Calculating Winnings\n\n Odds of 7/5 mean you'll win $7 for every $5 you wager on the A's. Conversely, the Rangers' odds of 5/8 mean you need to wager $8 to win $5 on Texas. Another way to look at it: If the first number is larger than the second, you're betting on the underdog for a higher potential payout.
A good medium is 3% per play. For example, if you're starting with a bankroll of $100, you should risk $3 on every bet. If you're starting with $1000, you should risk $30 on every bet. Your unit size would be $3 or $30, respectively.