Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Input voltage (V)

Required number input.

Output voltage (V)

Required number input.

Express a voltage ratio as a decibel gain. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Gain (dB)

The resulting gain returned as a number.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

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  Compute an amplitude ratio in decibels across equal impedances, dB = 20 * log10(V2 / V1); a tenfold voltage increase is +20 dB.

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  Convert an equalizer's high-frequency-to-reference voltage gain ratio to decibels; both gains must use the same amplitude convention.