Microwatts to Watts (µW to W) Converter

In ultra‑low‑power electronics and biomedical devices, power is often expressed in microwatts (µW). When scaling values into the SI base unit of power, watts (W) provide a clearer standard for reporting and comparison.

This guide explains how to convert microwatts to watts with formulas, tables, and examples.

Definitions of Microwatt and Watt

Let’s get started by understanding the key definitions of Microwatt (µW) and Watt (W). Understanding these terms will allow you to perform conversions confidently.

What is a Microwatt (µW)?

A microwatt (µW) is a unit of power in the International System of Units (SI) equal to one millionth (1/1,000,000) of a watt (0.000001 W).

$$\boxed{1 \,\text{µW} = 0.001 \,\text{mW}}$$

Microwatt is used to express extremely small power levels, often in microelectronics, biomedical devices, and ultra-efficient sensors.

Definition and Scale of Microwatt (µW) — Definition and scale of a microwatt (µW)

What is Watt?

Watt (W) is the SI derived unit of power, named after James Watt, the Scottish engineer who improved the steam engine. It measures the rate of energy transfer per unit time.^[1]

Mathematically 1 W = 1 j/s:

$$\boxed{1 \,\text{Watt} = 1 \,\frac{\text{Joule}}{\text{Second}}}$$

Where:

j = joule unit of energy
s = second unit of time

According to SI prefixes^[2], which are based on powers of 10, a watt (1 W) is equivalent to one million microwatts (1,000,000 µF).

$$\boxed{1 \,\text{W} = 1{,}000{,}000 \,\text{µW}}$$

Watts to Microwatts Conversion Scale — Watts to microwatts conversion scale

It is widely used to quantify electrical, mechanical, and thermal power in everyday applications such as light bulbs, appliances, and motors.

µW to W formula

Let’s take a closer look at the conversion formula so you can carry out these conversions independently, whether using a calculator or doing it manually with pencil and paper.

SI Prefixes and Values — SI multiples and submultiples

The micro- prefix in the International System of Units (SI) corresponds to a multiplier of 10^-6 (0.000001). To convert microwatts (µW) to watts (W), divide the power value in microwatts by 1,000,000.

P_(W) = P_(µW) ÷ 1,000,000

\text{P}_\text{(µW)} = \frac{\text{P}_\text{(µW)}}{1{,}000{,}000}

Or remember the µW-to-W conversion factor: 1 µW = 0.000001 W

µW to W conversion table

The conversion table below provides a handy reference for converting power measurement units from microwatts (µW) to watts (W). It covers commonly available power values, allowing for easy and quick conversions between these units of measurement.

Microwatts (µW)	Watts (W)
1 µW	0.000001 W
10 µW	0.00001 W
100 µW	0.0001 W
500 µW	0.0005 W
1,000 µW	0.001 W
2,000 µW	0.002 W
5,000 µW	0.005 W
10,000 µW	0.01 W
20,000 µW	0.02 W
50,000 µW	0.05 W
100,000 µW	0.1 W
200,000 µW	0.2 W
500,000 µW	0.5 W
800,000 µW	0.8 W
1,000,000 µW	1 W
2,000,000 µW	2 W
5,000,000 µW	5 W
10,000,000 µW	10 W
50,000,000 µW	50 W
100,000,000 µW	100 W

Microwatts (µW) to watts (W) conversion table

Examples

Now, let's look at an example that illustrates the calculations required to convert from microwatts to milliwatts (µW to mW).

Example: Wearable Health Monitor

A biomedical engineer is designing a wearable heart‑rate monitor that uses an ultra‑low‑power sensor. The sensor’s datasheet specifies its average power consumption as 750,000 µW. For reporting in SI base units, the engineer needs the value in watts.

Solution

Since 1 W = 1,000,000 µW, we can convert 750,000 µW to watts by using the following formula:

$$\text{P}_\text{(W)} = \frac{\text{P}_\text{(µW)}}{1{,}000{,}000}$$

$$\text{P}_\text{(W)} = \frac{750{,}000}{1{,}000{,}000} = \boxed{0.75 \,\text{W}}$$

Therefore, the sensor consumes 0.75 W of power.

To solve the problem with our calculator, follow the steps below:

Enter the value in microwatts: For this example, enter 750,000 into the From box.
View the result: The converter instantly calculates and displays the equivalent value in watts: 0.75 W.

Microwatts to watts (µW to W) conversion example — Steps to convert from microwatts to watts with our calculator

FAQs

Is 1 microwatt or 1 watt larger?

A watt (W) is a million times larger than a microwatt (µW). Here are the relationships between the units:

1 W = 10⁶ = 1,000,000 µW
1 µW = 10^-6 = 1 ÷ 1,000,000 = 0.000001 µW

How to convert from microwatts to watts?

To convert power from microwatts (µW) to watts (W), follow these simple steps:

Write down the power value in microwatts (µW).
Divide it by 1,000,000.
The result is the power in watts (W).

Why do I need to convert microwatts to watts?

Converting µW to W is essential when reporting ultra‑low‑power measurements in SI base units, or when comparing with standard power ratings.

You now know how to convert power units from microwatts (µW) to watts (W). You can quickly use our calculator to convert between the power measurement units to save time for future calculations.