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Voltage to dB Calculator
Convert a voltage to dBV, dBu or dBmV relative to common reference levels.
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Level in dBV
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Convert a voltage to dBV, dBu or dBmV relative to common reference levels.
Voltage to dB Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: dBV = 20 x log10(V / 1 V).
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.
| Volts | dBV | dBu | dBmV |
|---|---|---|---|
| 0.001 V | -60.00 dBV | -57.78 dBu | 0.0 dBmV |
| 0.316 V | -10.01 dBV | -7.79 dBu | 50.0 dBmV |
| 1 V | 0.00 dBV | 2.22 dBu | 60.0 dBmV |
| 1.228 V | 1.78 dBV | 4.00 dBu | 61.8 dBmV |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Voltage to dB Calculator FAQ
Answers to common questions about this calculator.
Decibels relative to 1 volt RMS.
Decibels relative to 0.7746 volts.
+4 dBu, about 1.228 V.
-10 dBV, about 0.316 V.