Tournament Win Probability Calculator Guide
The Tournament Win Probability Calculator estimates each entrant's chance of winning a single-elimination bracket using Monte Carlo simulation. Plug in player names and 1–100 skill ratings, choose a bracket size, and the tool runs thousands of simulated tournaments to surface statistically stable win odds. Use it for esports predictions, sports brackets, or in-office competition planning.
Each head-to-head match resolves with probability skill_i / (skill_i + skill_j). For example, an 80 vs 20 matchup gives the favorite an 80% chance of winning that round. The tool defaults to 10,000 simulations — increase for stability or decrease for speed.
Bracket sizes of 4, 8, and 16 are supported. Results are sorted by win probability so you can spot the favorite at a glance, while underdogs still surface with their realistic non-zero chance to advance.
Frequently Asked Questions
Head-to-head uses skill_i/(skill_i+skill_j); the bracket is simulated 10,000 times.
Any 1–100 scale that captures relative strength works.
Winning requires sweeping every round, so probability compounds downward fast.