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Woloshin S, Schwartz LM, Welch HG. Know Your Chances: Understanding Health Statistics. Berkeley (CA): University of California Press; 2008.
| 1 in __ | Decimal | Percent | __ out of 1,000 |
|---|---|---|---|
| 1 in 1 | 1.00 | 100% | 1,000 out of 1,000 |
| 1 in 2 | 0.50 | 50% | 500 out of 1,000 |
| 1 in 3 | 0.33 | 33% | 333 out of 1,000 |
| 1 in 4 | 0.25 | 25% | 250 out of 1,000 |
| 1 in 5 | 0.20 | 20% | 200 out of 1,000 |
| 1 in 6 | 0.17 | 17% | 167 out of 1,000 |
| 1 in 7 | 0.14 | 14% | 143 out of 1,000 |
| 1 in 8 | 0.13 | 13% | 125 out of 1,000 |
| 1 in 9 | 0.11 | 11% | 111 out of 1,000 |
| 1 in 10 | 0.10 | 10% | 100 out of 1,000 |
| 1 in 20 | 0.05 | 5.0% | 50 out of 1,000 |
| 1 in 25 | 0.04 | 4.0% | 40 out of 1,000 |
| 1 in 50 | 0.02 | 2.0% | 20 out of 1,000 |
| 1 in 100 | 0.01 | 1.0% | 10 out of 1,000 |
| 1 in 200 | 0.0050 | 0.50% | 5 out of 1,000 |
| 1 in 250 | 0.0040 | 0.40% | 4 out of 1,000 |
| 1 in 300 | 0.0033 | 0.33% | 3.3 out of 1,000 |
| 1 in 400 | 0.0025 | 0.25% | 2.5 out of 1,000 |
| 1 in 500 | 0.0020 | 0.20% | 2.0 out of 1,000 |
| 1 in 600 | 0.0017 | 0.17% | 1.7 out of 1,000 |
| 1 in 700 | 0.0014 | 0.14% | 1.4 out of 1,000 |
| 1 in 800 | 0.0013 | 0.13% | 1.3 out of 1,000 |
| 1 in 900 | 0.0011 | 0.11% | 1.1 out of 1,000 |
| 1 in 1,000 | 0.0010 | 0.10% | 1.0 out of 1,000 |
| 1 in 2,000 | 0.00050 | 0.050% | 0.50 out of 1,000 |
| 1 in 3,000 | 0.00033 | 0.033% | 0.33 out of 1,000 |
| 1 in 4,000 | 0.00025 | 0.025% | 0.25 out of 1,000 |
| 1 in 5,000 | 0.00020 | 0.020% | 0.20 out of 1,000 |
| 1 in 10,000 | 0.00010 | 0.010% | 0.10 out of 1,000 |
| 1 in 25,000 | 0.00004 | 0.004% | 0.040 out of 1,000 |
| 1 in 50,000 | 0.00002 | 0.002% | 0.020 out of 1,000 |
| 1 in 100,000 | 0.00001 | 0.001% | 0.010 out of 1,000 |
| 1 in 1,000,000 | 0.000001 | 0.0001% | 0.001 out of 1,000 |
Note: For numbers less than 1 out of 1,000 (such as 0.50 out of 1,000), it is clearer to recast them as “___ out of 10,000” (“5 out of 10,000,” for instance), because it allows you to use a whole number rather than a decimal.
From: Number Converter and Risk Charts
Know Your Chances: Understanding Health Statistics is hereby licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported license, which permits copying, distribution, and transmission of the work, provided the original work is properly cited, not used for commercial purposes, nor is altered or transformed.
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