McDonald's Coca-Cola (Medium) No Ice Complete Information
A McDonald's Coca-Cola (Medium) carries 270 calories. The live restaurant listings this site verifies against publish no standalone price for this size, so none is shown here rather than invented; the $2.69 Diet Coke (Small) is listed and fountain flavors generally share a price per size.
A medium carries roughly half again the calories of a small Coke at 200, which is the trade for the larger cup. Inside a meal bundle the size upgrade usually costs nothing at the kiosk, which makes ordering a medium the default choice for most people even though the standalone price rises. The fountain setup behind it is the same one the small uses: filtered water, pre chilled syrup and refrigerated lines, which is the documented reason McDonald's cola holds its carbonation better than most. For a zero calorie alternative at the same size, Diet Coke carries 0.
Health Insight
At 270 calories and 70g of sugar, this one is best treated as an occasional order rather than an everyday one.
Lighter alternative: Coffee (Medium) on the same menu comes in at 10 calories. See Coffee (Medium)