Guides
Short explanations of how betting prices work. More are added through the season.
How to read American odds
-110, +150, -250: what they mean and what they pay.
Implied probability and the vig
Odds as chances, the sportsbook's margin, and fair prices.
How point spreads work
Reading -6.5 and +6.5, pushes, and why spreads sit at -110.
Over/under totals explained
Betting the combined score, what moves a total, and pushes.
Parlay math
How payouts are calculated and why the margin adds up with every leg.