Decibel (dB)
The decibel (dB) equals 0.1 bel — one tenth of a bel, the most common logarithmic level unit.
Decibels rate sound pressure level, audio gain, and signal-to-noise ratios — the priority search term for sound conversions.
Decibel to Neper
Convert decibel to neper instantly. Type in either field — results update live.
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sound Decibel Neper
1 decibel = 0.11512925465 nepers
Unit
Unit
Conversion table
Selected dB values converted to Np using the exact factor from this tool.
| dB | Np |
|---|---|
| 0.01 | 0.0011512925465 |
| 0.1 | 0.011512925465 |
| 1 | 0.11512925465 |
| 2 | 0.2302585093 |
| 3 | 0.34538776395 |
| 5 | 0.57564627325 |
| 10 | 1.1512925465 |
| 20 | 2.302585093 |
| 50 | 5.7564627325 |
| 100 | 11.5129254651 |
| 1,000 | 115.1292546506 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 dB = 0.1151292547 Np
1 Np = 8.685889638 dB
To convert decibel to neper, multiply by 0.1151292547.
To convert neper to decibel, multiply by 8.685889638.
Example: convert 10 dB to Np
10 × 0.1151292547 = 1.1512925465 Np
About these units
Short background on the units used in this conversion.
Neper (Np)
The neper (Np) equals approximately 0.8686 bel — the SI logarithmic unit for field quantities, using natural logarithms.
Nepers appear in engineering acoustics and signal theory; 1 Np ≈ 8.686 dB relates ratios logarithmically, not as a simple multiplier.
Frequently asked questions
How many nepers are in one decibel?
One decibel equals 0.11512925465 nepers. Multiply your decibels value by 0.11512925465 to convert to nepers.
What is the conversion formula?
Np = dB × 0.11512925465The reverse is
dB = Np × 8.685889638, using the same exact factors as this converter.Is this Decibel to Neper converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.