Grams to Calories Calculator
Convert macronutrient grams to calories and analyze nutritional composition
Macronutrient Input
4 calories per gram
4 calories per gram
9 calories per gram
Calorie Breakdown
Common Food Examples
Apple (medium, 182g)
Chicken Breast (100g)
Avocado (100g)
Beer (12 oz, 5% ABV)
Calorie Content
Nutrition Tips
Fat provides more than double the calories per gram compared to carbs and protein
Alcohol contains 7 calories per gram and provides no essential nutrients
Food labels show total calories and grams of each macronutrient
Understanding calorie sources helps with diet planning and weight management
Quick Reference
Understanding Macronutrients and Calories
What are Calories?
A calorie is a unit of energy. In nutrition, we typically use kilocalories (kcal), which are often simply called "calories" on food labels. One kilocalorie is the amount of energy needed to heat one kilogram of water by one degree Celsius.
Macronutrients Explained
- •Carbohydrates: The body's preferred energy source, found in fruits, grains, and vegetables
- •Protein: Essential for building and repairing tissues, found in meat, dairy, and legumes
- •Fat: Important for hormone production and vitamin absorption, found in oils and nuts
Practical Applications
Weight Management
Understanding calorie content helps you make informed decisions about portion sizes and food choices for maintaining, losing, or gaining weight.
Diet Planning
Knowing the calorie breakdown helps ensure balanced nutrition and appropriate macronutrient ratios for your health goals.
Food Label Reading
This calculator helps you verify the calorie information on food labels and understand how manufacturers calculate total calories.
Example Calculation
A food with 23g carbs, 4g protein, and 9g fat contains:
- • Carbs: 23g × 4 = 92 kcal
- • Protein: 4g × 4 = 16 kcal
- • Fat: 9g × 9 = 81 kcal
- • Total: 189 kcal