I suggest you refer to the calorie list on your cereal and compare it with your daily calories.
A simple algorithm for basic calorie metabolism of human body
Female: basic calories = weight (kg) x 9
Man: Basic calories (calories) = weight (kg) x 10.
Accurate algorithm of basic heat
female
Age formula
18- 30 years old 14.6 x body weight (kg) +450
3 1- 60 years old 8.6 x weight (kg) +830
Over 60 years old, 10.4 x body weight (kg) +600
man
18- 30 years old 15.2 x body weight (kg) +680
3 1- 60 years old 1 1.5 x body weight (kg) +830
Over 60 years old 13.4 x body weight (kg) +490