Calorie Calculator

Calculate your TDEE and daily macros based on your body stats, activity level, and fitness goal.

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What is TDEE?

TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a single day, accounting for all activity — from breathing and digestion to exercise and daily movement. It represents your complete energy output, and matching your calorie intake to your TDEE is the foundation of any effective nutrition plan.

Understanding your TDEE removes the guesswork from dieting. If you eat fewer calories than your TDEE, you lose weight. Eat more, and you gain. Eat the same, and you maintain. It really is that straightforward — though the quality of those calories matters enormously for health and performance.

TDEE is made up of four components: BMR (your resting metabolism), TEF (the thermic effect of food — calories burned digesting meals), NEAT (non-exercise activity like walking and fidgeting), and EAT (planned exercise). This calculator combines BMR with an activity multiplier to estimate your total daily burn.

How We Calculate Your Calories

We use the Mifflin-St Jeor equation, the most widely validated BMR formula in clinical nutrition research. Unlike the older Harris-Benedict equation, Mifflin-St Jeor consistently shows within 10% accuracy for most people when tested against direct calorimetry measurements.

BMR Formula (Mifflin-St Jeor)

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

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

TDEE: BMR × Activity Multiplier

Your BMR is then multiplied by an activity factor to get TDEE. The activity multipliers range from 1.2 (sedentary) to 1.9 (extremely active). These multipliers were established through decades of metabolic research and represent population averages — individual results may vary by 5–15%.

Understanding Activity Levels

Choosing the right activity level is critical for accuracy. Most people overestimate how active they are. When in doubt, select one level lower and adjust based on results over 2–3 weeks.

Sedentary × 1.2
Desk job with little or no deliberate exercise. Walking only for basic daily tasks. This applies to most office workers who don't have a regular workout routine.
Lightly Active × 1.375
Light exercise 1–3 days per week. Think casual walks, yoga, or light gym sessions a few times a week alongside an otherwise sedentary lifestyle.
Moderately Active × 1.55
Moderate exercise 3–5 days per week. Regular gym sessions, jogging, or sports several times a week. This is the most common level for active individuals.
Very Active × 1.725
Hard exercise or sports 6–7 days per week. Athletes in training, people who do daily intense workouts, or those with physically demanding hobbies.
Extra Active × 1.9
Very hard exercise plus a physical job. Professional athletes, construction workers, or military personnel who exercise daily on top of an active job.

Macronutrient Guide

Macronutrients — protein, carbohydrates, and fat — are the three categories of nutrients that provide calories. Getting the right balance for your goals is just as important as hitting your total calorie target.

Protein 4 kcal/g

The building block of muscle, skin, enzymes, and hormones. Protein is the most satiating macronutrient and has the highest thermic effect (20–30% of its calories are used during digestion). Target 0.7–1.0g per pound of body weight (1.6–2.2g/kg) to preserve or build muscle. Higher protein intake is especially important during calorie deficits to prevent muscle loss.

Carbohydrates 4 kcal/g

Your body's preferred fuel source, especially for high-intensity exercise and brain function. Carbs replenish glycogen stores, support performance, and provide fiber for gut health. Complex carbs (oats, rice, sweet potatoes, vegetables) digest slowly and provide sustained energy, while simple carbs are best reserved for around workouts.

Fat 9 kcal/g

Essential for hormone production, fat-soluble vitamin absorption (A, D, E, K), and cellular health. Never drop fat below 20% of total calories, as this disrupts hormonal function. Prioritize unsaturated fats from olive oil, nuts, avocados, and fatty fish. Limit trans fats and minimize saturated fat intake for cardiovascular health.

Tips for Healthy Weight Management

  • Track for 2 weeks before adjusting. Your body weight fluctuates daily due to water, sodium, and hormones. Use a 7-day average to assess real trends before changing your calorie target.
  • Start with a moderate deficit. A 500 kcal/day deficit produces roughly 0.45 kg (1 lb) of fat loss per week. Aggressive cuts over 1,000 kcal risk muscle loss and metabolic adaptation.
  • Prioritize protein at every meal. Protein keeps you full longer, preserves lean muscle during weight loss, and supports recovery after exercise. Aim for 25–40g of protein per meal.
  • Eat primarily whole foods. Ultra-processed foods are engineered to be hyper-palatable and easy to overeat. Whole foods — vegetables, lean proteins, legumes, whole grains — make it easier to feel full within your calorie budget.
  • Stay hydrated. Thirst is often mistaken for hunger. Drink water before meals and consistently throughout the day. Aim for at least 8 cups (2L) daily, more if you exercise intensely.
  • Sleep 7–9 hours per night. Sleep deprivation disrupts hunger hormones ghrelin and leptin, dramatically increasing appetite and cravings for high-calorie foods. Poor sleep can undermine even a perfect diet.
  • Recalculate every 4–6 weeks. As your body weight changes, your TDEE changes too. Use this calculator regularly to keep your targets accurate and avoid plateaus.

Frequently Asked Questions

How accurate is this TDEE calculator?

The Mifflin-St Jeor equation used here is accurate to within 10% for most people when tested against lab-measured metabolic rates. However, individual metabolic rates can vary due to genetics, hormones, gut microbiome, body composition, and chronic dieting history. Treat your calculated TDEE as a starting point, track your results for 2–3 weeks, and adjust by 100–200 kcal if your weight isn't changing as expected.

What is the difference between BMR and TDEE?

BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest — the energy needed for involuntary functions like breathing, circulation, and cell repair. You would burn this many calories even if you stayed in bed all day. TDEE (Total Daily Energy Expenditure) adds the calories burned through all physical activity on top of BMR. TDEE is the number you should use to plan your diet.

How many calories should I eat to lose weight?

A sustainable rate of fat loss is 0.5–1% of body weight per week. For most people, this means a daily deficit of 300–750 kcal below TDEE. This calculator uses a standard 500 kcal deficit for the "Lose Weight" goal, which typically produces about 0.45 kg (1 lb) of fat loss per week. Never go below 1,200 kcal/day for women or 1,500 kcal/day for men without medical supervision, as very low calorie intakes compromise nutrition, muscle mass, and hormonal health.

How much protein do I need per day?

Current research recommends 1.6–2.2g of protein per kilogram of body weight (0.7–1.0g per pound) for active individuals looking to build or preserve muscle. For weight loss, staying toward the higher end helps prevent muscle breakdown. For sedentary individuals, the minimum daily recommended intake is 0.8g/kg, but this is insufficient for those who exercise regularly. This calculator sets protein at approximately 30% of goal calories as a balanced starting point.

Should I use the metric or imperial system?

Both systems produce the same result — choose whichever you're most comfortable with. The calculator internally converts imperial inputs (pounds and feet/inches) to metric (kg and cm) before applying the Mifflin-St Jeor formula. The conversion is: 1 lb = 0.453592 kg, 1 inch = 2.54 cm. Either way, the accuracy of the calculation is identical.

Why isn't the scale moving even though I'm eating at my TDEE?

Several factors can cause weight to stall: water retention (from sodium, carbs, hormones, or stress), muscle gain offsetting fat loss, inaccurate calorie tracking (studies show people typically underreport intake by 20–50%), metabolic adaptation to long-term dieting, or medical conditions like thyroid issues. If your weight hasn't changed after 2 consistent weeks, reduce calories by 100–150 kcal and reassess. Also, ensure you're weighing yourself consistently — same time, same conditions.

Can I use this calculator if I'm pregnant or have a medical condition?

This calculator provides general estimates for healthy adults. It is not appropriate for pregnant or breastfeeding individuals, children under 10, people with eating disorders, or those with metabolic conditions such as diabetes, thyroid disorders, or kidney disease. If you have any medical condition that affects nutrition or metabolism, please consult a registered dietitian or your healthcare provider for personalized guidance.

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