effective bonus/penalty from (dis-)advantage on D&D 5e d20 rolls

gistfile1.txt

needed normally | equiv % with advantage | ADV bonus | equiv % with disadvantage | DISADV penalty
20              | 19                     | +1        | 21                       | -1
19              | 17                     | +2        | 21                       | -2
18              | 15.5                   | +2.5      | 20.5                     | -2.5
17              | 14                     | +3        | 20                        | -3
16              | 12                     | +4        | 20                        | -4
15              | 11                     | +4        | 19                        | -4
14              | 9.5                    | +4.5      | 18.5                      | -4.5
13              | 8                      | +5        | 18                        | -5
12              | 7                      | +5        | 17                        | -5
11              | 6                      | +5        | 16                        | -5
10              | 5                      | +5        | 15                        | -5
9               | 4                      | +5        | 14                        | -5
8               | 3.5                    | +4.5      | 12.5                      | -4.5
7               | 3                      | +4        | 11                        | -4
6               | 2                      | +4        | 9.5                       | -3.5
5               | 2                      | +3        | 8                         | -3
4               | 1.5                    | +2.5      | 6.5                       | -2.5
3               | 1                      | +2        | 5                         | -2
2               | 1                      | +1        | 3                         | -1
1               | 1                      | +0        | 1                         | 0