Calorie Calculator
Calculate daily calorie needs and macros
TDEE calculation
Macro breakdown
Goal-based calories
Meal split suggestions
You want to lose weight. Or gain muscle. Or just stop feeling tired all the time. Everyone says "eat less" or "eat more" but what does that actually mean in numbers? How many calories should you eat—specifically—to reach your goal?
This calculator computes your Total Daily Energy Expenditure (TDEE) based on your body and activity level, then provides calorie targets for weight loss, maintenance, or muscle gain. Finally, evidence-based numbers instead of guesswork.
What is a Calorie Calculator?
A calorie calculator estimates your daily energy needs based on personal factors (age, gender, height, weight) and activity level. It calculates your Basal Metabolic Rate (BMR)—calories burned at rest—then multiplies by an activity factor to get TDEE.
The calculation:
BMR (Mifflin-St Jeor):
Men: (10 Ă— weight kg) + (6.25 Ă— height cm) - (5 Ă— age) + 5
Women: (10 Ă— weight kg) + (6.25 Ă— height cm) - (5 Ă— age) - 161
TDEE = BMR Ă— Activity Multiplier (1.2 to 1.9)
Eat at TDEE and your weight stays stable. Eat below for fat loss. Eat above for muscle gain. All sustainable changes start with knowing this number.
Why People Actually Need This Tool
Regardless of diet type—keto, vegan, paleo—weight change comes down to calories in vs calories out. You can't manage what you don't measure.
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Weight loss planning — Calculate deficit needed to lose weight sustainably.
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Muscle building — Know how much to eat for lean mass gain.
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Maintenance tracking — Stop unintentional weight drift.
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Athletic performance — Fuel training properly.
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Recovery from restriction — Know appropriate intake for metabolic health.
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Meal planning — Budget daily calories across meals.
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Progress troubleshooting — Understand why weight isn't changing.
How to Use the Calorie Calculator
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Enter body stats — Age, gender, height, weight.
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Select activity level — From sedentary to very active.
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Choose your goal — Lose weight, maintain, or gain muscle.
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View results — TDEE and goal-specific calories.
| Activity Level | Description | Multiplier | Example |
|---|---|---|---|
| Sedentary | Desk job, little exercise | 1.2 | Office worker, no gym |
| Light | Light exercise 1-3 days/week | 1.375 | Walking, occasional workouts |
| Moderate | Moderate exercise 3-5 days/week | 1.55 | Regular gym sessions |
| Active | Hard exercise 6-7 days/week | 1.725 | Daily training |
| Very Active | Physical job + hard exercise | 1.9 | Construction worker who trains |
Most people overestimate their activity level. If unsure, choose one level lower. An extra gym session doesn't make you "very active."
Real-World Use Cases
1. The Weight Loss Start
Context: 35-year-old woman, 170 lbs, wants to lose 20 lbs.
Problem: Has tried many diets without lasting success.
Solution: Calculate TDEE: 1,950 calories. Target deficit: 1,450-1,550 calories for 1 lb/week loss.
Outcome: Clear, sustainable target. No starvation diets. Steady progress.
2. The Muscle Building Phase
Context: 25-year-old man, 160 lbs, lifting 5 days/week, wants to gain muscle.
Problem: Not gaining despite heavy training.
Solution: TDEE: 2,600 calories. Surplus target: 2,850-3,000 calories.
Outcome: Adequate fuel for muscle growth. Gains resume.
3. The Plateau Breakthrough
Context: Person stuck at same weight for 6 weeks despite "dieting."
Problem: Weight loss stopped. Frustration increasing.
Solution: Calculate actual TDEE. Discover they're eating at maintenance, not deficit.
Outcome: Adjusted intake. Weight loss resumes.
4. The Athletic Performance
Context: Marathon runner training 50 miles/week.
Problem: Feeling fatigued, performance declining.
Solution: Calculate TDEE: 3,200 calories. Was eating only 2,000.
Outcome: Increased intake. Energy and performance improve.
5. The Post-Diet Recovery
Context: Person finished aggressive diet, scared to eat more.
Problem: Eating 1,200 calories with low energy and hormonal issues.
Solution: Calculate maintenance TDEE: 1,800 calories. Plan gradual reverse diet.
Outcome: Metabolic health improves. Sustainable eating restored.
6. The New Parent Reality
Context: New mother wanting to lose baby weight while breastfeeding.
Problem: Needs adequate calories for milk production but wants weight loss.
Solution: TDEE + 300-500 for breastfeeding. Modest 300-calorie deficit from that total.
Outcome: Gradual weight loss without compromising milk supply.
7. The Body Recomposition
Context: Average physique person wanting to lose fat and gain muscle simultaneously.
Problem: Conflicting advice about surplus vs deficit.
Solution: Eat at maintenance TDEE with high protein (0.8-1g per lb). Focus on strength training.
Outcome: Slow but steady body composition improvement.
Common Mistakes and How to Avoid Them
These formulas estimate average metabolism. Individual variation of ±15% is normal. Adjust based on actual results over 2-4 weeks.
Privacy and Data Handling
This Calorie Calculator operates entirely in your browser.
- No body measurements are sent to any server.
- No health data is stored.
- No account required.
- Works completely offline.
Your personal health information stays private.
Conclusion
Sustainable weight management requires knowing your numbers. Not vague advice to "eat less" but specific calorie targets based on your body, activity, and goals.
This calculator gives you those numbers. Your maintenance calories. Your deficit for loss. Your surplus for gain. Combined with consistency and patience, these targets produce results.
Stop guessing. Start calculating. Then start seeing progress.