Decibel Gain Table: Gain by Input power
Reference table of gain for Decibel Gain across a range of input power values — exact, engine-computed figures you can read off at a glance.
Decibel Gain Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Gain
20.0000
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Decibel Gain Calculator
The Decibel Gain Calculator works out your gain in an instant. Enter input power and output power and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the input power.
- Enter the output power.
- Read off your gain — the calculator updates automatically, with no button to press.
Worked example
For example, with input power of 1 W and output power of 100 W, the gain is 20.0000.
| Input power | 1 W |
|---|---|
| Output power | 100 W |
| Gain | 20.0000 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
Use 10 × log10(output ÷ input). Going from 1 W to 100 W is a 20 dB gain.
They compress large ratios into manageable numbers and let gains add instead of multiply.
A loss: the output power is less than the input.
Yes. Voltage gain uses 20 × log10(ratio), since power depends on voltage squared.
Enter the input power. Enter the output power. Read off your gain — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Decibel Gain: Formula, Steps & Examples
Learn how to calculate Decibel Gain — the formula explained step by step, with worked examples and a free calculator to check your answer.