| Group Size | Prob(same birthday) |
| 2 | 0.3 |
| 3 | 0.8 |
| 4 | 1.6 |
| 5 | 2.7 |
| 6 | 4.0 |
| 7 | 5.6 |
| 8 | 7.4 |
| 9 | 9.5 |
| 10 | 11.7 |
| 11 | 14.1 |
| 12 | 16.7 |
| 13 | 19.4 |
| 14 | 22.3 |
| 15 | 25.3 |
| 16 | 28.4 |
| 17 | 31.5 |
| 18 | 34.7 |
| 19 | 37.9 |
| 20 | 41.1 |
| 21 | 44.4 |
| 22 | 47.6 |
| 23 | 50.7 |
| 24 | 53.8 |
| 25 | 56.9 |
| 26 | 59.8 |
| 27 | 62.7 |
| 28 | 65.4 |
| 29 | 68.1 |
| 30 | 70.6 |
| 31 | 73.0 |
| 32 | 75.3 |
| 33 | 77.5 |
| 34 | 79.5 |
| 35 | 81.4 |
| 36 | 83.2 |
| 37 | 84.9 |
| 38 | 86.4 |
| 39 | 87.8 |
| 40 | 89.1 |
| 41 | 90.3 |
| 42 | 91.4 |
| 43 | 92.4 |
| 44 | 93.3 |
| 45 | 94.1 |
| 46 | 94.8 |
| 47 | 95.5 |