dBs (Tables)

02/10/2021

DBs Without a Calculator (or Slide-Rules)

dBs Factor dBs Factor dBs Factor
0 dB 1 10 dB 10 20 dB 100
1 dB 11 dB 21 dB 125 (vs 128)
2 dB 12 dB 16 22 dB
3 dB 2 13 dB 23 dB
4 dB 14 dB 24 dB 250
5 dB 15 dB 32 25 dB
6 dB 4 16 dB 26 dB
7 dB 17 dB 27 dB 500
8 dB 18 dB 64 28 dB
9 dB 8 19 dB 29 dB

Note the "Multipliers" here in Bold.

{ 99 % Accurate }

dBs Factor  Procedure
0 dB 1
1 dB 1.25
2 dB 1.6
3 dB 2 13 dB Gain → 13 → Gain Factor = 20 times
4 dB 2.5 (slice off the Basic dB of 3 from the Multiplier)
5 dB 3.2 ( 3 dB → Gain Factor = 2 )
6 dB 4 ( apply the Multplier of 101 for a Gain Factor of 10 x 2 = 20)
7 dB 5
8 dB 6.4
9 dB 8
10 dB 10

With a calculator: 10 1.3 = x20   {hidden decimal point between the multiplier and basic dB}

Example #1:

38 dB <~< 6.4 x 103= 6,400   (Multiplier is 1,000)

Example #2:

27 dB <~< 5.0 x 102= 500   (Multiplier is 100)