Calorie Calculator
Find out how many calories you should eat each day to reach your goal — whether that's losing weight, maintaining, or building muscle.
How to use this calculator
Use the sliders to enter your age, height, and weight, then select your typical activity level and your goal. Be honest about activity — most people overestimate. Your personalized calorie target updates instantly. The full goal comparison shows all five targets side by side.
Understanding your calorie targets
Your calorie target is based on your TDEE (Total Daily Energy Expenditure). A 500 calorie per day deficit leads to roughly 1 pound of fat loss per week — this is the standard sustainable rate. A 1,000 calorie deficit (2 lbs/week) is aggressive and harder to sustain. For muscle gain, a smaller surplus (250-500 cal/day) minimizes fat gain while still supporting growth.
Frequently asked questions
How many calories should you eat per day?
Daily calorie needs depend on your basal metabolic rate (BMR) — calories burned at rest — multiplied by your activity level. The table below shows typical TDEE ranges for different body sizes and activity levels. Most sedentary adults need 1,600–2,400 calories to maintain weight.
| Activity level | Women (avg) | Men (avg) | Multiplier |
|---|---|---|---|
| Sedentary (desk job, no exercise) | 1,600–2,000 | 2,000–2,400 | × 1.2 |
| Lightly active (1–2 workouts/week) | 1,800–2,200 | 2,200–2,800 | × 1.375 |
| Moderately active (3–4 workouts/week) | 2,000–2,400 | 2,500–3,100 | × 1.55 |
| Very active (5–6 intense workouts/week) | 2,200–2,800 | 2,800–3,500 | × 1.725 |
| Extremely active (athlete or physical job) | 2,400–3,000 | 3,000–4,000 | × 1.9 |
The science of calorie deficits and surpluses
One pound of fat contains approximately 3,500 calories. A daily deficit of 500 calories therefore leads to roughly 1 lb of fat loss per week — the standard sustainable rate. In practice, the body adapts to prolonged deficits by reducing BMR slightly, which is why weight loss often slows after the first few weeks.
| Goal | Daily adjustment | Expected rate | Notes |
|---|---|---|---|
| Aggressive fat loss | −1,000 cal/day | ~2 lbs/week | Hard to sustain; increases muscle loss risk |
| Fat loss | −500 cal/day | ~1 lb/week | Most recommended approach |
| Slow fat loss | −250 cal/day | ~0.5 lb/week | Easiest to maintain; best muscle retention |
| Maintain | 0 | No change | Eat at your TDEE |
| Lean bulk | +250 cal/day | ~0.5 lb/week | Minimizes fat gain during muscle building |
| Bulk | +500 cal/day | ~1 lb/week | Faster muscle gain, more fat accumulation |
Calories by food goal — what the research says
The optimal calorie intake varies significantly based on your goal and body composition. Eating too little (below 1,200 cal/day for women, 1,500 for men) can trigger metabolic adaptation and muscle loss. Eating too much while bulking leads to excess fat gain. The table below reflects evidence-based ranges.
- ·Protein (4 cal/g) should be prioritized regardless of goal — 0.7–1g per pound of bodyweight preserves and builds muscle
- ·Carbohydrates (4 cal/g) fuel workouts and cognitive function; reduce them for fat loss, not eliminate them
- ·Fat (9 cal/g) supports hormone production; never go below 0.3g/lb bodyweight on a diet
- ·Fiber (25–35g/day) improves satiety, gut health, and blood sugar control without adding significant calories
- ·Alcohol (7 cal/g) provides energy but no nutrients, impairs muscle protein synthesis, and is often underestimated in tracking
Why calorie calculators are estimates
No calculator can predict your exact calorie needs. Individual metabolic rate varies by 10–15% between people of the same age, height, and weight. Gut microbiome, genetics, sleep, stress, and hormones all influence how efficiently you extract and burn calories. Treat your calculated target as a starting point and adjust based on real-world results after 2–3 weeks.