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SESK: Stuff Everyone Should Know · sesk.info/ham-500-milliwatts-half-watt

Which is equal to 500 milliwatts?

0.5 watts.

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  1. 5 watts
  2. 500,000 watts
  3. 0.5 watts ✔

Why: Milli means one thousandth. Five hundred milliwatts is 500 divided by 1,000, or 0.5 watt.

Huh, didn't know that: A 1-watt signal is twice the power of a 500-milliwatt signal.

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Why did the tiny transmitter feel left out? Everyone said it was only half-watt it could be.
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References

Answer: 0.5 watts. Milli means one thousandth. Five hundred milliwatts is 500 divided by 1,000, or 0.5 watt.

  1. HamStudy 2026 Technician pool, T5B05 hamstudy.org/browse/E2_2026/T5B
    Therefore 500 milliwatts = 500 / 1000 = 0.5 watts.
    Checked 2026-10-09.

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