Absorbance to decibels
Type a value in A to get it in dB instantly.
10dB
That's 3.2× as dark as the best measuring range, while a strongly colored sample is 10× darker. About 10% of the light gets through.
What it means
How much light gets through?
Above about 2 the detector is measuring very little light, and stray light dominates. Dilute the sample rather than trusting the reading.
The math
How to convert A to dB
To convert absorbance to decibels, multiply by 10.
Example: 1 A × 10 = 10 dB.
In the other direction, 1 dB = 0.1 A.
Every unit
Your absorbance in every unit
Tables
A to dB conversion table
| A | dB |
|---|---|
| 0.01 A | 0.1 dB |
| 0.05 A | 0.5 dB |
| 0.1 A | 1 dB |
| 0.3 A | 3 dB |
| 0.5 A | 5 dB |
| 0.7 A | 7 dB |
| 1 A | 10 dB |
| 1.5 A | 15 dB |
| 2 A | 20 dB |
| 3 A | 30 dB |
| 4 A | 40 dB |
dB to A conversion table
| dB | A |
|---|---|
| 0.01 dB | 0.001 A |
| 0.05 dB | 0.005 A |
| 0.1 dB | 0.01 A |
| 0.3 dB | 0.03 A |
| 0.5 dB | 0.05 A |
| 0.7 dB | 0.07 A |
| 1 dB | 0.1 A |
| 1.5 dB | 0.15 A |
| 2 dB | 0.2 A |
| 3 dB | 0.3 A |
| 4 dB | 0.4 A |
Quick answers
Quick answers
- How many dB is 1 A?
- 1 A is 10 dB.
- How many dB is 10 A?
- 10 A is 100 dB.
The units
About these units
Absorbance (A)
The base-ten logarithm of what is blocked. Proportional to concentration.
Decibels (dB)
Optical attenuation in decibels. One absorbance unit is 10 dB.
Keep going