According to the web site myfoodapedia.gov -- part of the U.S. Department of Agriculture's Center for Nutrition Policy and Promotion -- a 6-ounce cup of black coffee contains just 7 calories. Add some half & half and you'll get 46 calories. If you favor a liquid nondairy creamer, that will set you back 48 calories. A teaspoon of sugar will add about 23 calories.
Coconut milk is the perfect add-in if you’re lactose intolerant, cutting out dairy for dietary purposes (i.e. the Paleo diet), or just want a low-calorie milk substitute. Of course coconut milk adds a light coconut flavor to coffee and lightens up your brew, but it’s also closest in texture to whole milk. You can add vanilla extract to coconut milk to create a homemade, lower calorie creamer. Just be careful and use coconut milk sparingly as it still contains a fair amount of fat. 
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