How to Calculate Your Daily Calorie Needs for Weight Loss, Maintenance, or Muscle Gain

Understanding your daily calorie needs is the foundation of any nutrition plan. Whether you want to lose weight, maintain your current physique, or build muscle, knowing exactly how many calories your body needs each day is essential. The number depends on several factors: your age, gender, weight, height, activity level, and fitness goals.

Use the Calorie Calculator at Today Calculator to get your personalized daily calorie target based on your unique metrics.

Step 1: Calculate Your BMR

Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest — just to keep your heart beating, lungs breathing, and cells functioning. The Mifflin-St Jeor equation is the most accurate formula:

Gender	Formula	Example (30 yr, 70 kg, 175 cm)
Male	10 × weight(kg) + 6.25 × height(cm) – 5 × age(y) + 5	10(70) + 6.25(175) – 5(30) + 5 = 1,639 cal
Female	10 × weight(kg) + 6.25 × height(cm) – 5 × age(y) – 161	10(70) + 6.25(175) – 5(30) – 161 = 1,473 cal

The Calorie Calculator computes your BMR instantly. Just enter your weight, height, age, and gender.

Step 2: Apply Your Activity Multiplier

Once you have your BMR, multiply it by your activity level to get your Total Daily Energy Expenditure (TDEE):

Activity Level	Description	Multiplier
Sedentary	Desk job, little exercise	1.2
Lightly Active	1–3 days/week light exercise	1.375
Moderately Active	3–5 days/week moderate exercise	1.55
Very Active	6–7 days/week intense exercise	1.725
Extra Active	Physical job + daily training	1.9

Example: If your BMR is 1,639 and you exercise 4 days a week (moderately active), your TDEE = 1,639 × 1.55 = 2,540 calories per day. This is what you need to maintain your current weight.

Step 3: Adjust for Your Goal

• Weight Loss: Subtract 300–500 calories from your TDEE (lose ~0.5 kg/week)
• Weight Maintenance: Eat at your TDEE
• Muscle Gain: Add 200–300 calories above your TDEE

Using the example above: to lose weight, eat 2,040–2,240 calories/day. To build muscle, eat 2,740–2,840 calories/day.

Common Mistakes

• Overestimating activity level: Most people overestimate how active they are. Be honest with your multiplier.
• Not recalculating after weight loss: As you lose weight, your BMR decreases. Recalculate every 5–10 kg lost.
• Ignoring macros: Calories matter for weight, but protein, carbs, and fat ratios matter for body composition.

Get your exact numbers with the Calorie Calculator and start your nutrition plan on solid data, not guesswork.