Calories in food

jenhenning219

I know that there are
9 cal = 1 gram fat
4 cal = 1g carbs and
4 cal = 1g protein
Wheat I don't understand is how they get the total cal from this information someone please help maybe I am looking at this the wrong way?

lisajsund

Nutrition labels will often be off a little on the total calories due to rounding purposes.
Just take your number of grams of the macros, and multiply those by your numbers. Then add them together.

castlerobber

Not quite sure what you're asking. Is it "how do I calculate calories for a food based on these equivalents?" Or is it "how did they determine that a gram of fat has 9 calories, while a gram of carbohydrate or protein has 4 calories?"

castlerobber

I know that there are
9 cal = 1 gram fat
4 cal = 1g carbs and
4 cal = 1g protein
Wheat I don't understand is how they get the total cal from this information someone please help maybe I am looking at this the wrong way?

I was asking how did they calculate the food cal not how did they get them sorry If it was confusing

I ate a bowl of chili for lunch today. It had 16g carbohydrate, 24g fat, 20g protein.

(16g * 4 cal/g carb) + (24g * 9 cal/g fat) + (20g * 4 cal/g protein) = 64 cal from carb + 216 cal from fat + 80 cal from protein = 360 calories.

It may not match exactly what you see on the nutrition label, because of rounding. Also because fiber, while it's called a carb, provides fewer than 4 cal/gram. Certain types of sweeteners (xylitol, sorbitol, mannitol, lactitol, maltitol) called sugar alcohols also have fewer than 4 cal/gram.

lisajsund

Yeah, fiber makes a difference.
When I calculated my almonds yesterday, it turned out that the label goes off of net carbs.
Net carbs = total carbs - fiber (then multiply that by 4).
My calculation told me the snack bag contained 338 calories. The package said 340.