Calorie Calculator
Calculate your daily calorie needs based on your body metrics and activity level
How to Use This Calorie Calculator
- Enter your age (metabolism changes with age)
- Select your gender
- Enter your height in your preferred units
- Enter your current weight
- Select your activity level honestly - most people overestimate
- Click 'Calculate Calories' to see maintenance and goal-specific targets
Example: A moderately active 35-year-old woman who is 5'5" (165 cm) and weighs 150 lbs (68 kg) needs approximately 2,050 calories daily to maintain her weight. For steady weight loss of 1 pound per week, she would target 1,550 calories.
Tip: Be honest about your activity level. 'Moderately active' means structured exercise 3-5 days per week, not just being on your feet at work.
Why Use a Calorie Calculator?
Knowing your calorie needs is the foundation of any nutrition plan - whether your goal is weight loss, muscle gain, or maintaining your current weight.
- Setting a sustainable calorie target for weight loss
- Calculating calories needed to build muscle without excess fat
- Understanding your maintenance calories to stop dieting cycles
- Planning meals and grocery shopping with calorie goals in mind
- Adjusting intake as your weight or activity level changes
- Comparing your current eating habits to actual needs
Understanding Your Results
Your calorie targets are based on the Mifflin-St Jeor equation, which research shows is the most accurate for most people.
| Result | Meaning | Action |
|---|---|---|
| Maintenance Calories | Weight Stable | This is your TDEE - the calories needed to maintain current weight with your activity level. |
| Mild Deficit (-250) | Slow Weight Loss | Lose approximately 0.5 lb per week. Most sustainable approach with minimal muscle loss. |
| Moderate Deficit (-500) | Steady Weight Loss | Lose approximately 1 lb per week. Recommended for most people seeking weight loss. |
| Aggressive Deficit (-1000) | Rapid Weight Loss | Lose approximately 2 lb per week. Risk of muscle loss and metabolic adaptation. Not recommended long-term. |
| Surplus (+250-500) | Weight/Muscle Gain | For building muscle, combine with strength training. Expect some fat gain alongside muscle. |
Meaning: Weight Stable
Action: This is your TDEE - the calories needed to maintain current weight with your activity level.
Meaning: Slow Weight Loss
Action: Lose approximately 0.5 lb per week. Most sustainable approach with minimal muscle loss.
Meaning: Steady Weight Loss
Action: Lose approximately 1 lb per week. Recommended for most people seeking weight loss.
Meaning: Rapid Weight Loss
Action: Lose approximately 2 lb per week. Risk of muscle loss and metabolic adaptation. Not recommended long-term.
Meaning: Weight/Muscle Gain
Action: For building muscle, combine with strength training. Expect some fat gain alongside muscle.
Note: These are estimates. Track your weight over 2-3 weeks and adjust intake by 100-200 calories based on actual results.
About Calorie Calculator
Formula
TDEE = BMR x Activity Factor BMR is calculated using Mifflin-St Jeor: Men (10 x weight kg) + (6.25 x height cm) - (5 x age) + 5. Women use -161 instead of +5. Activity factors: Sedentary (1.2), Light (1.375), Moderate (1.55), Very Active (1.725), Extra Active (1.9).
Current Standards: Dietary Guidelines recommend 1,600-2,400 calories for adult women and 2,000-3,000 for adult men, depending on age and activity. Minimum safe intake is generally considered 1,200 for women and 1,500 for men without medical supervision.
Frequently Asked Questions
Why am I not losing weight at my calculated calorie target?
Several possibilities: 1) You may be underestimating portion sizes - weighing food is more accurate than measuring cups. 2) You might be overestimating your activity level - most people are closer to 'sedentary' than they think. 3) You're not tracking everything - cooking oils, sauces, and drinks add up. 4) Your body has adapted to lower intake (metabolic adaptation). Try reducing by another 100-200 calories or adding more movement.
Should I eat back calories burned during exercise?
It depends on how you set your activity level. If you selected 'moderately active' assuming you exercise, your TDEE already includes those exercise calories - don't eat them back. If you selected 'sedentary' and exercise is extra, you can eat back some (not all) exercise calories since most devices overestimate burn. A safe approach: eat back 50% of estimated exercise calories.
What's the minimum calories I should eat?
Generally, women shouldn't go below 1,200 calories and men below 1,500 without medical supervision. Eating below these levels makes it difficult to get adequate nutrients and can trigger muscle loss, hair loss, hormonal disruption, and metabolic slowdown. If your calculated deficit drops you below these minimums, either accept slower weight loss or increase activity to create a larger deficit through movement rather than extreme restriction.
How do I account for cheat meals or weekends?
Think in weekly calories, not daily. If your daily target is 1,800 (12,600/week), you could eat 1,600 on weekdays to 'bank' 1,000 extra calories for a weekend meal. However, this doesn't work well psychologically for everyone. Alternatively, aim for maintenance calories on special occasions rather than large deficits - one day at maintenance won't ruin progress, but regular binges will.
Should I adjust calories on rest days?
For most people, keeping calories consistent simplifies meal planning and is easier to maintain. If you want to cycle calories, eat slightly more on training days (focus on carbs for fuel) and slightly less on rest days. Total weekly calories should still match your goal. Advanced athletes benefit from calorie cycling, but beginners do fine with consistent daily targets.