🔊Sound Level
NeperをDecibelに換算
Neper（Np）からDecibel（dB）への無料オンライン単位換算ツール。計算式と換算早見表を掲載。
🔊
Sound Level3 単位
⚠️
💡
How the Calculation Works (Linear Scaling)
Formula:
Decibel = Neper × 8.68589
Substitution:1 × 8.68589
Calculated Result:8.6859 dB
Since 1 Neper = 8.68589 Decibels, multiply the value in Nepers by 8.68589.
Standard Ratio Factor:1 Np = 8.68589 dB
Neper to Decibel Conversion Table
Precomputed values for quick reference and printing.
Neper → Decibel(Np → dB)
| Neper | Decibel |
|---|---|
| 1 Np | 8.6859 dB |
| 2 Np | 17.3718 dB |
| 3 Np | 26.0577 dB |
| 4 Np | 34.7436 dB |
| 5 Np | 43.4294 dB |
| 6 Np | 52.1153 dB |
| 7 Np | 60.8012 dB |
| 8 Np | 69.4871 dB |
| 9 Np | 78.173 dB |
| 10 Np | 86.8589 dB |
| 15 Np | 130.2883 dB |
| 20 Np | 173.7178 dB |
| 25 Np | 217.1472 dB |
| 30 Np | 260.5767 dB |
| 40 Np | 347.4356 dB |
| 50 Np | 434.2945 dB |
| 75 Np | 651.4417 dB |
| 100 Np | 868.589 dB |
Decibel → Neper(dB → Np)
| Decibel | Neper |
|---|---|
| 1 dB | 0.1151 Np |
| 2 dB | 0.2303 Np |
| 3 dB | 0.3454 Np |
| 4 dB | 0.4605 Np |
| 5 dB | 0.5756 Np |
| 6 dB | 0.6908 Np |
| 7 dB | 0.8059 Np |
| 8 dB | 0.921 Np |
| 9 dB | 1.0362 Np |
| 10 dB | 1.1513 Np |
| 15 dB | 1.7269 Np |
| 20 dB | 2.3026 Np |
| 25 dB | 2.8782 Np |
| 30 dB | 3.4539 Np |
| 40 dB | 4.6052 Np |
| 50 dB | 5.7565 Np |
| 75 dB | 8.6347 Np |
| 100 dB | 11.5129 Np |
📌 Standard Benchmark Reference Values
1 Np (neper)=≈ 8.68589 dB
International amplitude/field ratio natural logarithmic level ratio (2 / ln(10) B).
Exact RatioNeper (Np)
A logarithmic level ratio unit based on natural logarithms (base e). Under the international amplitude/field ratio convention (ISO 80000-3), 1 Np = ln(e) = 2 / ln(10) B ≈ 0.8685889638 B ≈ 8.685889638 dB.
Decibel (dB)
One tenth of a bel (1 dB = 0.1 B). In acoustic measurements, sound level L (dB) = 10 log₁₀(P/P₀) = 20 log₁₀(p/p₀) for root-power quantities.
🔗