Absorbance to percent transmittance
Type a value in A to get it in %T instantly.
10%T
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.
Convert the other way: %T to A
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 %T
Absorbance is a logarithm of transmittance: A = −log₁₀(T), and back again %T = 10^(−A) × 100. One absorbance unit is a tenfold cut.
Example: 1 A = 10 %T.
Every unit
Your absorbance in every unit
Tables
A to %T conversion table
| A | %T |
|---|---|
| 0.01 A | 97.7237 %T |
| 0.05 A | 89.1251 %T |
| 0.1 A | 79.4328 %T |
| 0.3 A | 50.1187 %T |
| 0.5 A | 31.6228 %T |
| 0.7 A | 19.9526 %T |
| 1 A | 10 %T |
| 1.5 A | 3.16228 %T |
| 2 A | 1 %T |
| 3 A | 0.1 %T |
| 4 A | 0.01 %T |
%T to A conversion table
| %T | A |
|---|---|
| 0.01 %T | 4 A |
| 0.05 %T | 3.30103 A |
| 0.1 %T | 3 A |
| 0.3 %T | 2.52288 A |
| 0.5 %T | 2.30103 A |
| 0.7 %T | 2.1549 A |
| 1 %T | 2 A |
| 1.5 %T | 1.82391 A |
| 2 %T | 1.69897 A |
| 3 %T | 1.52288 A |
| 4 %T | 1.39794 A |
Quick answers
Quick answers
- How many %T is 1 A?
- 1 A is 10 %T.
- How many %T is 10 A?
- 10 A is 1×10⁻⁸ %T.
The units
About these units
Absorbance (A)
The base-ten logarithm of what is blocked. Proportional to concentration.
Percent transmittance (%T)
How much light gets through, as a percentage.
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