Strength of Schedule Calculator

Strength of Schedule (SOS) is a metric that measures how difficult a team's schedule is based on the quality of their opponents. A higher SOS value indicates tougher opponents, while a lower value means an easier schedule. It is widely used in college sports to compare teams that may not have played each other directly.

This calculator uses the standard NCAA formula: SOS = [2 × (Opponents' Win%) + (Opponents' Opponents' Win%)] / 3. Opponents' win percentage is weighted at 2/3 and opponents' opponents' win percentage at 1/3. This formula is also expressed as SOS = (2 × OR + OOR) / 3.

A strong SOS score (closer to 1.0) means your opponents collectively have winning records and those opponents also faced tough competition. Conversely, an SOS near 0 means your opponents had losing records against weak competition. Most competitive schedules fall in the 0.450–0.600 range.

OR (Opponents' Record) is the combined win-loss percentage of all teams on your schedule. OOR (Opponents' Opponents' Record) is the combined win-loss percentage of every team those opponents played. OOR adds a second layer of depth to ensure that even if opponents are good, the quality of competition they faced is also considered.

The NCAA's official SOS formula is the most widely adopted standard for college sports. Other systems such as the Sagarin Ratings, Massey Ratings, and custom Elo-based models exist for professional leagues. For fantasy football applications, positional matchup ratings (like those used by The Huddle) adjust SOS by position rather than team record.

Selection committees use SOS to differentiate teams with similar records. A team with a 9-3 record against a tough SOS is often rated higher than a 10-2 team that played easy opponents. In college football, the College Football Playoff committee explicitly considers strength of schedule when ranking teams.

Yes. For fantasy football, you can input the defensive rankings or win-loss records of the teams your players face each week. A high SOS means your fantasy players are facing tougher defenses, while a low SOS suggests favorable matchups ahead. Some fantasy platforms adjust this further by position.

An SOS above 0.500 means your opponents collectively have a winning record — i.e., they win more games than they lose. This is generally considered an above-average strength of schedule. Scores below 0.500 indicate opponents with losing records, meaning the schedule is considered easier than average.