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dB Gain Calculator
Calculate amplifier gain in dB from input and output levels.
bolt Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Gain
Compare Your Options And Get Clear Answers
Calculate amplifier gain in dB from input and output levels.
dB Gain Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Gain = 10 log10(Pout / Pin).
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
dB Quick Guide
Typical values for reference.
| Pin mW | Pout mW | Gain | |
|---|---|---|---|
| 10 | 1000 | 20.00 dB | |
| 1 | 2 | 3.01 dB | |
| 100 | 50 | -3.01 dB | |
| 0.1 | 100 | 30.00 dB | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
dB Gain Calculator FAQ
Answers to common questions about this calculator.
Ten times the log of the power ratio.
The result is negative (loss).
Power relative to 1 mW.
Amplifiers range from 3 to 60 dB.