How To Calculate Calories off a Food Label

Take a look at the following label:

It says there are 549 calories per 100g

The bar is only 40 grams

So multiply the calories per 100g by .40 (point 40) like this:

549 x .40 = 219 cals

Therefore if you know the 100 grams then you can multiply the amount you eat by using the decimal point – simply move the decimal point as follows:

Lets suppose the food is 50 calories per 100 grams (you will find how many calories are in 100 grams from either the label or online). Then:

if you eat 350 grams you would multiply 100 grams by 3.5
50 cals x 3.5 = 175 cals

if you eat 35 calories you would multiply 100 grams by .35
50 cals x .35 = 17.5 cals

if you eat 200 grams you would multiply 100 grams by 2.0
50 cals x 2.0 = 100 cals

if you eat 455 grams you would multiply 100 grams by 4.55
50 cals x 4.55 = 227 cals

and so on. Do you get the idea?

you read on the label that there are 75 calories per 100g

you eat 125 gms

how many calories did you eat?

ANSWER: 94 CALORIES

(75 cals x 1.25 = 94 cals (actually the answer was 93.75 so I rounded it to 94.)