Calorie Needs Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and daily calorie needs using the Mifflin-St Jeor formula and your activity level. For adults aged 18+. For educational use only.
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Understanding Calorie Needs
Basal Metabolic Rate (BMR): The number of calories your body burns at rest. We use the Mifflin-St Jeor equation for accuracy.
TDEE (Total Daily Energy Expenditure): Your BMR multiplied by your activity level factor. This is your maintenance calories.
Activity Level Impact: The more active you are, the more calories you burn. Choose your activity level honestly for accurate results.
Weight Loss Guidelines
Safe Deficit: A 500-calorie daily deficit typically results in 1 lb of weight loss per week, which is considered safe and sustainable.
Minimum Calories: Women should not go below 1200 calories/day and men should not go below 1500 calories/day without medical supervision.
Gradual Approach: Slow, steady weight loss is more likely to be maintained long-term than rapid weight loss.
Weight Gain Guidelines
Calorie Surplus: A 500-calorie daily surplus typically results in 1 lb of weight gain per week.
Muscle vs Fat: Combine your calorie surplus with strength training to maximize muscle gain and minimize fat gain.
Nutrient Dense Foods: Focus on whole foods, lean proteins, complex carbs, and healthy fats rather than empty calories.
Activity Level Definitions
- •Sedentary: Desk job, little to no exercise
- •Lightly Active: Light exercise 1-3 days/week
- •Moderately Active: Moderate exercise 3-5 days/week
- •Very Active: Hard exercise 6-7 days/week
- •Extra Active: Very hard exercise + physical job
Other Calculators
Tracking Your Progress
Consistency is Key: Track your food intake and weight regularly to ensure you're meeting your calorie goals.
Use a Food Diary: Apps like MyFitnessPal or Cronometer can help you track calories and macros accurately.
Weekly Weigh-Ins: Weigh yourself at the same time each week under the same conditions for accurate tracking.
Metabolism & Energy
Metabolic Adaptation: Your metabolism can slow down during prolonged calorie restriction. Take diet breaks if needed.
Energy Balance: Weight management is fundamentally about calories in vs calories out, but food quality matters too.
Individual Variation: These calculations provide estimates. Monitor your results and adjust as needed.
When to Seek Help
- •Not losing/gaining weight as expected
- •History of eating disorders
- •Medical conditions affecting metabolism
- •Pregnant or breastfeeding
- •Need personalized nutrition plan
Calorie Needs Calculator — Common Questions
What is TDEE?
Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns each day, including all physical activity. It is calculated by multiplying your BMR (calories at rest) by an activity factor. Your TDEE is your maintenance calorie level — eating at this number keeps your weight stable.
How many calories should I eat to lose weight?
Eat 300–500 calories below your TDEE per day. This creates a sustainable deficit of roughly 0.3–0.5 kg per week without significant muscle loss. Avoid deficits larger than 700 calories per day — these accelerate muscle breakdown and are harder to sustain. Use our Calorie Deficit Calculator to find your exact daily target and goal timeline.
How accurate is a calorie calculator?
Calculators are estimates — they can be off by 10–20% depending on individual metabolic variation. Use the result as a starting point, track your weight for 2–3 weeks under consistent conditions, and adjust by 100–200 calories per day based on actual results. Your body's response is the most accurate feedback.
Should I eat fewer calories on rest days?
Some people practise calorie cycling with lower intake on rest days, but for most people it is not necessary. Keeping calories consistent is simpler and equally effective. Focus on your weekly average calorie intake rather than hitting a precise number every single day.
How do I know if I am eating the right amount?
Track your weight weekly at the same time of day (morning, after bathroom). If weight is changing at the expected rate of 0.3–0.5 kg per week, your calories are correct. If not, adjust by 100–200 calories per day and reassess after two more weeks.
Why is protein important when cutting calories?
Protein keeps you full, preserves muscle during a calorie deficit, and has the highest thermic effect — your body burns roughly 25% of protein calories just digesting them. Aim for 1.6–2.2 g of protein per kg of body weight per day, especially when in a deficit.
Sources used on this page
TDEE = BMR x activity multiplier. BMR uses Mifflin-St Jeor: Men = 10 x kg + 6.25 x cm - 5 x age + 5; Women = 10 x kg + 6.25 x cm - 5 x age - 161. A deficit of 500 kcal/day produces approximately 0.5 kg (1 lb) per week of weight loss. Results are estimates.
Calorie Deficit Calculator
Find your daily calorie target, deficit size, and timeline to your goal weight.
BMR & TDEE Calculator
Find out how many calories your body burns at rest and daily.
Heart Rate Zone Calculator
Find your target heart rate zones for training and fat burning.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method.