Question: 1 decibel is equal to how many neper?
Answer: values of interest, and ln is the natural logarithm, i.e., logarithm to the base e. Note 3: One neper Np ≡ 20 / (ln10) = 8.685889638 dB. the decibel is also used to express power ratios. Note 5: Like the decibel dB, the Np is a dimensionless unit.