Tools / dbm-to-watts-calculator

dBm to Watts Conversion Calculator

Convert dBm, Watts, and milliwatts (mW) instantly using the calculator below. This tool is widely used in RF engineering, wireless communication, antenna design, and telecom networks to convert between logarithmic and linear power units.

Result

Enter a value and convert.

dBm to Watts Formula

• P(W) = 10^((P(dBm) - 30) / 10)
• P(mW) = 10^(P(dBm) / 10)
• P(dBm) = 10 * log10(P(mW)) = 10 * log10(P(W) * 1000)

Common reference points: 0 dBm = 1 mW, 10 dBm = 10 mW, 20 dBm = 100 mW, and 30 dBm = 1 W.

dBm to Watts Conversion

What is dBm?

dBm (decibel-milliwatts) is a logarithmic unit used to express power relative to 1 milliwatt.

It is extremely common in:

• Wireless networks
• RF engineering
• Cellular networks (4G / 5G)
• WiFi signal strength
• Antenna systems

Because RF power levels vary widely, engineers use logarithmic units like dBm instead of watts.

Example

dBm to Watt Formula

To convert dBm to Watts, use:

P(W) = 10^((P(dBm) - 30) / 10)

Where:

• P(W) = Power in Watts
• P(dBm) = Power in dBm

Watt to dBm Formula

To convert Watts to dBm, use:

P(dBm) = 10 * log10(P(W) * 1000)

Where:

• P(W) = Power in Watts
• P(dBm) = Power in dBm

Common dBm to Watt Conversion Table