To calculate pot odds quickly at the table, you can use a simple mental math trick. First, count the number of chips in the pot. Then, determine the cost of calling the bet. Next, divide the pot size by the cost of calling to get a rough estimate of your pot odds. For example, if the pot is 100 chips and the bet is 20 chips, your pot odds are approximately 5:1 (100 divided by 20). This quick calculation allows you to make a more informed decision about whether to call, raise, or fold based on the odds.