Reviewed By: Patrick Myers (BSME)
Enter the total amount of absorbance into the calculator to determine the percentage transmittance.
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Absorbance to Transmittance Formula
The following formula is used to calculate the percent transmittance from absorbance.
T = anti-log (2 - a)
- Where T is the percent transmittance
- a is the absorbance
To calculate transmittance from absorbance, take the inverse log of 2 minus the absorbance.
| Absorbance (A) | Transmittance (%) |
|---|---|
| 0.0 | 100.000 |
| 0.1 | 79.433 |
| 0.2 | 63.096 |
| 0.3 | 50.119 |
| 0.4 | 39.811 |
| 0.5 | 31.623 |
| 0.6 | 25.119 |
| 0.7 | 19.953 |
| 0.8 | 15.849 |
| 0.9 | 12.589 |
| 1.0 | 10.000 |
| 1.1 | 7.943 |
| 1.2 | 6.310 |
| 1.3 | 5.012 |
| 1.4 | 3.981 |
| 1.5 | 3.162 |
| 1.6 | 2.512 |
| 1.7 | 1.995 |
| 1.8 | 1.585 |
| 1.9 | 1.259 |
| Relationship: T% = 100 × 10^(−A); equivalently A = −log10(T% / 100). Values rounded to 3 decimals. | |
Absorbance to Transmittance Definition
Converting an absorbance to transmittance involves taking the antilog of 2 minus the absorbance.
Absorbance to Transmittance Example
How to convert absorbance to transmittance?
- First, determine the absorbance.
Calculate the absorbance of the surface of the material.
- Next, calculate the transmittance.
Calculate the percent transmittance using the formula above.
FAQ
What is transmittance?
Transmittance is a measure of the effectiveness of the surface of the material in transmitting radiant energy.
