RF Power Units and Conversions
A practical guide to watts, dBm, power ratios, and decibels, focused on building intuition for logarithmic RF units before you try to read a link budget or a bench measurement.
Key formulas
Why logarithmic units help
RF systems often involve gains and losses across large ranges of power. Decibels make those changes easier to compare and combine than raw linear power values.
Once you understand the unit conversions, link budgets and received-power calculations become far easier to follow.
Common mistakes
- Using 20 log10 where 10 log10 is required for power ratios.
- Treating dB as an absolute power unit instead of a relative ratio.
- Mixing dBm and dB in the same expression without tracking what each one represents.
Apply the topic straight away.
Watts to dBm Calculator
Use the Watts to dBm Calculator for quick watts to dbm estimates in RF, radar, and communications work.
dBm to Watts Calculator
Use the dBm to Watts Calculator for quick dbm to watts estimates in RF, radar, and communications work.
Power Ratio to dB Calculator
Use the Power Ratio to dB Calculator for quick power ratio to db estimates in RF, radar, and communications work.
dB to Power Ratio Calculator
Use the dB to Power Ratio Calculator for quick db to power ratio estimates in RF, radar, and communications work.