dBf to dBm Calculator

This tool converts from dBf (deciBel Femtowatt) to dBm (deciBel milliwatt) and Watt.

dBm to dBf

Formula

dBm = dBf – 120

P_dBf = 10*log₁₀(P_fW)

1 Femtowatt = 10^-15 Watt

1 Watt = 10¹⁵ Femtowatt

Background

dBf is used to specify the sensitivity of Frequency Modulation (FM) Radio receivers. dBm is generally used for RF power measurements.

Related Calculators

FM Receiver Sensitivity