Convert watts to milliwatts, then take ten times the base-10 logarithm. Equivalently, dBm = 10 log10(P in watts) + 30.
How it works in practice
This conversion describes positive power values. It does not establish whether a component can safely handle that power. Use measured or worst-case source output for engineering budgets, and keep average versus peak conventions explicit.
Example and interpretation
5 W is approximately 36.99 dBm; 0.1 W is 20 dBm.
Checks before use
- State watts and waveform convention
- Convert to dBm
- Check rounding
- Compare applicable component ratings
Important limit
Do not convert a peak number and then treat it as average power.
Related Centron RF product
SMA 2 W 6 GHz fixed attenuator. Use calculated levels to define a requirement, then compare it with the exact product’s current bandwidth, input power, impedance and available attenuation options. Calculations assume stated conditions and do not replace a component datasheet.
Further reading
Keysight: Fundamentals of RF and Microwave Power Measurements. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.