Power ratio to decibels
Type a value in × to get it in dB instantly.
That's 2× as much as ten times the power, while a hundred times is 5× higher. That is 20× the power, or 4.472× the voltage.
Convert the other way: dB to ×
What it means
How much is that?
These are plain ratio decibels. Decibels with a letter after them — dBm, dBW, dBµV — are levels against a fixed reference, which is a different page.
The math
How to convert × to dB
Decibels are logarithmic, and power and amplitude use different multipliers: dB = 10 × log₁₀(power ratio) but dB = 20 × log₁₀(voltage ratio). Back the other way, the ratio is 10^(dB ÷ 10) or 10^(dB ÷ 20).
Example: 20 × = 13.0103 dB.
Every unit
Your gain in every unit
Tables
× to dB conversion table
| × | dB |
|---|---|
| 0.01 × | -20 dB |
| 0.1 × | -10 dB |
| 0.251 × | -6.00326 dB |
| 0.501 × | -3.00162 dB |
| 1 × | 0 dB |
| 2 × | 3.0103 dB |
| 3.98 × | 5.99883 dB |
| 10 × | 10 dB |
| 100 × | 20 dB |
| 1,000 × | 30 dB |
| 10,000 × | 40 dB |
| 1,000,000 × | 60 dB |
dB to × conversion table
| dB | × |
|---|---|
| -20 dB | 0.01 × |
| -10 dB | 0.1 × |
| -6 dB | 0.251189 × |
| -3 dB | 0.501187 × |
| 0 dB | 1 × |
| 3 dB | 1.99526 × |
| 6 dB | 3.98107 × |
| 10 dB | 10 × |
| 20 dB | 100 × |
| 30 dB | 1,000 × |
| 40 dB | 10,000 × |
| 60 dB | 1,000,000 × |
Quick answers
Quick answers
- How many dB is 1 ×?
- 1 × is 0 dB.
- How many dB is 10 ×?
- 10 × is 10 dB.
- How many dB is 20 ×?
- 20 × is 13.0103 dB.
The units
About these units
Power ratio (×)
How many times the power: 10 dB is ten times.
Decibels (dB)
The standard logarithmic ratio: ten times the log of a power ratio.
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