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Voltage Gain dB Calculator
Convert a voltage gain or attenuation ratio into decibels, and the reverse.
bolt Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Gain in dB
Compare Your Options And Get Clear Answers
Convert a voltage gain or attenuation ratio into decibels, and the reverse.
Voltage Gain dB Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: dB = 20 x log10(Vout / Vin).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Voltage Quick Guide
Typical values for reference.
| Vin | Vout | Spare | Gain |
|---|---|---|---|
| 1 V | 2 V | – | 6.02 dB |
| 1 V | 10 V | – | 20.00 dB |
| 1 V | 100 V | – | 40.00 dB |
| 10 V | 5 V | – | -6.02 dB |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Voltage Gain dB Calculator FAQ
Answers to common questions about this calculator.
Take 20 times the base-10 log of the ratio.
Power goes with voltage squared.
Voltage doubles.
About 0.707 of the voltage.