How many calories are there in a round of white bread with margarine?

I need more information to answer this question accurately. Please tell me:

* What size is the round of white bread? (e.g., is it a small roll, a slice from a loaf, or a whole loaf?)

* How much margarine are you using? (e.g., a teaspoon, a tablespoon, or a pat?)

* What type of margarine is it? (Different brands and types of margarine have varying calorie counts.)

Once you provide this information, I can calculate the approximate calorie count for you.