Convert neper to decibel instantly. Type in either field — results update live.
Selected Np values converted to dB using the exact factor from this tool.
| Np | dB |
|---|---|
| 0.01 | 0.08685889638 |
| 0.1 | 0.8685889638 |
| 1 | 8.685889638 |
| 2 | 17.371779276 |
| 3 | 26.057668914 |
| 5 | 43.42944819 |
| 10 | 86.85889638 |
| 20 | 173.71779276 |
| 50 | 434.2944819 |
| 100 | 868.5889638 |
| 1,000 | 8,685.889638 |
Exact conversion factors in both directions, plus a worked example.
1 Np = 8.685889638 dB
1 dB = 0.1151292547 Np
To convert neper to decibel, multiply by 8.685889638.
To convert decibel to neper, multiply by 0.1151292547.
Example: convert 10 Np to dB
10 × 8.685889638 = 86.85889638 dB
Short background on the units used in this conversion.
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.
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.
dB = Np × 8.685889638Np = dB × 0.11512925465, using the same exact factors as this converter.