how many calories does a small sweet potato have
1 74 calories in a 3.5 ounce, or 100g, small serving of sweet mashed potato. 2  126 calories in a 6 ounce, or 170g, larger portion of sweet mashed potato. 3  168 calories in a 8 ounces, or 227g, of sweet mashed potato.  243-249 calories in 1 cup of mashed sweet potato (about 11.6 oz, or 329g)