A poker calculator is good when reviewing hands. Poker is a game of incomplete information. After the hand, you can put in the hands and see the odds
. A good way to learn, also it helps explain bad beats.
When you really learn the odds, you start to see why LAG is so effective and why these players are so hard to play against.
For example AK vs J10 is close to 60/40. While you think you have someone crushed with AK, you are really just a little better than a coin flip.
Another example is what hand is most likely to crack AA?
How likely are you to hit your flush?
How likely are you to make your open ender?
When you are starting a calculator can be a big help with understanding the inner workings of the math.