NFL passer rating looks like a mystery number, but it's just four capped ratios averaged together. Here's the real formula, worked through with an actual draft-week argument.
Batting average alone can hide a worse hitter. Here's how OBP, SLG, and OPS actually work, with a worked example showing why a .250 hitter can outproduce a .300 one.
Bowling scores don't just add up your pins — strikes and spares borrow points from future rolls. Here's the actual USBC scoring math, worked frame by frame.
Your pool pace per 100m almost never survives open water. Here's the real swim pace math, why open water runs slower, and how to set splits you can hit.
Learn how a golf handicap is really calculated under the World Handicap System, with worked examples of the score differential formula and course handicap conversion.