How to Calculate Your Ideal Calorie Intake

Understanding Calorie Needs

Your body burns calories around the clock — even while sleeping. The total number of calories you burn daily is called your Total Daily Energy Expenditure (TDEE), and understanding it is the foundation of any nutrition plan.

TDEE consists of three main components: your Basal Metabolic Rate (BMR) which accounts for 60–70% of daily calorie burn, the thermic effect of food (about 10%), and physical activity (20–30%).

The Mifflin-St Jeor Equation

The most accurate widely-used formula for calculating BMR is the Mifflin-St Jeor equation, developed in 1990:

• Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 5
• Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

After calculating BMR, multiply by an activity factor: 1.2 for sedentary lifestyles up to 1.9 for extremely active individuals.

Setting Your Target

For weight loss, eat 300–500 calories below your TDEE. This creates a deficit that leads to approximately 0.5–1 pound of fat loss per week — a sustainable, healthy rate.

For muscle gain, eat 250–500 calories above TDEE while strength training. This surplus provides the energy needed to build new muscle tissue.

For maintenance, eat at your TDEE. Track your weight for 2–3 weeks and adjust if your weight trends up or down.

Common Mistakes

The biggest error is overestimating activity level. Most people with desk jobs are sedentary even if they exercise 3–4 times per week. Be conservative with your activity multiplier and adjust based on real results.

Another common mistake is cutting calories too aggressively. Eating below 1,200 calories (women) or 1,500 calories (men) can trigger metabolic adaptation, where your body reduces calorie burn to conserve energy.

Try It Yourself

Use our Calorie Calculator to find your personalized daily calorie target based on your age, weight, height, and activity level. Pair it with our TDEE Calculator for a complete macro breakdown.