MFP % Calculation Error?

Triathlete1502

Hi

Could someone explain how MFP calculate the percentages please?

For instance, how could Fat intake of 64g = 38%?

Please see attached screenshot for the other macro percentages.

Many thanks.

DaddieCat

It's not a 1:1 ratio with grams.

It's based on the number of total calories, and since fats have 9kcal/gr while carbs and protein only have 4...

well, you see where I'm going with that.

Jruzer

It's not calculating percentages based on weight, it's calculating percentages of calories based on Atwater factors:

117 g carbohydrates x 4 kcal/g= 468 kcal
64 g fat x 9 kcal/g = 576 kcal
115 g protein x 4 kcal/g = 460 kcal
Total= 1504 kcal

Fat % = 100 x 576 / 1504 = 38.3%

Ready2Rock206

Of ALL the food you ate today so far 50% of your calories have been carbs, 30% of your calories have been from fat and 20% of your calories have been from protein. As you add more food to your diary during the day the percentages change based on what you've eaten as a whole.

Triathlete1502

Jruzer wrote: »

It's not calculating percentages based on weight, it's calculating percentages of calories based on Atwater factors:

117 g carbohydrates x 4 kcal/g= 468 kcal
64 g fat x 9 kcal/g = 576 kcal
115 g protein x 4 kcal/g = 460 kcal
Total= 1504 kcal

Fat % = 100 x 576 / 1504 = 38.3%

BecomingBane wrote: »

It's not a 1:1 ratio with grams.

It's based on the number of total calories, and since fats have 9kcal/gr while carbs and protein only have 4...

well, you see where I'm going with that.

Thank you so much, Jruzer & BecomingBane for clarifying the concept behind the calculation; it's the first I've heard of the Atwater factor system.

Learnt something new today - many thanks!

Jruzer

Cheers!