Table Of Contents
Neper to decibel Conversion
1 neper (Np) is equal to 8.685889638 decibel (dB).
1 Np = 8.685889638 dB
or
1 dB = 0.1151292546 Np
Formula
To convert a sound level from neper (Np) to decibel (dB), multiply the sound level in neper by 8.685889638
s(dB) = s(Np) × 8.685889638
Examples:
Convert 1000 neper to decibel:
s(dB) = 1000Np × 8.685889638 = 8685.889638 dB
Conversion table
| Neper (Np) | Decibel (dB) |
|---|---|
| 1 Np | 8.685889638 dB |
| 2 Np | 17.371779276 dB |
| 3 Np | 26.057668914 dB |
| 5 Np | 43.42944819 dB |
| 10 Np | 86.858896381 dB |
| 20 Np | 173.717792761 dB |
| 25 Np | 217.147240952 dB |
| 50 Np | 434.294481903 dB |
| 100 Np | 868.588963807 dB |
| 250 Np | 2171.472409516 dB |
| 500 Np | 4342.944819033 dB |
| 1000 Np | 8685.889638065 dB |
| Decibel (dB) | Neper (Np) |
|---|---|
| 1 dB | 0.115129255 Np |
| 2 dB | 0.230258509 Np |
| 3 dB | 0.345387764 Np |
| 5 dB | 0.575646273 Np |
| 10 dB | 1.151292546 Np |
| 20 dB | 2.302585093 Np |
| 25 dB | 2.878231366 Np |
| 50 dB | 5.756462732 Np |
| 100 dB | 11.512925465 Np |
| 250 dB | 28.782313662 Np |
| 500 dB | 57.564627325 Np |
| 1000 dB | 115.12925465 Np |
Frequently asked questions
How do I convert neper to decibel?
Multiply the value in neper by 8.685889638 to get the result in decibel. For example, 5 Np × 8.685889638 = 43.42944819 dB.
How many decibel are in 1 neper?
1 neper (Np) is equal to 8.685889638 decibel (dB).
How do I convert decibel back to neper?
Use the inverse operation: divide the value in decibel by 8.685889638 to get the result in neper.
How accurate is the neper to decibel conversion?
The converter multiplies by the conversion factor 8.685889638 and rounds the result to 9 decimal places by default. You can increase or reduce the precision with the digits option on this page.
Sources
Conversion factors are based on internationally recognised standards:
