Every betting line has a probability hidden inside it. Convert odds to probability and compare to your own estimate to find value bets.
Minus odds: divide odds by (odds + 100). So -110 = 110/210 = 52.4%.
Plus odds: divide 100 by (odds + 100). So +150 = 100/250 = 40%.
Quick reference: -110 = 52.4%, -150 = 60%, +130 = 43.5%, +200 = 33.3%.
If a team is priced at +150 (40% implied) but you believe they have a 55% chance of winning — that's a value bet. You're getting paid more than the risk warrants.
When your estimated probability is higher than what the line implies, you've found value. That's the foundation of sharp betting.