Are able to count on one hand - Idioms by The Free Dictionary
be able to count (someone or something) on one hand (redirected from are able to count on one hand)
be able to count (someone or something) on one hand
An expression used to emphasize that something is scarce or lacking. I don't know what classes to sign up for next semester. I could count the number of ones I'm actually interested in on one hand.
be able to count somebody/something on (the fingers of) one ˈhand used to say that the total number of somebody/something is very small: She could count on the fingers of one hand the people she actually enjoyed being with.