Calories. According to the nutrition information from MyFitnessPal, each 1/2 cup serving of butter beans contains 90 calories. If you base your daily calorie intake on the suggested level of 2,000 calories, then one serving of butter beans provides 4.5 percent of your daily intake.The calorie expenditure information at MayoClinic.com indicates you could burn off those calories through about half an hour of walking at a 2 mph pace.f you base your daily calorie intake on the suggested level of 2,000 calories, then one serving of butter beans provides 4.5 percent of your daily intake. The calorie expenditure information at MayoClinic.com indicates you could burn off those calories through about half an hour of walking at a 2 mph pace.