⚡ Calorie Compass
Precision BMR + TDEE calculator tailored to your goals — free & science-backed (Mifflin-St Jeor + Katch-McArdle)
5% (Athletic)20%50%
Your Personalized Numbers
Basal Metabolic Rate
— kcal
Resting energy needs
Daily Energy Expend.
— kcal
With activity level
Goal Daily Calories
— kcal
Select a goal above
Thermic Effect of Food (TEF)
Calories burned during digestion (higher for protein)Your body burns approximately — kcal per day just digesting food.
Recommended Macros (daily)
—g protein
—g fat
—g carbs
💧 Hydration Recommendation Based on weight, activity & climate (standard climate)
— Liters / day
🚶♂️ Adjust +0.5L per hour of intense exercise or hot climate.
🍽️ Meal Timing & Frequency
— meals per day recommended based on your goal
Example distribution: Breakfast 25% | Lunch 35% | Dinner 30% | Snacks 10%
📅 Week-by-Week Projection
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Week 1
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Week 4
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Week 8
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Week 12
—
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* Estimates assume consistent adherence. Metabolic adaptation may occur.
⚕️ Mifflin-St Jeor & Katch-McArdle (if body fat) | TEF ~10% of total calories. Always consult a professional.
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📚 Essential Tools & Deep Dives
Master your weight loss journey with these expert resources — from beginner guides to advanced metabolic calculators.
Must-Read Guides
Step‑by‑step
📘 How to Use a Free Weight Loss Calculator to Set Realistic Goals (2026 Guide)
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Read the guide Science deep dive🔥 Struggling to Lose Weight? TDEE Explained (And Why You Need to Know It)
90% of dieters fail because they don't understand their true energy expenditure. Learn why TDEE matters more than BMR and how to use it to break plateaus.
Unlock TDEE secrets Hidden factors📉 Beyond the Scale: 5 Things Your Weight Loss Calculator Can't Tell You
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Your calculator says you should be losing — but the scale won't budge. Uncover the 7 most common reasons (portion creep, NEAT decline, metabolic adaptation) and fix them today.
Solve the mystery Gender & metabolism⚡ Do Men Lose Weight Faster Than Women? How Gender Affects Your Calorie Calculator
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Free tools — no signup required. Designed for sustainable, evidence-based weight management.
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How to Use the Calorie Compass (& Why It Works)
How to Use (Step by Step)
1. Select your gender and enter your age, height, and weight.
2. Toggle Advanced Mode if you know your body fat percentage — this activates the more precise Katch‑McArdle formula.
3. Choose your refined activity level (now includes job type + exercise frequency).
4. Pick your goal: maintain weight, lose fat, or gain muscle.
5. Click "Calculate My Calories" — results appear instantly: BMR, TDEE, goal calories, macros, hydration needs, meal timing, TEF (calories burned digesting food), and a week-by-week projection.
Why This Calculator Matters
Generic calorie calculators treat everyone the same. This niche tool accounts for body composition (via body fat %), daily occupation, thermic effect of food, and even hydration. That means athletes, sedentary workers, and people with unique metabolic profiles get personalized numbers — not one-size-fits-all guesses.
The Math Behind It
- Mifflin-St Jeor (default)
Male: (10 × weight kg) + (6.25 × height cm) – (5 × age) + 5
Female: (10 × weight kg) + (6.25 × height cm) – (5 × age) – 161 - Katch-McArdle (advanced mode)
370 + (21.6 × lean body mass kg) — ideal if you know your body fat %. - TDEE = BMR × Activity Factor (1.2 to 1.9)
- Weekly weight change = (daily calorie surplus/deficit × 7) ÷ 7700
(Because 1 kg of body fat ≈ 7700 kcal) - TEF (Thermic Effect of Food) ≈ 10% of calories + extra for protein digestion.
Example: A 30‑year‑old male, 80kg, 180cm, moderate activity → BMR ≈ 1750 kcal, TDEE ≈ 2700 kcal. With a 500‑calorie deficit, weekly fat loss ≈ 0.45 kg.
Frequently Asked Questions
❓ Do I need to use Advanced Mode?
Only if you know your body fat % (e.g., from a smart scale or calipers). Otherwise, Mifflin‑St Jeor works very well for most people.
❓ Why does hydration matter?
Water affects metabolism, hunger control, and physical performance. Our recommendation (35ml/kg + activity adjustment) helps you stay optimally hydrated.
❓ How accurate is the week‑by‑week projection?
It's a reliable estimate based on calorie math. Real results vary with adherence, sleep, and metabolic adaptation. Recalculate every 5 kg lost or gained.
❓ Can I use this for keto or high‑protein diets?
Yes — macros automatically adjust based on your goal (higher protein for fat loss or muscle gain).
❓ Is this calculator free forever?
Absolutely free — no paywalls, no signup required. Use it as often as you like.
Use this calculator weekly to track changes and adjust as your body evolves. Recalculate every 5kg (10lbs) of weight change for best accuracy.
Works on all devices & browsers | Special characters safe (UTF-8) | No white-on-white text
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Scientific References
Peer-Reviewed
Evidence-based formulas: Mifflin-St Jeor & Katch-McArdle
The Calorie Compass algorithm is built on clinically validated predictive equations for resting metabolic rate
1
Validity of predictive equations to estimate RMR in females with varying BMI
2020
Thom G, Gerasimidis K, Rizou E, et al. Journal of Nutritional Science, Cambridge University Press. 2020;9:e17.
📖 Relevance: Validates the Mifflin-St Jeor formula—the primary BMR equation used in this calculator. The study found Mifflin-St Jeor predicted RMR within 10% of measured values in 71% of participants, making it the most accurate among all equations tested.
2
Metabolic adaptation fluctuates with different prediction equations: a secondary analysis based on a weight-loss clinical trial
2025
Frontiers in Nutrition. 2025;12:1543263. NIH/PMC ID: PMC12425712
📖 Relevance: Directly validates the Katch-McArdle formula [RMR = 370 + 21.6 × lean body mass (kg)] used in this calculator's Advanced Mode. The 16-week clinical trial (131 participants) confirms the formula's sensitivity to body composition changes during weight loss.
3
Determining the accuracy of predictive equations for resting metabolic rate in athletes
2025
Faculty of Medicine, Ss. Cyril and Methodius University in Skopje. UKIM Repository, 2025.
📖 Relevance: Evaluated six predictive equations including Mifflin-St Jeor and Katch-McArdle against indirect calorimetry in 90 athletes. Confirms that body composition-based equations (Katch-McArdle and Cunningham) are most accurate for active populations—supporting Advanced Mode for users who know their body fat %.
📐 Mifflin-St Jeor
Default Mode
Male: (10 × kg) + (6.25 × cm) - (5 × age) + 5
Female: (10 × kg) + (6.25 × cm) - (5 × age) - 161
✓ Validated in 71% participants within 10% accuracy
⚡ Katch-McArdle
Advanced Mode
370 + (21.6 × lean body mass kg)
Lean Mass = Weight × (1 - Body Fat % / 100)
✓ Most accurate for athletes & known body composition
⚕️ These peer-reviewed citations provide the scientific foundation for the Calorie Compass algorithm. The calculator is an educational tool and not a medical device. Individual metabolic rates may vary.
📊 Weight loss formula: 1 kg body fat ≈ 7700 kcal | TEF (Thermic Effect of Food) ≈ 10% of calories + protein adjustment