Select your gender, enter your age, weight, height, choose an activity level, and set your weight goal. The calculator instantly estimates your BMR, total daily energy expenditure (TDEE), and target daily calories, along with suggested protein, carbohydrate, and fat intakes.
Free calorie calculator – no sign‑up
Calculate Your Daily Calorie Needs in Seconds
Discover exactly how many calories you burn each day based on your age, height, weight, and activity level. Plus, adjust your intake to lose, maintain, or gain weight — all free, private, and instant.
Take the Guesswork Out of Your Daily Calorie Needs
Whether you want to lose weight, build muscle, or simply maintain a healthy lifestyle, the foundation is understanding your Total Daily Energy Expenditure (TDEE). This Calorie Calculator uses the Mifflin‑St Jeor equation — widely regarded as the most accurate BMR formula — combined with your activity level to estimate exactly how many calories you burn each day. From there, it provides science‑backed targets for safe weight loss (0.5–1 kg per week) or weight gain. No guesswork, no fad diets — just personalized numbers you can trust, all calculated privately in your browser.
What Is a Calorie Calculator?
A calorie calculator is a free online tool that estimates your daily energy requirements. It first calculates your Basal Metabolic Rate (BMR) — the calories your body needs at complete rest to maintain vital functions. Then it multiplies your BMR by an activity factor (from sedentary to very active) to arrive at your Total Daily Energy Expenditure (TDEE). This TDEE is the number of calories you need to maintain your current weight. The calculator can also suggest a calorie target for weight loss or weight gain by creating a safe daily deficit or surplus. It’s the essential first step in any nutrition or fitness plan, and it’s completely free and private.
How to Use the Calorie Calculator
Enter Your Body Metrics
Input your age, gender, height, and current weight. These are used to compute your BMR.
Select Your Activity Level
Choose the option that best describes your daily routine — from sedentary (desk job) to very active (heavy exercise or physical labor).
View Your Daily Calorie Targets
Instantly see your maintenance calories, BMR, and recommended intake for safe weight loss or weight gain — no sign‑up required.
How the Calorie Calculator Computes Your TDEE
The calculator uses the Mifflin‑St Jeor equation, which is widely considered the most reliable for the general population. For men: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age) + 5. For women: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age) – 161. The TDEE is then BMR × Activity Factor (1.2, 1.375, 1.55, 1.725, or 1.9 based on activity level). Weight loss targets subtract 500 kcal/day for ~0.5 kg/week loss; weight gain targets add 500 kcal/day for ~0.5 kg/week gain. All calculations are performed locally in your browser for complete privacy.
Core Formulas
BMR (M) = 10W + 6.25H – 5A + 5
BMR (F) = 10W + 6.25H – 5A – 161
TDEE = BMR × Activity Factor
W = weight in kg, H = height in cm, A = age in years. Activity factors range from 1.2 to 1.9.
Key Features of This Calorie Calculator
BMR & TDEE Calculations
Uses the Mifflin‑St Jeor equation for a highly accurate resting metabolic rate estimate.
Weight Loss & Gain Targets
Automatically suggests a daily calorie goal for losing or gaining at a safe pace (0.5–1 kg per week).
Five Activity Levels
From sedentary to athlete, you can choose the activity multiplier that best fits your lifestyle.
Private & Secure
All body data stays on your device. Nothing is ever uploaded or shared.
Benefits of Knowing Your Daily Calorie Needs
- ✅ Evidence‑based weight management – eat according to your actual energy requirements instead of guessing
- ✅ Meal planning precision – design a diet that supports your fitness goals without unnecessary restrictions
- ✅ Avoid metabolic slowdown – eating too few calories can lower your BMR; the calculator helps you stay in a healthy range
- ✅ Performance optimization – fuel your body correctly for exercise, recovery, and daily life
- ✅ Long‑term habit building – understanding your calorie budget is the first step toward lifelong healthy eating
How Activity Level Affects Your TDEE
Sedentary (×1.2)
Little to no exercise, desk job. Your TDEE is only slightly above your BMR.
Lightly Active (×1.375)
Light exercise or sports 1–3 days per week. A moderate increase over sedentary.
Moderately Active (×1.55)
Moderate exercise 3–5 days per week. This is a common level for active individuals.
Very Active (×1.725)
Hard exercise 6–7 days per week. Significantly higher calorie needs.
Extra Active (×1.9)
Very hard daily exercise, physical job, or training twice a day. Reserved for elite athletes.
Calories for Weight Loss: Safe and Sustainable
To lose about 0.5 kg (1 pound) per week, a daily deficit of approximately 500 calories is recommended. The calculator subtracts 500 from your maintenance calories to give a weight‑loss target, and if you choose an aggressive approach, it can subtract up to 1000 calories per day (for about 1 kg/week loss). However, it’s generally recommended not to drop below 1,200 calories/day for women or 1,500 for men without medical supervision. The tool displays a warning if the target drops too low, helping you choose a safe path.
BMR vs. TDEE: What’s the Difference?
BMR (Basal Metabolic Rate)
The calories your body needs to survive at complete rest — breathing, circulation, cell production. It accounts for about 60–70% of your daily burn.
TDEE (Total Daily Energy Expenditure)
BMR multiplied by an activity factor. This is the total number of calories you burn in a day, including all movement and exercise.
How Age, Gender, and Muscle Mass Influence Calorie Burn
BMR decreases with age, primarily due to loss of muscle mass. Men generally have a higher BMR than women because they tend to carry more muscle. Even at the same weight and height, a more muscular person will burn more calories at rest. While the calculator doesn’t directly measure body fat percentage, it does account for gender and age in the Mifflin‑St Jeor equation, making it reasonably accurate for most people.
Using the Calculator with Macronutrient Tracking
Once you have your daily calorie target, you can break it down into macronutrients — proteins, carbohydrates, and fats. A common starting point is 40% carbs, 30% protein, and 30% fat, but this varies by goal. The calculator provides the calorie number; you can pair it with a macro split or use one of our other health tools to refine your nutrition plan.
Example Calorie Calculation
Sarah is 30 years old, 5’5″ (165 cm), weighs 150 lbs (68 kg), and exercises moderately 4 times per week. Her BMR (Mifflin‑St Jeor) is approximately 1,440 calories. With a moderate activity factor of 1.55, her TDEE is about 2,232 calories per day. To lose weight at 0.5 kg per week, she would need to eat around 1,732 calories. To gain, she would target around 2,732 calories. The calculator displays these numbers clearly, so Sarah can choose the right target for her goals.
How Often Should You Recalculate Your Calorie Needs?
As you lose or gain weight, your BMR and TDEE change. Recalculate every 5–10 pounds (2–5 kg) of body weight change, or whenever your activity level shifts significantly. The calculator makes it easy to update your numbers and stay on track.
Factors That Influence Daily Calorie Expenditure
- ⚖️ Weight and height
- 📅 Age
- 🚻 Gender
- 🏃 Physical activity level
- 💪 Muscle mass vs. fat
- 🍽️ Diet‑induced thermogenesis
- 🌡️ Climate and temperature
- 🏥 Hormones and health conditions
Detailed Weight‑Loss Scenario
Scenario: Male, 35 years, 5’10” (178 cm), 210 lbs (95 kg), lightly active. Goal: lose 1 lb/week.
- ✅ BMR (Mifflin‑St Jeor): ~1,960 kcal
- ✅ TDEE (×1.375): ~2,695 kcal
- ✅ Weight‑loss target (500 kcal deficit): ~2,195 kcal/day
- ✅ Expected weight loss: ~0.5 kg (1 lb) per week
- ✅ After 12 weeks, recalculate with new weight to adjust intake.
Who Can Use This Calorie Calculator?
- 🏋️ Weight‑loss seekers – find a safe calorie deficit without crash dieting
- 💪 Muscle builders – determine the surplus needed to gain lean mass
- 👩⚕️ Health & wellness coaches – provide clients with science‑based calorie targets
- 🎓 Students & educators – learn the fundamentals of energy balance
- 📋 Anyone curious about their metabolism – understand the numbers behind daily energy needs
Key Nutrition & Metabolism Terms
- BMR (Basal Metabolic Rate)
- The number of calories your body needs at complete rest to sustain life.
- TDEE (Total Daily Energy Expenditure)
- Your BMR multiplied by an activity factor, representing total daily calorie burn.
- Mifflin‑St Jeor Equation
- A widely used formula for estimating BMR, known for its accuracy across diverse populations.
- Calorie Deficit / Surplus
- Eating fewer/more calories than your TDEE to lose/gain weight, respectively.
Tips to Use Your Calorie Target Effectively
- Track your food intake with an app to stay within your daily target.
- Prioritize protein to preserve muscle during weight loss.
- Don’t drop below the safe minimum (1200 kcal for women, 1500 for men) without professional guidance.
- Combine calorie control with regular exercise for best results.
- Recalculate every few weeks as your weight changes.
Advantages of This Calorie Calculator
- ✅ 100% free – no sign‑up, no ads
- ✅ Accurate Mifflin‑St Jeor BMR formula
- ✅ Clear maintenance, loss, and gain targets
- ✅ Five activity levels for precise TDEE
- ✅ Works on any device
- ✅ Private – your body data never leaves your device
Limitations of Calorie Estimates
The calculator provides a starting point based on population formulas. Individual variations in metabolism, muscle mass, and medical conditions can cause actual energy needs to differ. Use the result as a guide and adjust based on your actual weight changes over time. Consult a registered dietitian for a personalized plan.
Accuracy of Results
The Mifflin‑St Jeor equation is considered the most accurate BMR formula for the general population, with a typical error margin of about 10%. The activity multipliers are standard values used in nutrition science.
Security and Privacy
All calculations are performed locally in your browser. No height, weight, age, or personal information is ever transmitted, stored, or shared. You can use the tool offline after the page loads.
Mobile‑Friendly Design
The calorie calculator is fully responsive. Use it on your smartphone, tablet, or desktop — all inputs, charts, and results adapt perfectly to any screen size.
Frequently Asked Questions
How many calories should I eat to lose weight?
A safe starting point is 500 calories below your maintenance TDEE, which yields about 0.5 kg (1 lb) of weight loss per week. The calculator automatically suggests this target based on your metrics.
What is the best BMR formula?
The Mifflin‑St Jeor equation is widely regarded as the most accurate for the general population. It is the formula used by this calculator.
Does muscle really burn more calories than fat?
Yes. Muscle tissue is metabolically more active than fat tissue. Increasing muscle mass through strength training can raise your BMR over time.
Can I use this calculator if I am pregnant or breastfeeding?
This calculator is designed for non‑pregnant, non‑lactating adults. Pregnancy and breastfeeding significantly increase calorie needs; consult your healthcare provider for guidance.
Why does my TDEE change with age?
BMR naturally declines with age, largely due to gradual muscle loss (sarcopenia). Staying active and strength training can help mitigate this decline.
Is my personal data safe?
Absolutely. All calculations are performed locally in your browser. No data is ever sent to a server or stored.
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Conclusion: Fuel Your Body the Smart Way
Understanding your calorie needs is the first step toward any health goal. This calculator gives you the numbers — the rest is up to you. Use it as a starting point, stay consistent, and you’ll see results. Start now and take control of your nutrition today.
Ready to Discover Your Daily Calorie Needs?
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