Calorie Calculator

Calculate your exact daily calorie needs, BMR, and TDEE based on your body metrics and activity level. Discover personalized macronutrient breakdowns for weight loss, maintenance, or muscle gain.

Your Parameters

Live calculation
ages: 10 - 120
Gender
e.g. 175 cm
cm
e.g. 70 kg
kg
Daily Calorie Target
2,556kcal / day
StrategyWeight Maintenance
BMR: 1649 kcalTarget: 2556 kcalTDEE: 2556 kcal
Basal Metabolic RateMaintenance Energy

Optimal Macronutrient Breakdown

Interactive daily energy ratio (Protein, Carbs, Fats)

Hover Slices
2556Total kcal
Protein

126g

20% • 504 kcal

Carbs

353g

55% • 1413 kcal

Fats

71g

25% • 639 kcal

Meal Timing Split

Breakfast (25%)639 kcal
Lunch (35%)894 kcal
Dinner (30%)767 kcal
Snacks (10%)256 kcal

Weight Trajectory

kg
In 4 Weeks70.0 kg
In 8 Weeks70.0 kg
In 12 Weeks70.0 kg

Consuming ~2556 kcal/day matches your total daily energy expenditure (TDEE) to maintain current weight.

Individual metabolic rates vary. Monitor your weight weekly and adjust intake by 100–150 kcal as needed.

Understanding Your Daily Caloric Energy Needs

Calories are the primary unit of measurement for nutritional energy. Every physiological process in the human body—from myocardial contraction and neurotransmitter synthesis to cellular mitosis and physical locomotion—demands continuous biochemical energy derived from food intake.

Calculating your daily calorie requirements allows you to accurately calibrate your nutrition to achieve specific body composition objectives: fat loss, lean muscle hypertrophy, athletic conditioning, or weight maintenance. This calculator employs the clinically validated Mifflin-St Jeor equation, acknowledged by the Academy of Nutrition and Dietetics as the gold-standard metabolic estimation algorithm.

1. Basal Metabolic Rate (Mifflin-St Jeor Equation)
Men:BMR = (10 × Weight in kg) + (6.25 × Height in cm) - (5 × Age in yrs) + 5
Women:BMR = (10 × Weight in kg) + (6.25 × Height in cm) - (5 × Age in yrs) - 161
2. Total Daily Energy Expenditure (TDEE) & Goal Adjustment
TDEE = BMR × Physical Activity Factor (1.20 to 1.90)
Target Daily Intake = TDEE ± Caloric Goal Offset (e.g. -500 kcal for 0.5 kg/wk fat loss)
Step-by-Step Calculation Breakdown
Step 1: Calculate Resting Basal Metabolism (Male, 30 yrs, 70 kg, 175 cm)
BMR=(10 × 70) + (6.25 × 175) - (5 × 30) + 5=700 + 1,093.75 - 150 + 5=1,649 kcal/day
Step 2: Scale by Weekly Physical Activity (Moderate Exercise: ×1.55)
TDEE=1,649 kcal × 1.55=2,556 kcal/day
Step 3: Calculate Caloric Deficit Target for Steady Fat Loss (-500 kcal/day)
Target Intake=2,556 - 500=2,056 kcal/day (~0.5 kg loss/wk)

Macronutrient Energy Density & Thermic Effect Comparison

While net energy balance governs overall weight change, the macronutrient composition of your diet dictates whether lost weight comes from adipose tissue or lean muscle mass.

MacronutrientEnergy DensityThermic Effect of Food (TEF)Optimal Dietary Purpose
Protein4 kcal / gram20% – 30%Preserves lean tissue during deficits; highest satiety per calorie
Carbohydrates4 kcal / gram5% – 10%Replenishes muscle glycogen; fuels anaerobic training and central nervous system
Dietary Fats9 kcal / gram0% – 3%Maintains testosterone/estrogen synthesis and fat-soluble vitamin (A, D, E, K) uptake

Safe and Sustainable Energy Balance Principles

  • Avoid Severe Crash Deficits: Restricting calories below your base BMR triggers adaptive thermogenesis (metabolic slowing) and elevates cortisol and ghrelin (hunger hormone).
  • Resistance Training Is Essential: Without strength stimulus, up to 25% of weight lost during a deficit can originate from functional skeletal muscle rather than body fat.
  • Protein Target Guidelines: When in a caloric deficit, maintain 1.6 to 2.2 grams of protein per kilogram of body weight (0.8–1.0 g/lb) to maximize nitrogen balance and muscle retention.

Frequently Asked Questions

How are daily calorie needs calculated?
Your daily calorie needs are calculated using the Mifflin-St Jeor equation, which determines your Basal Metabolic Rate (BMR) based on age, gender, height, and weight. This BMR is then multiplied by an activity factor to get your Total Daily Energy Expenditure (TDEE). The Mifflin-St Jeor equation is considered the most accurate for most people according to the American Dietetic Association.
What is TDEE and why does it matter?
TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a day, including all activities. It combines your BMR (calories burned at rest) with calories burned through physical activity. Knowing your TDEE helps you understand how many calories you need to maintain your weight, and from there, you can adjust for weight loss or gain goals.
How many calories should I eat to lose weight?
A safe rate of weight loss is 0.5-1 kg (1-2 lbs) per week, which requires a calorie deficit of 500-1000 calories per day. Most experts recommend starting with a modest deficit of 500 calories below your TDEE. Extreme calorie restriction can slow your metabolism and lead to muscle loss. Always ensure you're eating at least 1,200 calories (women) or 1,500 calories (men) unless supervised by a healthcare provider.
How accurate are calorie calculators?
Calorie calculators provide estimates that are typically within 10% of your actual needs for most people. However, individual variation exists based on genetics, body composition, and other factors. Use the calculated number as a starting point, then adjust based on your actual results over 2-4 weeks. If you're not seeing expected changes, adjust your intake by 100-200 calories.
Should I eat back the calories I burn exercising?
It depends on your goals. If maintaining weight, eating back exercise calories helps prevent unintended weight loss. For weight loss, many experts recommend eating back 50-75% of exercise calories to fuel recovery without eliminating your deficit. Be cautious with estimates from fitness trackers, which often overestimate calories burned. When in doubt, eat slightly less than burned.
What's the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions like breathing, circulation, and cell production while at complete rest. TDEE (Total Daily Energy Expenditure) includes your BMR plus all calories burned through daily activities, exercise, and digestion. Your TDEE is always higher than your BMR.

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