Macro calorie calculation

[Maleficent238]

Okay, so I've been pretty religious at logging my calories, protein, carbs, and fat. Here's a problem I've encountered: the total calories is different (usually lower) than the total I get when adding (protein x 4) + (carbs x 4) + (fat x 9). What gives?

[Amanda76]

How big is the difference? If it's pretty big, it probably has to do with insoluable fiber (if the difference = approximately 4 cals/grams of fiber listed under carbs, that's it).

There's also something known as "standard error," that comes from things getting rounded off at different times and things like that...that normally results in a calorie or two difference either way.

[Tiffany_P]

Yup, it's the fiber. These can be subtracted from the carb count.