Unit Converters: Grams to Calories & Calories to Pounds Converter
Convert grams of protein, carbs, and fat directly into calories, calculate calories to pounds of fat loss, or convert kilojoules (kJ) to kilocalories (kcal).
🔄 Interactive Grams to Calories & Calories to Pounds Converter
About this Calculator
Methodology & Formulas: This Unit Converters calculator uses standard physiological formulas and evidence-based guidelines to provide accurate estimates.
Reviewed by: Dr. Rekha Kumar, M.D., M.S., Lead Medical Reviewer
Last Updated: August 2026
Sources & Citations: Guidelines from the NIH and CDC were consulted in the creation of this tool.
Disclaimer: This tool is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider.
Frequently Asked Questions
How many calories are in 1 gram of protein, carb, and fat?
1 gram of Protein = 4 kcal | 1 gram of Carbohydrate = 4 kcal | 1 gram of Fat = 9 kcal | 1 gram of Alcohol = 7 kcal.
How many calories equal 1 pound of body fat?
Scientifically, 1 pound of human adipose tissue contains approximately 3,500 kcal of energy.
How do you convert Kilojoules (kJ) to Calories (kcal)?
1 Kilocalorie (kcal) = 4.184 Kilojoules (kJ). To convert kJ to kcal, divide the kJ value by 4.184.
Scientific References & Clinical Guidelines
- CDC Healthy Weight Guidelines - Centers for Disease Control and Prevention
- NIH National Heart, Lung, and Blood Institute (NHLBI) Obesity Guidelines
- PubMed studies on rate of fat mass vs. lean mass loss