That depends on the thickness (weight) of the slices. For examples of the calories in avocado by size, weight, or cup measurement, see the page link, further down this page, listed under Sources and...
Avocados contain MUFAs (mono-unsaturated fatty acids). These are also known as "good fats". They help you body, and are different than the "bad fats" found in sugar and candy and chocolate and fried...