CalorieCalc

    About CalorieCalc

    CalorieCalc is a free, open-access tool designed to help you estimate your daily calorie needs based on well-established nutrition science. Whether you are looking to lose weight, maintain your current weight, or build muscle, understanding your calorie requirements is the essential first step in any nutrition plan.

    What We Provide

    Our calculator estimates your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE), then adjusts for your specific weight goal. We also provide a macronutrient breakdown showing how to split your calories between protein, carbohydrates, and fat based on popular and evidence-based ratio presets.

    In addition to the calculator, we publish in-depth guides covering topics like TDEE calculation, calorie deficits, macronutrient ratios, calorie counting for beginners, and exercise calorie burn. We also provide worked scenarios showing how different people — from sedentary office workers to active gym-goers to new mothers — can use the calculator for their specific situation.

    Methodology & Data Sources

    The calculator implements two scientifically validated BMR equations:

    • Mifflin-St Jeor Equation (1990): Recommended by the Academy of Nutrition and Dietetics as the most accurate BMR prediction equation for the general population. Published by Mifflin et al. in the American Journal of Clinical Nutrition.
    • Harris-Benedict Equation (Revised 1984): Originally published in 1919 by Harris and Benedict, revised by Roza and Shizgal in 1984. One of the most widely used BMR equations in clinical practice.

    Activity multipliers are based on the Katch-McArdle activity factor scale, widely used in exercise science and nutrition planning. Goal-based calorie adjustments follow the established principle that approximately 7,700 calories equates to one kilogram of body fat.

    Privacy & Data Handling

    We take your privacy seriously. All calculations are performed entirely in your web browser using client-side JavaScript. No personal data — including your age, weight, height, or calculation results — is ever sent to or stored on our servers.

    Your calculator inputs are saved locally on your device using your browser's local storage feature, allowing you to return to your previous calculations. This data is stored only on your device and can be cleared at any time through your browser settings.

    We use Google Analytics to understand site traffic and usage patterns (such as which pages are visited most frequently). This does not include any of your personal health data or calculator inputs. We also display advertisements through Google AdSense to support the continued operation and development of this free tool.

    For more details, please read our Privacy Policy.

    Important Disclaimer

    This calculator and all associated content are provided for informational purposes only. The results are estimates based on generalised formulas and do not constitute professional dietary, medical, or nutritional advice.

    Individual calorie needs can vary significantly based on factors not captured by these formulas, including medical conditions, medications, metabolic rate variations, body composition, and genetic factors. The calculator does not account for specific conditions such as pregnancy, breastfeeding, eating disorders, thyroid conditions, or diabetes.

    Always consult a qualified healthcare professional, registered dietitian, or doctor before making significant changes to your diet or exercise routine. This is especially important if you have any existing medical conditions or are taking medications that may affect your metabolism or nutritional needs.

    Contact

    If you have questions, spot an error, or want to get in touch, please use our contact form. We aim to respond to all enquiries within a few business days.