reference Table & Electronics Applications

It's common to see different voltage units in the same project—maybe you're wiring a 12V linear actuator, reading a few millivolts from a position sensor, and the sensor's datasheet lists microvolts. This converter sorts those units out right away. Put in any voltage, select the units, and you get all the relevant conversions at once. The reference scale and examples below strip out the confusion, and you'll find the nuts and bolts math and real-world context for actuators and sensors.

What Is Voltage Unit Conversion?

Voltage unit conversion is just shifting the same electrical potential between scales—microvolts (µV), millivolts (mV), volts (V), kilovolts (kV), and megavolts (MV). Each unit is a power-of-ten multiple of the volt. Nothing more complicated than moving the decimal point.

Simple Explanation

Voltage units are like measuring distance in meters, millimeters, or kilometers. The measurement stays the same—only the expression changes. For example, 12V is 12,000mV, which is 12,000,000µV. The absolute value doesn't change, just the unit label. This converter does that math instantly—think of it as a decimal point shifter.

Voltage Scale — Common Reference Points (Logarithmic) 1 µV Sensor noise 1 mV Thermocouple 100 mV Pressure sensor 12V Actuator 24V Actuator 120V Mains (US) 1 kV Industrial 1 MV Lightning ← Lower voltage Higher voltage → Value in target unit = Value × (source factor ÷ target factor) All factors are relative to 1 Volt

Voltage Unit Converter

Converted Values
Microvolts (µV)
—
Millivolts (mV)
—
Volts (V)
—
Kilovolts (kV)
—
Megavolts (MV)
—
Engineering calculation notice

This calculator is intended for education, concept evaluation, and preliminary design. Results are based on the equations and assumptions described on this page, but cannot account for every real-world load case, tolerance, material property, environmental condition, installation detail, safety factor, code, or regulatory requirement. Verify all inputs, assumptions, units, and results independently before selecting components or using the result in a real application. Safety-critical, structural, medical, lifting, transportation, or regulated applications must be reviewed by a qualified engineer.

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🎥 Video — Voltage Unit Converter

Voltage Unit Converter

How to Use This Calculator

The converter updates in real time—no "submit" needed. Here’s how you use it:

  1. Enter your voltage value in the box. 12 is the starting example since it’s one of the most common actuator voltages.
  2. Select the source unit to match your measurement or datasheet: µV, mV, V, kV, or MV.
  3. Check the results. All five conversions appear at once under the input.
  4. Adjust values as needed. Changing the number or unit recalculates immediately.
  5. Hit "Try Example" to reset back to 12V and see a typical conversion.

Voltage Unit Formula

The math is about as direct as it gets. Each voltage unit is a certain multiple of the volt. Moving between units is just multiplication.

General Conversion Formula:

Result = Input Value × (Source Factor ÷ Target Factor)
Equivalent Form (via Volts):

Value in Volts = Input Value × Source Factor
Result = Value in Volts ÷ Target Factor
Symbol Unit Name Factor (relative to 1 V)
µV Microvolt 0.000001 (10⁻⁶)
mV Millivolt 0.001 (10⁻³)
V Volt 1 (10⁰)
kV Kilovolt 1,000 (10³)
MV Megavolt 1,000,000 (10⁶)

Simple Example

Scenario: You have a 12V power supply for a FIRGELLI linear actuator and you need to know the equivalent in millivolts and microvolts — maybe you're comparing it against a sensor's full-scale output range.

Input: 12 V

Step 1 — Convert to base unit (Volts):
12 V × 1 = 12 V (already in volts)

Step 2 — Convert to millivolts:
12 V ÷ 0.001 = 12,000 mV

Step 3 — Convert to microvolts:
12 V ÷ 0.000001 = 12,000,000 µV

Step 4 — Convert to kilovolts:
12 V ÷ 1,000 = 0.012 kV

Practical meaning: Those 12 volts driving your actuator represent 12,000 millivolts. When a feedback sensor on that actuator outputs a signal in the 0–100 mV range, you can immediately see the scale difference — the supply voltage is 120× larger than the sensor's full-scale output. That's why signal conditioning and proper wiring matter.

Engineering Applications

Actuator Operating Voltages — 12V and 24V DC

12V and 24V DC are standard for FIRGELLI actuators because those voltages are practical for most power sources—automotive systems, solar, bench power supplies, or industrial 24V rails. Step one of actuator specification is getting the voltage right. If you mismatch, a 12V actuator on 24V will overheat and wear out fast, while a 24V actuator on 12V may stall or run too slow. Always check actual supply voltage; for example, car batteries supply 13.8V when fully charged, and 24V rails can sit at 27.6V. When setting up a controller or monitoring voltage in software, you’ll be dealing with millivolts—so 13,800 mV matters for your code and ADC thresholds.

Sensor Signals in the Millivolt Range

Most sensors output signals in millivolts. Think 0–100 mV for pressure sensors, a few tens of mV for strain gauges, or even microvolt output from thermocouples. For a Type K thermocouple, it’s about 41 µV/°C, so 200°C means 8.2 mV. These levels are well below actuator drive voltages, so you need amplification and careful wiring. If you're combining actuators (running at thousands of mV) with sensors (at millivolts), keep signal cables and power wires apart to avoid noise pickup. Shield sensor wires and keep their runs away from high-current actuator feeds.

Millivolt Precision in Position Feedback

Actuators with potentiometer feedback put out a voltage proportional to position—a small change in millivolts can indicate real movement. Say you’ve got a 100 mm actuator with a 0–3.3V feedback output; that’s 33 mV per millimeter. If your ADC resolves to about 3.2 mV per step (10 bits on 3.3V), that’s a 0.1 mm position change per count. You’ll need to filter out noise that’s below a few millivolts, otherwise those small voltage blips could cause false movement indication. Also, if your datasheet says ±0.5% linearity (full-scale), you can translate that to ±16.5 mV and judge if it fits your needs. Voltage conversion is the bridge between the large swings powering the actuator and the small signals telling you exactly where it is.

In the end, moving between µV, mV, and V is more than a math exercise—it’s what lets you set up systems where noisy motor wires and faint sensor traces have to work together without tripping over each other.

Advanced Example

Scenario: You're reading a feedback potentiometer on a 24V FIRGELLI actuator. The actuator's feedback circuit outputs 0.5V to 4.5V across its full 200 mm stroke. Your microcontroller's 12-bit ADC uses a 5V reference. You measure a raw ADC value of 2,048 counts and need to determine the actuator's position.

Step 1 — Convert ADC counts to volts:
Voltage = (2,048 ÷ 4,096) × 5V = 2.5V

Step 2 — Express in millivolts for precision analysis:
2.5V × (1 ÷ 0.001) = 2,500 mV

Step 3 — Calculate position from feedback range:
Feedback range: 4.5V − 0.5V = 4.0V = 4,000 mV
Current offset: 2,500 mV − 500 mV = 2,000 mV
Position = (2,000 mV ÷ 4,000 mV) × 200 mm = 100 mm (50% extended)

Step 4 — Determine position resolution:
ADC resolution: 5V ÷ 4,096 = 1.22 mV per count
Stroke sensitivity: 4,000 mV ÷ 200 mm = 20 mV/mm
Position resolution: 1.22 mV ÷ 20 mV/mm = 0.061 mm per count

Step 5 — Express ADC noise floor in microvolts:
±1 LSB noise = ±1.22 mV = ±1,220 µV
This corresponds to ±0.061 mm of position uncertainty.

Design interpretation: At 12-bit resolution, you're getting sub-0.1 mm position accuracy from a simple potentiometer feedback — more than enough for most automation tasks. But if electrical noise exceeds ±2–3 LSBs (roughly ±3,660 µV), your effective resolution degrades. That's your signal to add a simple moving-average filter in software or add a small ceramic capacitor across the feedback output.

Frequently Asked Questions

Why do FIRGELLI actuators use 12V or 24V instead of other voltages? +

These are the most widely available DC power sources. 12V matches automotive and marine batteries, small solar systems, and common bench supplies. 24V is the standard for industrial control systems and PLCs. Designing around these voltages means you won't struggle to find a compatible power supply for your project.

What's the difference between mV and µV — when does it actually matter? +

1 mV equals 1,000 µV. The distinction matters when you're working with very low-level signals — thermocouples, strain gauges, or high-precision feedback sensors. If your signal is in the microvolt range, you need instrumentation-grade amplifiers and shielded wiring. In the millivolt range, standard op-amps and careful layout are usually sufficient.

Can I run a 12V actuator on 24V or vice versa? +

No. Running a 12V actuator on 24V will double the voltage across the motor windings, causing excessive current draw, overheating, and likely permanent damage. Running a 24V actuator on 12V won't damage it, but you'll get significantly reduced speed and force — often not enough to be useful. Always match the supply to the actuator's rated voltage.

Does this converter handle AC voltages too? +

The unit conversion math is identical for AC and DC — a volt is a volt regardless of whether it's alternating or direct current. However, this converter doesn't account for RMS vs. peak vs. peak-to-peak distinctions in AC signals. If you're converting AC voltage measurements, make sure you know which type of reading you're starting with.

When would I ever need megavolts? +

Most DIY and industrial projects never touch megavolt territory. MV shows up in high-voltage power transmission, lightning research, and particle accelerators. We include it in the converter for completeness and because some electrical engineering coursework and reference materials use it. For actuator and sensor work, you'll live in the mV to V range.

My multimeter reads millivolts but my datasheet uses volts — is rounding safe? +

It depends on the context. For power supply voltages — say reading 12,050 mV and calling it 12V — rounding is perfectly fine. But for sensor signals where a few millivolts represent real measurement differences, you should keep the full precision. A good rule: if the millivolt digits affect your system's behavior or control decisions, don't round them away.

How do voltage drops in wiring affect these conversions? +

This converter changes units — it doesn't account for voltage drop, which is a separate calculation based on wire gauge, length, and current. If your 12V supply delivers only 11.2V at the actuator due to wiring losses, you should convert 11.2V (the actual voltage at the load), not 12V. Measure at the point of use for accurate results.

About the Author

Robbie Dickson — Chief Engineer & Founder, FIRGELLI Automations

Robbie Dickson brings over two decades of engineering expertise to FIRGELLI Automations. With a distinguished career at Rolls-Royce, BMW, and Ford, he has deep expertise in mechanical systems, actuator technology, and precision engineering.

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