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Decibels (dB) Calculator

See our other Electronics Calculators.

Decibels are defined as ten times the log of a power ratio.  Decibels convert multiplication and division calculations into simple addition and subtraction operations. 

This calculator converts between decibels, voltage gain (or current), and power gain.  Just fill in one field and the calculator will convert the other two fields. 


dB= 20log(V1/V2)= 10log(P1/P2)

Decibels (dB)  Voltage Gain Power Gain 

The dBm is a logarithmic measure of power compared to 1mW. It can be converted to a voltage, if the load is known.  Typically the load is 50 ohms.


dBm= 10log(p1/.001)

dBm Power(Watts) Voltage DC Vp of Sinusoid

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