Pot odds
Pot odds compare the size of the pot with the amount you have to call, and tell you how often you need to win.
If the pot is 9 bb after a bet and you must call 3 bb, you are getting 3 to 1. The equity you need is the call divided by the pot after your call: 3 / 12 = 25%.
When your equity against the betting range is higher than that, calling makes money at showdown. When it is lower, the call loses unless later streets make up the difference.
Work it out
Pot odds calculator: Enter the pot and the bet you face. The calculator shows the odds you are getting and how often you need to win for a call to break even.
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Practise decisions like this in the trainer: ten hands at a time, with the answer and the reason.