dBm to dBf Calculator

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

dBf to dBm

Formula

dBf = dBm + 120

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.