How to use
- Fill in Conversion, Value for Decibelpower.
- To match “A power ratio of 100”, enter Conversion ratio-to-db; Value 100.
- Press Convert. The summary line should be “Decibelpower: 20 dB”.
- Read every line under “Decibelpower: 20 dB” before you copy the Decibelpower result.
- Press Copy for the whole Decibelpower result, or Reset to restore “A power ratio of 100”.
- For the second check, “20 dBm into milliwatts”, the summary should be “Decibelpower: 100 milliwatt”.
Formula / how it works
Example “A power ratio of 100” sets Conversion = ratio-to-db; Value = 100.
Decibelpower returns this exact text:
Decibelpower: 20 dB
10 × log10(100) for a power ratio.
Power decibels use 10 log10, not 20.
Example “20 dBm into milliwatts” sets Conversion = dbm-to-mw; Value = 20.
Decibelpower returns this exact text:
Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
0 dBm is defined as 1 milliwatt.
Decibelpower vocabulary for this page: decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 1 (“20 dBm into milliwatts”) prints:
Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 2 (“A power ratio of 100”) prints:
Decibelpower: 20 dB
10 × log10(100) for a power ratio.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 3 (“20 dBm into milliwatts”) prints:
Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 4 (“A power ratio of 100”) prints:
Decibelpower: 20 dB
10 × log10(100) for a power ratio.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 5 (“20 dBm into milliwatts”) prints:
Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 6 (“A power ratio of 100”) prints:
Decibelpower: 20 dB
10 × log10(100) for a power ratio.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 7 (“20 dBm into milliwatts”) prints:
Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 8 (“A power ratio of 100”) prints:
Decibelpower: 20 dB
10 × log10(100) for a power ratio.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 9 (“20 dBm into milliwatts”) prints:
Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 10 (“A power ratio of 100”) prints:
Decibelpower: 20 dB
10 × log10(100) for a power ratio.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Decibelpower pass 11 (“20 dBm into milliwatts”) prints:
Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
The words for this pass are decibel, ratio, logarithm, milliwatt, power, decibelpower.
Worked examples
A power ratio of 100
Inputs: Conversion: ratio-to-db | Value: 100
Set Conversion ratio-to-db, then Value 100. Press Convert. The Decibelpower summary should read “Decibelpower: 20 dB”.
Result: Decibelpower: 20 dB
10 × log10(100) for a power ratio.
Power decibels use 10 log10, not 20.
20 dBm into milliwatts
Inputs: Conversion: dbm-to-mw | Value: 20
Set Conversion dbm-to-mw, then Value 20. Press Convert. The Decibelpower summary should read “Decibelpower: 100 milliwatt”.
Result: Decibelpower: 100 milliwatt
0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
0 dBm is defined as 1 milliwatt.
Use cases
- Check “Decibelpower: 20 dB” before trusting a new Decibelpower input.
- Check “Decibelpower: 100 milliwatt” as the second Decibelpower case.
- Power decibels use 10 log10, not 20.
- 0 dBm is defined as 1 milliwatt.
Tips & limitations
- “A power ratio of 100”: Power decibels use 10 log10, not 20.
- “20 dBm into milliwatts”: 0 dBm is defined as 1 milliwatt.
- Decibelpower fields: Conversion, Value.
- The Decibelpower summary for the opening example is “Decibelpower: 20 dB”.
FAQ
What does “A power ratio of 100” return?
Decibelpower summary: “Decibelpower: 20 dB”. Full result: Decibelpower: 20 dB 10 × log10(100) for a power ratio.
What does “20 dBm into milliwatts” return?
Decibelpower summary: “Decibelpower: 100 milliwatt”. Full result: Decibelpower: 100 milliwatt 0 dBm is 1 milliwatt. 20 dBm is 10^(dBm/10) milliwatts.
Which values produce “Decibelpower: 20 dB”?
Conversion: ratio-to-db | Value: 100
Which values produce “Decibelpower: 100 milliwatt”?
Conversion: dbm-to-mw | Value: 20
How is “Decibelpower: 20 dB” different from “Decibelpower: 100 milliwatt”?
“A power ratio of 100” gives “Decibelpower: 20 dB”. “20 dBm into milliwatts” gives “Decibelpower: 100 milliwatt”.
What does Decibelpower include in the full first result?
Decibelpower: 20 dB 10 × log10(100) for a power ratio.
Results are calculated from the values you enter. Double-check measurements and allow a margin before buying materials or making decisions.