Converting millivolts (mV) to volts (V) is essential in electronics, engineering, instrumentation, and laboratories. Accurate conversion ensures system compatibility, measurement precision, safety, and supports calculations, tables, formulas, and practical applications.

Millivolts to Volts Calculator

Millivolts (mV): Decimals:

How this calculator works

This calculator converts millivolts (mV) to volts (V) by dividing by 1000. Formula: V = mV ÷ 1000.

Common Millivolt to Volt Conversions

For engineers and technicians, having a reference table for millivolt-to-volt conversions saves time and reduces errors. The conversion factor is:

Below is an extensive table with commonly used millivolt values and their corresponding volt equivalents:

Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)
1	0.001	100	0.1	1000	1
2	0.002	150	0.15	1500	1.5
5	0.005	200	0.2	2000	2
10	0.01	250	0.25	2500	2.5
20	0.02	300	0.3	3000	3
50	0.05	400	0.4	4000	4
75	0.075	500	0.5	5000	5
100	0.1	600	0.6	6000	6
125	0.125	700	0.7	7000	7
150	0.15	800	0.8	8000	8
200	0.2	900	0.9	9000	9
250	0.25	950	0.95	10000	10

Tip for Engineers: Always round voltages to appropriate decimal places depending on measurement precision. For microvolt-level circuits, conversions require greater decimal accuracy.

Formulas for Millivolts to Volts Calculations

The millivolt-to-volt conversion is straightforward but often forms the basis for more complex electrical calculations. The main formulas include:

1. Basic Conversion Formula

V = Voltage in volts
mV = Voltage in millivolts

Explanation: Since 1 volt equals 1000 millivolts, dividing by 1000 converts mV to V.

Example Values:

500 mV → 500/1000=0.5 V
2500 mV → 2500/1000=2.5 V

2. Reverse Conversion Formula

mV = Voltage in millivolts
V = Voltage in volts

Explanation: Multiply volts by 1000 to convert to millivolts. This is essential when specifying sensor outputs or instrumentation signals.

Example Values:

3.3 V → 3.3×1000=3300 mV
0.75 V → 0.75×1000=750 mV

3. Voltage Drop Across a Resistor

When working with circuits, the millivolt-to-volt conversion is often used alongside Ohm’s law:

V = Voltage in volts (or convert mV to V)
I = Current in amperes
R = Resistance in ohms

Example: A sensor generates 500 mV across a 100 Ω resistor.
Convert millivolts to volts: 500/1000=0.5 V
Then calculate current: I=V/R=0.5/100=0.005 A

Real-World Applications of Millivolt to Volt Conversion

Millivolt-to-volt calculations are critical in electronics, instrumentation, industrial control, and laboratory settings. Below are two detailed case studies.

Case Study 1: Temperature Sensor in Industrial Automation

A thermocouple produces a voltage output proportional to temperature in millivolts. Suppose a type K thermocouple outputs 25 mV at 250°C. To interface with a data acquisition system:

Convert millivolts to volts:

Input voltage to ADC (Analog-to-Digital Converter) with 0–5 V range.
ADC output can then be scaled to represent temperature accurately.

Key Insight: Accurate millivolt-to-volt conversion ensures precise temperature readings in automated systems.

Case Study 2: Low-Voltage Signal Amplification

A biomedical sensor detects ECG signals generating 1.2 mV. To display or record signals:

Convert millivolts to volts for amplification circuits:

Feed into an operational amplifier with a gain of 1000:

The amplified signal can now be processed by digital instruments.

Key Insight: Millivolt-to-volt conversion is essential for signal conditioning in sensitive measurement systems.

Extensive Millivolts to Volts Conversion Tables

Table 1: Small Values (1–100 mV)

Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)
1	0.001	34	0.034	67	0.067
2	0.002	35	0.035	68	0.068
3	0.003	36	0.036	69	0.069
4	0.004	37	0.037	70	0.070
5	0.005	38	0.038	75	0.075
6	0.006	40	0.040	80	0.080
10	0.010	45	0.045	90	0.090
15	0.015	50	0.050	95	0.095
20	0.020	55	0.055	100	0.100

Table 2: Medium Values (101–1000 mV)

Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)
150	0.150	300	0.300	450	0.450
200	0.200	350	0.350	500	0.500
250	0.250	400	0.400	550	0.550
275	0.275	425	0.425	600	0.600
300	0.300	450	0.450	650	0.650
325	0.325	475	0.475	700	0.700
350	0.350	500	0.500	750	0.750
375	0.375	525	0.525	800	0.800
400	0.400	550	0.550	900	0.900
450	0.450	600	0.600	950	0.950

Table 3: Large Values (1001–5000 mV)

Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)	Millivolts (mV)	Volts (V)
1000	1.000	2000	2.000	3000	3.000
1100	1.100	2100	2.100	3100	3.100
1200	1.200	2200	2.200	3200	3.200
1300	1.300	2300	2.300	3300	3.300
1400	1.400	2400	2.400	3400	3.400
1500	1.500	2500	2.500	3500	3.500
1600	1.600	2600	2.600	3600	3.600
1700	1.700	2700	2.700	3700	3.700
1800	1.800	2800	2.800	3800	3.800
1900	1.900	2900	2.900	3900	3.900
2000	2.000	3000	3.000	4000	4.000
2500	2.500	3500	3.500	4500	4.500
3000	3.000	4000	4.000	5000	5.000

These tables cover almost all commonly used values in electronics, sensors, and industrial instrumentation.

Frequently Asked Questions

Q1: Why do engineers often convert millivolts to volts?
Millivolts are very small units, often used in sensors and precision electronics. Converting to volts makes data easier to interpret and compatible with standard instruments.

Q2: What are typical applications of millivolt-to-volt conversion?
Applications include thermocouples, strain gauges, ECG sensors, and other low-voltage signals in industrial or medical devices.

Q3: How precise should a millivolt-to-volt conversion be?
Precision depends on the application. Laboratory instruments may require 3–6 decimal places, while industrial controls usually need 2–3.

Q4: Can I display millivolt measurements directly?
Yes, but many systems (data loggers, ADCs, PLCs) prefer voltage in volts for scaling and standardization.

Q5: How does temperature affect millivolt readings?
Temperature variations can cause slight voltage offsets, especially in thermocouples or low-voltage sensors. Calibration is essential.