As we know One Np is equal to 8.6860000037 dB (1 Np = 8.6860000037 dB).

To convert Neper to Decibel, multiply your Np figure by 8.6860000037.

Example : convert 25 Np to dB:

25 Np = 25 × 8.6860000037 dB = dB

To convert Decibel to Neper, divide your dB figure by 8.6860000037.

Example : convert 25 dB to Np:

25 dB = 25 ÷ 8.6860000037 Np = Np