Decision Probability Calculator

Scope of this calculation

Use this page when the task is to combine a baseline probability with explicit adjustments and confidence weighting. When using the result, another period or grading basis is a different question.

Decision Probability depends on the event scope represented by Baseline probability and Confidence weight.

A goes-the-distance question belongs in the Goes-the-Distance, not as an adjustment here.

Arithmetic used on this page

Both participants must be measured on one consistent rating system.

Fair-price conversion does not validate the ratings.

In the current scenario, the calculation can be reproduced without an unstated correction.

Within this calculation, a material participant, format, or source change requires a new adjusted probability baseline.

On this page, a difficult weight cut, replacement opponent, or round-format change warrants a new calculation.

Under the entered assumptions, weigh-in information, reach, pace, style matchup, recent activity, and judging format should refer to the scheduled bout.

Entries required for the result

• For this market, use a current source for Baseline probability. Here it means starting probability before adjustments.
• Label Primary adjustment as observed, quoted, or projected. Its role is first percentage-point adjustment.
• For the saved case, check the timestamp and unit for Secondary adjustment because it supplies second percentage-point adjustment.
• Label Confidence weight as observed, quoted, or projected. Its role is share of the adjusted estimate to retain. The remainder moves toward 50%.

At this stage, keep percentages, prices, time, scoring units, and signs in the printed format.

For this comparison, a separate input set allows inspection without overwriting the baseline.

For the Decision Probability Calculator, use the worked case as a reproducibility check before entering live market assumptions. None of its values should be copied automatically.

Applying the Decision Probability rule: final probability = 50% + (baseline + adjustments − 50%) × confidence weight.

For this adjusted probability example, when the worked result differs, verify the field values one by one rather than changing several assumptions together.

As a practical check, keep the example separate from the saved market case.

Comparing two plausible cases

• For this market, create a neutral case before applying the full change to Confidence weight.
• Under the entered assumptions, shrink a small-sample rating gap toward the broader baseline.
• At this stage, a large fair-price swing signals sensitivity to scale or confidence.

Meaning of the displayed number

Use model chance as one translation of relative strength.

Price conversion cannot make stale ratings reliable.

For the saved case, a difference should survive one reasonable adverse case.

The Fighter Age Adjustment handles a different calculation and should open as a new case.

Keeping the calculation reproducible

A useful Decision Probability record identifies period, market price, and projected-field sources.

A useful Decision Probability record identifies period, market price, and projected-field sources.

As a practical check, keep source revisions and market moves as different update reasons.

Unmodeled information

• Adjustments are percentage points, not multiplicative percentages.
• For this comparison, verify scheduled rounds, no-contest treatment, method definitions, and the official-result policy.
• In this model, the page cannot determine whether a sportsbook applies a settlement exception.

Market compatibility questions