Conversion table
| Grams (g) | Calories (kcal) |
|---|---|
| 10 g | 40 |
| 25 g | 100 |
| 50 g | 200 |
| 100 g | 400 |
| 150 g | 600 |
| 200 g | 800 |
| 250 g | 1000 |
| 500 g | 2000 |
How to convert Grams to Calories
kcal = grams × (kcal per gram)carbs/protein = 4 · fat = 9 · alcohol = 7 · reverse: grams = kcal ÷ that value
- grams
- grams of the nutrient
- kcal
- the food energy in calories
- kcal per gram
- 4 for carbs and protein, 9 for fat, 7 for alcohol
These are the standard Atwater values used on nutrition labels. A real food mixes macros, so add up carbs, protein and fat separately for its total, or read the label.
Frequently asked questions
How many calories are in a gram of fat?
About 9 kcal, more than double the 4 kcal in a gram of carbohydrate or protein.
How many calories is 100 grams of carbs?
Roughly 400 kcal, since carbohydrate provides about 4 kcal per gram.
How many calories per gram of protein?
About 4 kcal, the same as carbohydrate.
Is this exact for a specific food?
No. It estimates from one macronutrient. A real food combines carbs, protein and fat, so use the label for its true total.