This is just an estimate using the formula provided on Diceware. I put this into an Excel spreadsheet to give me an idea of the effectiveness. The random passwords are composed of multiples of 4 symbols. The total number of symbols being 26+26+32+10=92.
| Diceware Words | Basic Entropy | Entropy from adding punctuation | Entropy from adding single digit | Entropy of random password | Effectiveness of Diceware vs. Random |
| |
12.9 | 5.0 | 3.3 | 6.5 | |
| 2 | 25.8 | 30.8 | 34.2 | 52.2 | 65% |
| 3 | 38.8 | 43.8 | 47.1 | 78.3 | 60% |
| 4 | 51.7 | 56.7 | 60.0 | 104.4 | 58% |
| 5 | 64.6 | 69.6 | 72.9 | 130.5 | 56% |