What does this tool calculate?
Convert logarithmic power in dBm to watts or milliwatts and convert watts back to dBm.
dBm to Watts Calculator
Convert logarithmic power in dBm to watts or milliwatts and convert watts back to dBm.
Enter conversion details
Complete the fields below, then select Calculate.
About this converter
How to use dBm to Watts Calculator, plus the formulas and logic behind the results.
Tool description
Convert logarithmic power in dBm to watts or milliwatts and convert watts back to dBm. It provides an immediate educational result using the definitions shown below.
How to use
- Enter the value or text you want to convert.
- Choose the applicable units, direction, or mode.
- Select Calculate to produce the result.
- Review the formula and note before using the result.
Formulas & reference
P(mW) = 10^(dBm/10)dBm = 10 × log10(P(mW))
Calculation logic
Power is normalized to milliwatts; the calculator reports dBm, milliwatts, and watts.
Watts and milliwatts must be positive when converting to dBm.
dBm to Watts Calculator FAQ
Common questions about this conversion and how to interpret the result.
How do I use this calculator?
Complete the input fields, choose the required options, and select Calculate.
Which formula is used?
P(mW) = 10^(dBm/10)
Are results rounded?
Calculations use full floating-point precision; displayed values are formatted for readability.
Can I enter decimal values?
Yes. Numeric fields accept decimal values unless a field specifically represents text.
Is the result authoritative?
No. It is an educational estimate; verify critical engineering, billing, health, or safety work independently.