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Table I: dB Conversions for 50 Ohm Reference Impedance

Convert
From To

dBm dBV dBmV dBmV

dBm 0 -13 +47 +107

dBV +13 0 +60 +120

dBmV -47 -60 0 +60

dBmV -107 -120 -60 0

Table II: dB Conversions for 75 Ohm Reference Impedance

Convert
From To

dBm dBV dBmV dBmV

dBm 0 -11.25 +48.75 +108.75

dBV +11.25 0 +60 +120

dBmV -48.75 -60 0 +60

dBmV -108.75 -120 -60 0

Example: Convert +10 dBm to dBmV

A. 50 Ohm Reference Impedance: dBmV = +10 dBm + 47 dB = +57 dBmV

B. 75 Ohm Reference Impedance: dBmV = +10 dBm + 48.75 dB = +58.75 dBmV

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Convert From	To
		dBm	dBV	dBmV	dBmV
	dBm	0	-13	+47	+107
	dBV	+13	0	+60	+120
	dBmV	-47	-60	0	+60
	dBmV	-107	-120	-60	0