Calorie Calculator
Estimate your daily calorie needs using Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formulas. Plan for weight loss, maintenance, or muscle gain.
Your Measurements
Understanding Your Calories
BMR (Basal Metabolic Rate) is the calories burned at rest. TDEE (Total Daily Energy Expenditure) = BMR × Activity. Consume less than TDEE to lose weight, more to gain.
| Food | Serving | Calories |
|---|---|---|
| Apple | 1 medium | 95 |
| Banana | 1 medium | 105 |
| Chicken Breast | 3 oz cooked | 140 |
| Brown Rice | 1 cup cooked | 215 |
| Pizza | 1 slice | 285 |
| Beer | 1 can (12 oz) | 154 |
| Activity | 155 lb person |
|---|---|
| Running (6 mph) | ~700 |
| Swimming (moderate) | ~500 |
| Cycling (12-14 mph) | ~560 |
| Walking (3.5 mph) | ~267 |
| Yoga | ~250 |
- Mifflin-St Jeor (Men): BMR = 10×weight(kg) + 6.25×height(cm) - 5×age + 5
- Mifflin-St Jeor (Women): BMR = 10×weight(kg) + 6.25×height(cm) - 5×age - 161
- Revised Harris-Benedict (Men): 88.362 + 13.397W + 4.799H - 5.677A
- Revised Harris-Benedict (Women): 447.593 + 9.247W + 3.098H - 4.330A
- Katch-McArdle: 370 + 21.6 × (lean mass in kg)
Calorie Calculator: Find Your Daily Calorie Needs for Weight Loss, Maintenance & Gain
Introduction
A calorie calculator is your first step toward understanding your body’s energy needs. Whether you want to lose weight, maintain your current weight, or build muscle, knowing exactly how many calories your body requires each day empowers you to make informed decisions.
Based on scientifically validated formulas including Mifflin-St Jeor, Revised Harris-Benedict, and Katch-McArdle, our free calculator provides personalized results based on your age, weight, height, gender, activity level, and even body fat percentage.
What is BMR and TDEE?
BMR (Basal Metabolic Rate)
Your BMR is the number of calories your body burns at complete rest. This includes energy needed for:
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Breathing and circulation
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Cell production and repair
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Temperature regulation
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Brain and organ function
BMR typically accounts for 60-75% of your total daily calorie expenditure.
TDEE (Total Daily Energy Expenditure)
TDEE is your BMR multiplied by an activity factor. It represents the total calories you burn in a day, including:
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Exercise and physical activity
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Daily movement (walking, typing, chores)
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Food digestion (thermic effect of food)
The Three Main Calorie Formulas
1. Mifflin-St Jeor Equation (Most Accurate for 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
Example: A 30-year-old woman, 65 kg, 165 cm
BMR = (10 × 65) + (6.25 × 165) - (5 × 30) - 161 BMR = 650 + 1031.25 - 150 - 161 = 1,370 calories/day
2. Revised Harris-Benedict Equation (Historical Standard)
For Men:
BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age)
For Women:
BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age)
3. Katch-McArdle Formula (Most Accurate if You Know Body Fat %)
This formula accounts for lean body mass, making it more accurate for athletes and muscular individuals.
BMR = 370 + (21.6 × Lean Body Mass in kg)
Where:
Lean Body Mass = Body Weight × (1 - Body Fat Percentage / 100)
Example: 70 kg person with 15% body fat
Lean Mass = 70 × (1 - 0.15) = 59.5 kg BMR = 370 + (21.6 × 59.5) = 370 + 1,285 = 1,655 calories/day
Activity Level Multipliers
Once you have your BMR, multiply it by your activity level to get TDEE:
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Little or no exercise, desk job |
| Lightly active | 1.375 | Light exercise 1-3 days/week |
| Moderately active | 1.55 | Moderate exercise 3-5 days/week |
| Very active | 1.725 | Hard exercise 6-7 days/week |
| Super active | 1.9 | Athlete or physical labor job |
How to Set Your Calorie Goals
| Goal | Calculation | Expected Result |
|---|---|---|
| Maintain weight | TDEE | Weight stays same |
| Lose weight | TDEE – 500 | Lose ~0.5 kg (1 lb) per week |
| Gain weight | TDEE + 500 | Gain ~0.5 kg (1 lb) per week |
Important Safety Guidelines
According to Harvard Health Publications and USDA Dietary Guidelines:
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Women: Do not consume less than 1,200 calories daily without medical supervision
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Men: Do not consume less than 1,500 calories daily without medical supervision
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Maximum safe loss: 1 kg (2 lbs) per week
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Maximum calorie reduction: 1,000 calories from maintenance
⚠️ Losing more than 2 pounds per week can lead to muscle loss, nutritional deficiencies, and metabolic slowdown.
Zigzag Calorie Cycling
Zigzag cycling involves alternating between higher and lower calorie days to prevent metabolic adaptation. This approach can help overcome weight loss plateaus.
Example Weekly Plan (14,000 calories total):
| Day | Calories |
|---|---|
| Monday | 2,300 |
| Tuesday | 1,775 |
| Wednesday | 2,300 |
| Thursday | 1,775 |
| Friday | 2,300 |
| Saturday | 1,775 |
| Sunday | 1,775 |
Total: 14,000 calories (same as eating 2,000 daily)
Benefits include:
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Prevents metabolic slowdown
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Allows flexibility for social events
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Reduces feelings of deprivation
Calories in Common Foods
| Food | Serving Size | Calories |
|---|---|---|
| Fruits | ||
| Apple | 1 medium | 95 |
| Banana | 1 medium | 105 |
| Orange | 1 medium | 62 |
| Grapes | 1 cup | 100 |
| Strawberries | 1 cup | 53 |
| Vegetables | ||
| Broccoli | 1 cup | 45 |
| Carrots | 1 cup | 50 |
| Spinach | 1 cup | 7 |
| Tomato | 1 medium | 22 |
| Proteins | ||
| Chicken breast | 3 oz cooked | 140 |
| Beef (lean) | 3 oz cooked | 180 |
| Salmon | 3 oz cooked | 175 |
| Egg | 1 large | 78 |
| Tofu | 4 oz | 86 |
| Grains & Carbs | ||
| Brown rice | 1 cup cooked | 215 |
| White rice | 1 cup cooked | 206 |
| Quinoa | 1 cup cooked | 222 |
| Oatmeal | 1 cup cooked | 158 |
| Whole wheat bread | 1 slice | 75 |
| Dairy | ||
| Milk (1%) | 1 cup | 102 |
| Milk (whole) | 1 cup | 146 |
| Greek yogurt | 1 cup | 150 |
| Cheddar cheese | 1 oz | 113 |
| Beverages | ||
| Water | 8 oz | 0 |
| Coffee (black) | 8 oz | 2 |
| Orange juice | 8 oz | 111 |
| Soda | 12 oz can | 150 |
| Beer | 12 oz | 154 |
| Wine | 5 oz | 120 |
| Snacks & Treats | ||
| Dark chocolate | 1 oz | 155 |
| Potato chips | 1 oz | 152 |
| Peanut butter | 1 tbsp | 94 |
| Almonds | 1 oz (23 nuts) | 164 |
| Popcorn (air-popped) | 3 cups | 93 |
Calories Burned by Exercise (Per Hour)
| Activity | 125 lb person | 155 lb person | 185 lb person |
|---|---|---|---|
| Walking (3.5 mph) | 215 | 267 | 319 |
| Running (6 mph / 10 min mile) | 495 | 614 | 733 |
| Running (7.5 mph / 8 min mile) | 624 | 773 | 923 |
| Cycling (12-14 mph) | 454 | 562 | 671 |
| Swimming (moderate) | 397 | 492 | 587 |
| Yoga | 150 | 186 | 222 |
| Weight lifting (moderate) | 180 | 223 | 266 |
| HIIT workout | 400 | 496 | 592 |
| Basketball | 340 | 422 | 503 |
| Soccer | 397 | 492 | 587 |
| Tennis | 397 | 492 | 587 |
| Golf (walking) | 283 | 352 | 420 |
Sample Meal Plans
1,500 Calorie Day Plan
| Meal | Foods | Calories |
|---|---|---|
| Breakfast | 2 eggs + 1 slice whole grain toast + 1/2 avocado | 400 |
| Snack | Greek yogurt (1/2 cup) + berries | 120 |
| Lunch | Grilled chicken salad with olive oil dressing | 450 |
| Snack | Apple + 1 tbsp peanut butter | 180 |
| Dinner | Salmon (4 oz) + quinoa (1/2 cup) + broccoli | 500 |
| Total | 1,650 |
2,000 Calorie Day Plan
| Meal | Foods | Calories |
|---|---|---|
| Breakfast | Oatmeal with banana, walnuts, honey | 450 |
| Snack | Protein shake | 150 |
| Lunch | Turkey sandwich on whole grain + side salad | 550 |
| Snack | Hummus with carrot sticks + apple | 200 |
| Dinner | Chicken breast (6 oz) + sweet potato + asparagus | 650 |
| Total | 2,000 |
How to Use a Calorie Calculator for Weight Loss
Step 1: Calculate Your TDEE
Enter your age, weight, height, gender, and activity level into the calorie calculator above.
Step 2: Set a Realistic Deficit
Subtract 300-500 calories from your TDEE for sustainable weight loss.
Step 3: Track Your Intake
Use apps like MyFitnessPal or Cronometer to log your daily food.
Step 4: Monitor Progress
Weigh yourself weekly at the same time (morning, after bathroom, before eating).
Step 5: Adjust as Needed
If weight loss stalls after 2-3 weeks, reassess your intake or increase activity.
Common Mistakes to Avoid
| Mistake | Why It’s a Problem |
|---|---|
| Eating too few calories | Slows metabolism, causes muscle loss |
| Not tracking accurately | Most people underestimate intake by 30-50% |
| Ignoring portion sizes | “Healthy” foods still have calories |
| Not adjusting for exercise | Active days require more fuel |
| Expecting overnight results | Healthy weight loss takes time |
Frequently Asked Questions
How accurate is a calorie calculator?
Calorie calculators provide estimates, not exact numbers. Individual metabolism varies based on genetics, hormones, and body composition. Use the result as a starting point and adjust based on real-world results.
What’s the best formula for calculating calories?
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Mifflin-St Jeor: Most accurate for general population
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Katch-McArdle: Best if you know your body fat percentage
-
Harris-Benedict: Historical standard, slightly less accurate
How many calories should I eat to lose weight?
Subtract 300-500 calories from your TDEE. This yields 0.3-0.5 kg (0.7-1 lb) loss per week.
Can I lose weight by only cutting calories?
Yes, but combining calorie reduction with exercise yields better results and preserves muscle mass.
How many calories do I need to maintain weight?
Your TDEE is your maintenance calories. Eat this amount to keep your current weight.
Is it safe to eat 1,200 calories a day?
For some smaller, sedentary women, 1,200 may be adequate. However, most people need more. Consult a healthcare provider before starting very low-calorie diets.
Do I need to count calories forever?
Not necessarily. Many people count calories temporarily to build awareness, then transition to intuitive eating or portion control.
Official Resources
| Organization | Resource | Purpose |
|---|---|---|
| USDA | Dietary Guidelines for Americans | Official nutrition recommendations |
| WHO | Healthy Diet Factsheet | Global dietary guidance |
| NHS | Calorie Counting Guide | UK health service advice |
| Harvard Health | Calorie Counting | Evidence-based weight loss tips |
| CDC | Healthy Weight | US government guidelines |
Conclusion
A calorie calculator is a powerful tool for understanding your body’s energy needs. Whether your goal is weight loss, maintenance, or muscle gain, knowing your BMR and TDEE gives you a science-based starting point.
Remember that calories are only part of the picture. Nutrient quality, meal timing, sleep, stress management, and physical activity all play crucial roles in health and body composition.
Use our free calorie calculator above to find your numbers, then take the first step toward your health goals today.
Related Tools
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BMI Calculator – Check your Body Mass Index
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Live Age Counter – Watch your age grow in real-time
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Full Calculator – Advanced math tool
References
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Mifflin, MD, et al. (1990). “A new predictive equation for resting energy expenditure in healthy individuals.”
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Harris JA, Benedict FG. (1918). “A biometric study of human basal metabolism.”
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Katch, FI, et al. (1983). “Estimation of body fat from skinfold thicknesses.”
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USDA FoodData Central. (2024). “Standard Reference Legacy Release.”
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Harvard Health Publishing. (2024). “Calorie counting made easy.”