When hiking you want to bring only what you need, nothing more. The heavier your pack, the harder your hike. So, knowing how many calories you need to replenish will ensure you don't overpack your food stores.
You want to make sure you do replenish your calories, so that you have the energy to finish your hike especially when you have children with you. I found a great website that helps you figure out your calories burned. You can go to hikingscience and enter in your info and it will calculate your calorie expenditure. Here is what it looks like.
|Distance Round Trip (miles):|
|Elevation Gain (ft)|
|Backpack Weight (lbs)|
|Average Grade %|
|Work Ratio relative to Flat Walking|
|Equivalent Number of Flat Miles|
|Base Calories Burned (kcal)|
|Adjusted Calories Burned|
Next time you plan your hike you will know exactly how many calories you need to eat to make sure you keep your energy level up.