dBm to Watts Converter

Convert dBm to watts using the logarithmic formula P(W) = 10^((dBm-30)/10). RF / microwave converter with link-budget tips, ITU-R and IEEE references.

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watts to dbm

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How to convert dBm to watts?

To convert dBm to watts, apply the exponential formula P(W) = 10^((dBm − 30) / 10). dBm is a logarithmic unit referenced to 1 milliwatt, so the −30 shifts from milliwatts to watts. Every 10 dB step is a factor-of-10 change in power; every 3 dB is approximately doubling.

P_(W) = P_(dBm) × 1

Example

Convert 30 dBm to watts:

P_(W) = 1 dBm × 1 = 1 W

How do you convert dBm to watts?

Apply the formula P(W) = 10^((dBm − 30) / 10). The −30 converts from milliwatts back to watts, because dBm is referenced to 1 mW = 10^−3 W.

Why is 30 dBm equal to exactly 1 watt?

Because 30 dBm means 10^(30/10) = 10^3 = 1,000 milliwatts = 1 watt. The 30 dB offset is the logarithmic distance between 1 mW (the dBm reference) and 1 W.

dBm to Watts Converter — Convert dBm to watts using the logarithmic formula P(W) = 10^((dBm-30)/10). RF / microwave converter with link-budget ti — **dBm to Watts Converter**

What is dBm and who developed it?

dBm (decibel-milliwatt) is a logarithmic unit of absolute power referenced to 1 milliwatt. The decibel itself was developed by Bell Labs in the 1920s to express telephone-line transmission loss as additive numbers. dBm extends that to absolute power. The unit is now codified in IEEE Std 211 and ITU-R recommendations.

What are typical dBm levels in wireless systems?

Typical values: −100 dBm = cell-phone receive sensitivity (0.1 pW); −60 dBm = good Wi-Fi indoor signal (1 nW); 0 dBm = 1 mW reference; +20 dBm = consumer Wi-Fi TX (100 mW); +30 dBm = max FCC unlicensed (1 W); +46 dBm = LTE macro-cell TX (40 W); +60 dBm = 1 kW broadcast-band transmitter.

Why use dBm instead of plain watts?

Because RF link budgets involve many multiplicative gains and losses spanning 10+ orders of magnitude. In dB everything becomes addition: TX power + antenna gain − path loss + RX antenna gain = RX power, with no need to track 10^−12 or 10^9 scientific notation in your head.

Popular dBm to watts conversion table

dBm (dBm)	Watts (W)
−30 dBm	0.000001 W (1 μW)
−10 dBm	0.0001 W (100 μW)
0 dBm	0.001 W (1 mW)
10 dBm	0.01 W (10 mW)
20 dBm	0.1 W (100 mW)
23 dBm	≈0.1995 W
30 dBm	1 W
36 dBm	≈3.981 W
40 dBm	10 W
46 dBm	≈39.81 W
50 dBm	100 W
60 dBm	1000 W (1 kW)