dB Voltage Ratio

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Voltage A

volts

Voltage B

volts

dB

dB

This calculation will give you the ratio, in decibels, between two voltages. For example, you can calculate the gain needed to raise the output level from 0.775 volts to 1.4 volts. You can also use this to calculate how much attenuation you need if, for instance, you have a 2.0 volt input level and you need to attenuate it to 0.2 volts to prevent input overload. 

Enter any two values and press "Calculate" for the remaining value. Press "Reset" before performing each calculation.

Equation used to calculate the data:
dB = 20 * Log (Vout / Vin)