Below is a nice write-up provided by Texas Calculatem that explains the benefits of using a poker odds calculator while playing online Texas Holdem poker. How To Use An Odds Calculator To Win More Money At Online Poker. Do you use a poker odds calculator? Odds calculators are a CRUCIAL part of winning money at online poker. Texas Holdem Odds Calculator uses the Pokersource engine to determine outcomes. Thanks to all who have contributed to this project. Cards are entered in the form 23456789TQKA CDHS and is case insensitive.