Opposed dice pool odds calculator

Calculate resolved A-win probability and resolved draw probability with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use resolved A-win probability and resolved draw probability to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Pool A dice
1
Pool A sides
6
Pool B dice
1
Pool B sides
6
Tie treatment: draw or a-wins
draw
Resolved A-win probability
0.416667
Resolved draw probability
0.166667
Resolved B-win probability
0.416667
Expected A-sum minus B-sum
0
Intrinsic equal-sum probability before tie treatment
0.166667

Try another scenario

Pool A dice
1
Pool A sides
6
Pool B dice
1
Pool B sides
6
Tie treatment: draw or a-wins
a-wins
Resolved A-win probability
0.583333
Resolved draw probability
0
Resolved B-win probability
0.416667
Expected A-sum minus B-sum
0
Intrinsic equal-sum probability before tie treatment
0.166667
Calculation method

Calculation method

Resolved A-win probability

Convolve each fair sum distribution and compare every weighted outcome pair; include ties only in a-wins mode.

Resolved draw probability

Equal-sum probability in draw mode, otherwise zero.

Resolved B-win probability

Strict B-sum>A-sum probability.

Expected A-sum minus B-sum

Difference between the two exact sum means.

Intrinsic equal-sum probability before tie treatment

Probability of equal raw sums, reported independently of tie resolution.

Symbols and units
a
Pool A dice
b
Pool A sides
c
Pool B dice
d
Pool B sides
e
Tie treatment: draw or a-wins

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Independent fair SUM pools with the explicit tie rule. This is not an opposed success-count, keep-highest or exploding-pool model; bonuses and strategic choices are not inferred.
Are these inputs private?

These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.

Further reading

OpenStax: finite probability and sampling without replacement; rules are explicit in each worksheet ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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