Nepers to decibels
Type a value in Np to get it in dB instantly.
173.7dB
That's 235,385,266,837× as much as a million times — nothing on our list beats it. That is 2.354×10¹⁷× the power, or 485,200,000× the voltage.
Convert the other way: dB to Np
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 Np to dB
To convert nepers to decibels, multiply by 8.68589.
Example: 20 Np × 8.68589 = 173.718 dB.
In the other direction, 1 dB = 0.115129 Np.
Every unit
Your gain in every unit
Tables
Np to dB conversion table
| Np | dB |
|---|---|
| -20 Np | -173.718 dB |
| -10 Np | -86.8589 dB |
| -6 Np | -52.1153 dB |
| -3 Np | -26.0577 dB |
| 0 Np | 0 dB |
| 3 Np | 26.0577 dB |
| 6 Np | 52.1153 dB |
| 10 Np | 86.8589 dB |
| 20 Np | 173.718 dB |
| 30 Np | 260.577 dB |
| 40 Np | 347.436 dB |
| 60 Np | 521.153 dB |
dB to Np conversion table
| dB | Np |
|---|---|
| -20 dB | -2.30259 Np |
| -10 dB | -1.15129 Np |
| -6 dB | -0.690776 Np |
| -3 dB | -0.345388 Np |
| 0 dB | 0 Np |
| 3 dB | 0.345388 Np |
| 6 dB | 0.690776 Np |
| 10 dB | 1.15129 Np |
| 20 dB | 2.30259 Np |
| 30 dB | 3.45388 Np |
| 40 dB | 4.60517 Np |
| 60 dB | 6.90776 Np |
Quick answers
Quick answers
- How many dB is 1 Np?
- 1 Np is 8.68589 dB.
- How many dB is 10 Np?
- 10 Np is 86.8589 dB.
- How many dB is 20 Np?
- 20 Np is 173.718 dB.
The units
About these units
Nepers (Np)
The natural-log version, used in theory. One neper is 8.686 dB.
Decibels (dB)
The standard logarithmic ratio: ten times the log of a power ratio.
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