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dBm to Watts Calculator

Choose the values, enter the power in dBm, and the tool will instantly calculate the relative watt values

Conversion Type:

Power

dBm

Related

This dBm to watts calculator converts power measurements between decibel-milliwatts (dBm), watts (W), and milliwatts (mW). It allows quick and accurate conversion for electrical signals and power levels.

What is dBm?

dBm stands for decibels relative to one milliwatt and is a unit of power. It is commonly used to describe the strength of an electrical signal, such as from an antenna or amplifier. Using a dBm to watts calculator, you can easily convert dBm values to watts (W) or milliwatts (mW).

How to Convert dBm to Watts?

The formula to convert dBm to watts is:

P(W) = 1 W ⋅ 10^((P(dBm) – 30) / 10)

Where:

P(W) = Power in watts
P(dBm) = Power in decibels-milliwatt (dBm)

This calculator also works in reverse, converting watts back to dBm.

How to Convert dBm to Milliwatts (mW)?

Use the formula:

P(mW) = 1 mW ⋅ 10^(P(dBm)/10)

Where:

P(mW) = Power in milliwatts
P(dBm) = Power in decibels-milliwatt

How to Convert Watts to dBm?

The formula for converting watts to dBm is:

P(dBm) = 10 ⋅ log₁₀(P(W)/1 W) + 30

Where:

P(dBm) = Power in dBm
P(W) = Power in watts

How to Convert Milliwatts (mW) to dBm?

Use the formula:

P(dBm) = 10 ⋅ log₁₀(P(mW)/1 mW)

Where:

P(dBm) = Power in dBm
P(mW) = Power in milliwatts

Practical Example:

Suppose a signal has a power of 30 dBm. What is the equivalent in watts?

Solution:

Using the dBm to watts formula:

P(W) = 1 W ⋅ 10^((30 – 30)/10) = 1 W

To convert watts to milliwatts, multiply by 1000:

P(mW) = 1000 mW

dBm to Watt Conversion Table:

The table below shows common conversions between dBm, watts, and milliwatts.

Power (dBm)	Power (dBW)	Power (W)	Power (mW)
-100 dBm	-130 dBW	0.1 pW	0.0000000001 mW
-90 dBm	-120 dBW	1 pW	0.000000001 mW
-80 dBm	-110 dBW	10 pW	0.00000001 mW
-70 dBm	-100 dBW	100 pW	0.0000001 mW
-60 dBm	-90 dBW	1 nW	0.000001 mW
-50 dBm	-80 dBW	10 nW	0.00001 mW
-40 dBm	-70 dBW	100 nW	0.0001 mW
-30 dBm	-60 dBW	1 µW	0.001 mW
-20 dBm	-50 dBW	10 µW	0.01 mW
-10 dBm	-40 dBW	100 µW	0.1 mW
0 dBm	-30 dBW	1 mW	1 mW
10 dBm	-20 dBW	10 mW	10 mW
20 dBm	-10 dBW	100 mW	100 mW
30 dBm	0 dBW	1 W	1000 mW
40 dBm	10 dBW	10 W	10000 mW
50 dBm	20 dBW	100 W	100000 mW
60 dBm	30 dBW	1 kW	1000000 mW
70 dBm	40 dBW	10 kW	10000000 mW
80 dBm	50 dBW	100 kW	100000000 mW
90 dBm	60 dBW	1 MW	1000000000 mW
100 dBm	70 dBW	10 MW	10000000000 mW