Win Percentage Calculator: Record, Target and Projection

How winning percentage is calculated

For a record with no ties, winning percentage is wins divided by total games, multiplied by 100. When ties are present, this calculator uses the selected tie value:

Winning percentage = (wins + tie value × ties) ÷ (wins + losses + ties) × 100

The common half-win convention gives each tie a value of 0.5. Some sports and ranking systems treat ties differently, so the selector also supports 0 or 1.

Target and projection formulas

Future wins, losses, and ties are added to the current record before the projected percentage is calculated. For a target expressed as a decimal p, current credited wins s, and current games g, the calculator finds the smallest whole number x satisfying (s + x) ÷ (g + x) ≥ p. It also finds how many additional consecutive losses can occur while s ÷ (g + x) ≥ p remains true.

Examples

• An 8–2 record has an 80% winning percentage.
• A 9–0–1 record with a tie worth 0.5 has a 95% winning percentage.
• A 0–0–2 record with half-win ties has a 50% winning percentage.
• An 8–2 record followed by two wins and one loss projects to 10–3, or 76.92%.
• A 50–50 record needs 25 consecutive wins to reach 60%.
• An 80–20 record can absorb six consecutive losses and remain at or above 75%.

Important limits

• The tool is arithmetic only. It does not predict the outcome of future games.
• League rules may use points, overtime results, forfeits, or tiebreakers that differ from a simple win percentage.
• A 100% target is impossible after any uncredited result; the calculator reports that case explicitly.
• Each record input is limited to one million to prevent accidental oversized entries.

Related calculators

Use the Percentage Calculator for general percent change and proportions, the Probability Calculator for event likelihood, or the Average Calculator for means and weighted averages.