It depends on what you define as a serving. Here are some examples:
OLD/REGULAR POTATOES (without butter)
- 118 calories in 1 small size 2½" diameter boiled potato
- 144 calories in 1 medium size 3" diameter boiled potato
- 258 calories in a large size 4" diameter boiled potato
NEW POTATOES (without buttter)
- 21 calories in each ounce or 28g of boiled new potato
- 75 calories in 3½ ounces or 100g of boiled new potatoes
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