The Calations were a civilization inhabiting Pragine 63, a planet at the edge of Klingon space.
In the mid-23rd century, their civilization was on the brink of starvation, and Starfleet assigned the USS Cabot to offer assistance.
Crewmember Edward Larkin considered using tribbles as a food source for the Calations, but a mishap aboard the ship meant that the civilization had to be evacuated from their planet instead. (ST: "The Trouble with Edward")
This species was only mentioned in dialogue.