There are approximately 35 calories in a medium-sized clementine orange. The vitamin C included in one clementine is approximately 60 percent of the daily recommended value of the vitamin.
Clementines are high in sugar, with 6.8 grams per serving, as well as fiber with 1.3 grams or 5 percent of the daily recommended value. A clementine is a small source of protein with 0.6 grams per serving, and contains a minimal amount of fat with 0.1 gram per serving. One clementine contains 131 milligrams of potassium and no cholesterol. Clementines also contain a small amount of calcium and iron, and are low in sodium.