Calorie & TDEE Calculator
Calculate your daily calorie needs based on your personal stats, activity level, and goals.
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Daily Calorie Targets
Macronutrient Breakdown
About Calorie & TDEE Calculator
Understanding how many calories your body needs each day is fundamental to managing your weight and overall health. This calorie calculator uses the Mifflin-St Jeor equation, widely regarded as the most accurate formula for estimating Basal Metabolic Rate (BMR). Your BMR represents the number of calories your body burns at complete rest just to maintain basic life functions like breathing, circulation, and cell production.
Your Total Daily Energy Expenditure (TDEE) takes your BMR a step further by factoring in your daily physical activity level. TDEE is calculated by multiplying your BMR by an activity multiplier that ranges from 1.2 (sedentary) to 1.9 (extremely active). This gives you a realistic picture of how many calories you actually burn in a typical day, including all movement and exercise.
Once you know your TDEE, you can set appropriate calorie targets based on your goals. To lose weight, you need to consume fewer calories than your TDEE, creating a caloric deficit. A safe and sustainable rate of weight loss is typically 0.25 to 0.5 kg (0.5 to 1 lb) per week, which corresponds to a daily deficit of 250 to 500 calories. To gain weight, you need a caloric surplus, eating more than your TDEE. For muscle building, a moderate surplus of 250 to 500 calories daily is generally recommended.
The macronutrient breakdown provided uses a balanced ratio of 30% protein, 40% carbohydrates, and 30% fat. Protein is essential for muscle repair and satiety, carbohydrates fuel your workouts and daily activities, and healthy fats support hormone production and nutrient absorption. This ratio can be adjusted based on individual preferences, dietary restrictions, or specific fitness goals. Athletes and those doing heavy resistance training may benefit from higher protein intake, while endurance athletes may need more carbohydrates.
This tool is suitable for adults aged 15 and older who want to estimate their calorie needs. It is a starting point, not a medical prescription. Individual needs may vary based on genetics, body composition, medical conditions, and other factors. For personalized nutrition advice, consult a registered dietitian or healthcare professional.
FAQ
Q: What is the difference between BMR and TDEE?
A: BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest to maintain vital functions. TDEE (Total Daily Energy Expenditure) includes your BMR plus all the calories you burn through daily activity and exercise. TDEE is always higher than BMR and is the more practical number for setting calorie goals.
Q: How accurate is this calculator?
A: The Mifflin-St Jeor equation used here is considered the most reliable predictive formula, accurate to within about 10% for most people. However, individual variations in metabolism, muscle mass, genetics, and hormones can affect actual calorie needs. Use the results as a starting point and adjust based on your real-world results over 2-4 weeks.
Q: What formula does this calculator use?
A: This calculator uses the Mifflin-St Jeor equation: For men, BMR = 10 x weight (kg) + 6.25 x height (cm) - 5 x age + 5. For women, BMR = 10 x weight (kg) + 6.25 x height (cm) - 5 x age - 161. The TDEE is then calculated by multiplying the BMR by an activity factor (1.2 to 1.9).
Q: How should I choose my activity level?
A: Be honest about your typical week. Sedentary means desk job with no exercise. Lightly active includes casual walking or light workouts 1-3 times per week. Moderately active means structured exercise 3-5 days per week. Very active covers intense training most days. Extra active is for people with physically demanding jobs combined with hard training. When in doubt, choose a lower level to avoid overestimating.
Q: Is this calculator suitable for everyone?
A: This calculator is designed for healthy adults aged 15 and older. It may not be accurate for pregnant or breastfeeding women, competitive athletes with very high muscle mass, individuals with certain medical conditions, or children under 15. Always consult a healthcare professional for specific dietary guidance.