Every time you place a bet the sports book will charge you a fee for brokering the bet. This fee isn’t immediately apparent but you can calculate it using this calculator. Simply input the odds offered on both side of the bet. For example, if you are betting on the Cowboys money line and you can you get -150 that they will win and +180 that they will lose you enter in both of these lines into the calculator and it will tell you that the bet will cost you 4.48%. The best way to increase your sports betting bankroll is to reduce this hold rate as much as possible. You can do this effectively by signing up for multiple sports books and using our very own OddsShopper tool to find the odds offered at multiple sports books. Many of our tools automatically integrate these best odds directly for you!