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Target number odds

The chance of hitting the number you need, on any roll and with any modifier.

Every target on a d20

Each point of target number costs exactly 5%, because a d20 has twenty equally likely faces. That also means every +1 modifier is worth exactly 5% more, no matter what you are rolling against.

Chance of meeting or beating each target number on a d20
NeedChanceOdds
1+100%1 in 1
2+95%1 in 1.05
3+90%1 in 1.11
4+85%1 in 1.18
5+80%1 in 1.25
6+75%1 in 1.33
7+70%1 in 1.43
8+65%1 in 1.54
9+60%1 in 1.67
10+55%1 in 1.82
11+50%1 in 2
12+45%1 in 2.22
13+40%1 in 2.5
14+35%1 in 2.86
15+30%1 in 3.33
16+25%1 in 4
17+20%1 in 5
18+15%1 in 6.67
19+10%1 in 10
20+5%1 in 20

Any other roll

Enter your roll, including any modifier, then drag to the number you need.

Lowest
6
Highest
25
Average
15.5
Most likely
6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25
Every result of 1d20+5
  • 65%
  • 75%
  • 85%
  • 95%
  • 105%
  • 115%
  • 125%
  • 135%
  • 145%
  • 155%
  • 165%
  • 175%
  • 185%
  • 195%
  • 205%
  • 215%
  • 225%
  • 235%
  • 245%
  • 255%

Odds against a target

Pick the number you need to hit.