Nepers to decibels
Type a value in Np to get it in dB instantly.
521.2dB
That's 11,420,073,898,156,814,000× as loud as a jet taking off — nothing on our list beats it. That carries about 1.304×10⁴⁶× the sound energy of ordinary conversation.
What it means
How loud is that?
Decibels here are dB SPL, referenced to 20 micropascals, the quietest sound a young ear can detect.
The math
How to convert Np to dB
To convert nepers to decibels, multiply by 8.68589.
Example: 60 Np × 8.68589 = 521.153 dB.
In the other direction, 1 dB = 0.115129 Np.
Every unit
Your sound level in every unit
Tables
Np to dB conversion table
| Np | dB |
|---|---|
| 10 Np | 86.8589 dB |
| 20 Np | 173.718 dB |
| 30 Np | 260.577 dB |
| 40 Np | 347.436 dB |
| 50 Np | 434.294 dB |
| 60 Np | 521.153 dB |
| 70 Np | 608.012 dB |
| 80 Np | 694.871 dB |
| 85 Np | 738.301 dB |
| 90 Np | 781.73 dB |
| 100 Np | 868.589 dB |
| 110 Np | 955.448 dB |
| 120 Np | 1,042.31 dB |
| 130 Np | 1,129.17 dB |
dB to Np conversion table
| dB | Np |
|---|---|
| 10 dB | 1.15129 Np |
| 20 dB | 2.30259 Np |
| 30 dB | 3.45388 Np |
| 40 dB | 4.60517 Np |
| 50 dB | 5.75646 Np |
| 60 dB | 6.90776 Np |
| 70 dB | 8.05905 Np |
| 80 dB | 9.21034 Np |
| 85 dB | 9.78599 Np |
| 90 dB | 10.3616 Np |
| 100 dB | 11.5129 Np |
| 110 dB | 12.6642 Np |
| 120 dB | 13.8155 Np |
| 130 dB | 14.9668 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 60 Np?
- 60 Np is 521.153 dB.
The units
About these units
Nepers (Np)
The natural-logarithm cousin of the decibel: 1 Np is 8.686 dB.
Decibels (dB)
The standard measure of sound level, referenced to the threshold of hearing.
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