If you're planning on eating more at lunch have a lower calorie breakfast. One egg plus one egg white scrambled is just 87 calories. Throw in some frozen spinach for a nutritious meal.
If you're using My Fitness Pal it will calculate the calories per day for you once you add your information, but if not, there are several sites where you can use a calorie calculator: Healthline, Calorie King
Note: DWLZ is a good site to find calories in both food and meals at restaurants.
Example
Breakfast 250
Morning Snack 75
Lunch 350
Afternoon Snack 75
Dinner 450
Evening Snack 75
Total 1275
Try and eat protein and vegetables at every meal and fruit or vegetables for snacks
Breakfast 250
Morning Snack 75
Lunch 350
Afternoon Snack 75
Dinner 450
Evening Snack 75
Total 1275
Try and eat protein and vegetables at every meal and fruit or vegetables for snacks