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Watts to dB Converter Calculator
Convert power in watts to decibels relative to 1 watt, 1 milliwatt, or 1 picowatt.
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Convert power in watts to decibels relative to 1 watt, 1 milliwatt, or 1 picowatt.
Watts to dB Converter Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: dB = 10 x log10(power / reference power).
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
Watts Quick Guide
Typical values for reference.
| Watts | dBW | dBm | dB re 1 W |
|---|---|---|---|
| 0.001 | -30.0 | 0.0 | -30.0 |
| 0.1 | -10.0 | 20.0 | -10.0 |
| 1 | 0.0 | 30.0 | 0.0 |
| 10 | 10.0 | 40.0 | 10.0 |
| 100 | 20.0 | 50.0 | 20.0 |
| 1000 | 30.0 | 60.0 | 30.0 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Watts to dB Calculator FAQ
Answers to common questions about this calculator.
Take 10 times the base-10 log of the power divided by the reference.
Decibels relative to 1 milliwatt.
dB = 10 x log10(power / reference power).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.