As we know One dB is equal to 0.1151277918 Np (1 dB = 0.1151277918 Np).

To convert Decibel to Neper, multiply your dB figure by 0.1151277918.

Example : convert 25 dB to Np:

25 dB = 25 × 0.1151277918 Np = Np

To convert Neper to Decibel, divide your Np figure by 0.1151277918.

Example : convert 25 Np to dB:

25 Np = 25 ÷ 0.1151277918 dB = dB