Some charts to generate results when you only have one d20 available instead of a full set of dice.
d4
| d20 roll | d4 result |
|---|---|
| 1 to 5 | 1 |
| 6 to 10 | 2 |
| 11 to 15 | 3 |
| 16 to 20 | 4 |
d6
| d20 roll | d6 result |
|---|---|
| 1 to 3 | 1 |
| 4 to 6 | 2 |
| 7 to 9 | 3 |
| 10 to 12 | 4 |
| 13 to 15 | 5 |
| 16 to 18 | 6 |
| 19 to 20 | Reroll |
d8
| d20 roll | d8 result |
|---|---|
| 1 to 2 | 1 |
| 3 to 4 | 2 |
| 5 to 6 | 3 |
| 7 to 8 | 4 |
| 9 to 10 | 5 |
| 11 to 12 | 6 |
| 13 to 14 | 7 |
| 15 to 16 | 8 |
| 17 to 20 | Reroll |
d10
| d20 roll | d10 result |
|---|---|
| 1 to 2 | 1 |
| 3 to 4 | 2 |
| 5 to 6 | 3 |
| 7 to 8 | 4 |
| 9 to 10 | 5 |
| 11 to 12 | 6 |
| 13 to 14 | 7 |
| 15 to 16 | 8 |
| 17 to 18 | 9 |
| 19 to 20 | 10 |
d12
| d20 roll | d12 result |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 10 |
| 11 | 11 |
| 12 | 12 |
| 13 to 20 | Reroll |