Calorie Calculator
TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns each day — your Basal Metabolic Rate multiplied by your activity level — and the single most important number for any weight management goal.
Use this calorie calculator to find your TDEE and set a daily calorie target for weight loss, maintenance, or muscle gain. Enter your age, height, weight, and activity level to get your personalized calorie goal with a macro breakdown.
Use this calorie calculator to calculate how many calories you need per day and test different goals instantly — change activity level or target to see the impact in real time.
How Many Calories Do You Need?
Your daily calorie needs depend on your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest — multiplied by an activity factor to account for your lifestyle. This result is your TDEE: Total Daily Energy Expenditure. Your TDEE is the only number that actually controls your weight; eating above it gains weight, eating below it loses weight, and eating at it maintains your current weight.
The Mifflin-St Jeor Formula
This calculator uses the Mifflin-St Jeor equation, the most validated formula for estimating BMR in adults. For men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5. For women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161. Studies show this formula is accurate within 10% for approximately 82% of the non-obese population — more accurate than the older Harris-Benedict equation.
Activity Multipliers Explained
Once BMR is calculated, it's multiplied by an activity factor. Sedentary (desk job, little exercise) = ×1.2; Lightly Active (1–3 exercise days/week) = ×1.375; Moderately Active (3–5 days/week) = ×1.55; Very Active (6–7 days/week) = ×1.725; Extra Active (physical job + hard training) = ×1.9. Most people overestimate their activity level — when in doubt, choose one level lower than you think and adjust based on results.
Setting a Calorie Goal
To lose weight, create a calorie deficit below your TDEE. A 500 cal/day deficit produces about 1 lb of fat loss per week (since 1 lb of fat ≈ 3,500 calories). Losing 2 lbs/week requires a 1,000 cal/day deficit and is generally considered aggressive. Never drop below 1,200 calories (women) or 1,500 calories (men) without medical supervision — severe restriction causes muscle loss and nutrient deficiencies.
Calorie Targets by Goal: Real Numbers
Here's how a 5'8", 170-lb moderately active 35-year-old (TDEE ≈ 2,600 cal) would set calorie goals across different objectives:
| Goal | Daily Calories | vs. TDEE | Expected Rate |
|---|---|---|---|
| Rapid weight loss | 1,600 | −1,000 cal/day | ~2 lbs/week (aggressive) |
| Moderate weight loss | 2,100 | −500 cal/day | ~1 lb/week (sustainable) |
| Slow, muscle-preserving loss | 2,350 | −250 cal/day | ~0.5 lb/week (safest) |
| Maintenance | 2,600 | 0 | Weight stable |
| Lean muscle gain | 2,750 | +150 cal/day | Slow, mostly lean mass |
| Aggressive muscle gain | 3,100 | +500 cal/day | ~1 lb/week (some fat gain) |
Why You Might Not Lose Weight at Your Calculated Deficit
The most common reason is calorie tracking error. Studies consistently show people underestimate their food intake by 20–50% — and overestimate their exercise burn by a similar margin. Restaurant meals often contain 30–50% more calories than estimated. Cooking oils, sauces, and dressings add hundreds of calories invisibly. If the scale isn't moving after 3 weeks, assume your tracking has gaps before assuming the formula is wrong.
The second reason is metabolic adaptation. After 4–8 weeks of consistent deficit, your body reduces TDEE through lower NEAT (non-exercise activity thermogenesis) — you unconsciously sit more, fidget less, and move with less intensity. The fix: recalculate every 10–15 lbs lost, and take a 1–2 week maintenance break every 8–12 weeks of dieting to reset leptin and hunger hormones.
5 Ways to Hit Your Calorie Target Without Tracking Every Bite
- Protein-first at every meal: Protein is the most satiating macro. Aiming for 30–40g per meal naturally crowds out excess calories.
- Eat whole foods 80% of the time: Ultra-processed foods are engineered to override satiety signals; whole foods make overeating harder.
- Pre-plan your two largest meals: Most people eat the same 10–15 meals on rotation — calculate those once and stop tracking the common ones.
- Liquid calories are invisible: Lattes, juices, protein shakes, and alcohol can add 400–600 cal/day without any feeling of fullness.
- Use smaller plates for high-density foods: Calorie density varies enormously — 100g of avocado (160 cal) vs. 100g of cucumber (16 cal). Volume eating with low-density foods helps.
Key Insight: Calorie needs are not static. Every decade of adult life, BMR decreases approximately 2–3% due to muscle loss. A 50-year-old who maintained weight at 2,000 cal/day in their 30s may only need 1,750–1,850 cal to maintain the same weight. The fix is preserving muscle mass through resistance training — which counteracts age-related metabolic decline. Use this calorie calculator annually to recalibrate your targets.
Macronutrient Targets
Hitting your calorie target is the most important factor for weight change, but macros matter for body composition. Protein (4 cal/g) is critical for muscle preservation during a deficit — aim for 0.7–1g per pound of bodyweight. Carbohydrates (4 cal/g) fuel workouts. Fat (9 cal/g) supports hormone production and fat-soluble vitamin absorption. A balanced starting point: 30% protein, 40% carbs, 30% fat. Use our macro calculator to fine-tune your split for your specific goal.
Ready to put your calorie target to work? Read our calorie deficit guide or explore how to set your macros for the full picture.