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Log Kill or Log Reduction is a mathematical term used to show the relative number of live microbes (bacterium that causes disease or fermentation) eliminated from a surface by disinfecting or cleaning.
Log Reduction is used in the testing and certification of cleaning and sanitising products to EN Standards.
A summary of log reduction values using a starting point of 1,000,000 is shown below for reference:
Log Kill Reductions
| Log Reduction No. | Percentage Reduction | Material Left |
| 0 | 0% | 1,000,0000 |
| 1 | 90% | 100,000 |
| 2 | 99% | 10,000 |
| 3 | 99.9% | 1,000 |
| 4 | 99.99% | 100 |
| 5 | 99.999% | 10 |
| 6 | 99.9999% | 1 |
| 7 | 99.99999% |
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