Calorie Calculator
Calorie Calculator
Calculate daily calorie needs for your goals
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Calories: The Simple Math of Weight Change
3,500 calories = 1 pound of body weight. Eat 500 calories less daily = lose 1 lb/week. Eat 500 more = gain 1 lb/week. A 30-year-old woman, 5'5", 150 lbs, sedentary needs ~1,800 calories to maintain weight. Drop to 1,300 = lose 1 lb/week. Increase to 2,300 = gain 1 lb/week.
Your body burns calories three ways: BMR (60-75% - just staying alive), activity (15-30% - movement), and digestion (10% - processing food). Most people overestimate activity and underestimate food intake by 20-40%. That's why tracking matters more than guessing.
Quick Calorie Formulas
BMR (Basal Metabolic Rate)
Men: 10 × weight(kg) + 6.25 × height(cm) - 5 × age + 5
Women: 10 × weight(kg) + 6.25 × height(cm) - 5 × age - 161
Activity Multipliers
- Sedentary: BMR × 1.2
- Light exercise (1-3 days/wk): BMR × 1.375
- Moderate (3-5 days/wk): BMR × 1.55
- Very active (6-7 days/wk): BMR × 1.725
- Athlete (2x/day): BMR × 1.9
Calorie Targets by Goal
| Goal | Calorie Adjustment | Rate of Change |
|---|---|---|
| Aggressive Weight Loss | -1,000 cal/day | 2 lbs/week (not sustainable long-term) |
| Healthy Weight Loss | -500 cal/day | 1 lb/week (sustainable) |
| Maintenance | 0 cal | No change |
| Lean Muscle Gain | +250 cal/day | 0.5 lb/week (minimal fat gain) |
| Faster Weight Gain | +500 cal/day | 1 lb/week (muscle + fat) |
Macro Distribution
Target: 0.7-1g per lb body weight
Muscle building, satiety, metabolism
Target: 45-65% of calories
Energy, brain function, performance
Target: 20-35% of calories
Hormones, nutrient absorption
Common Calorie Mistakes
What People Get Wrong
- Overestimating exercise calories burned by 50-100%
- Underestimating food intake by 20-40%
- Not counting "small" bites, drinks, condiments
- Choosing "very active" when actually moderate
- Expecting linear progress (weight fluctuates daily)
How to Be Accurate
- Use food scale, not measuring cups
- Track everything for 1-2 weeks, be honest
- Count cooking oils (120 cal/tablespoon)
- Weigh yourself same time daily, track weekly average
- Adjust every 2-3 weeks based on results
Quick Reference: Food Calories
High-Calorie Foods (watch portions)
- Oil/butter: 120 cal/tbsp
- Nuts: 160-200 cal/oz
- Peanut butter: 190 cal/2 tbsp
- Cheese: 110 cal/oz
- Avocado: 240 cal whole
Low-Calorie, High-Volume
- Vegetables: 20-50 cal/cup
- Berries: 60-85 cal/cup
- Egg whites: 17 cal each
- Chicken breast: 165 cal/4 oz
- Greek yogurt (0%): 100 cal/cup
Frequently Asked Questions
-500 calories from your maintenance = 1 lb/week loss
Minimum: 1,200 cal (women), 1,500 cal (men)
BMR: Calories burned at rest (sleeping all day)
TDEE: Total Daily Energy Expenditure (BMR + activity)
If using TDEE method: No (already included)
If using BMR: Eat back 50% (apps overestimate burn)
- Underestimating intake (use food scale)
- Overestimating activity level
- Not tracking drinks, oils, sauces
- Water weight masking fat loss
Active/losing weight: 0.7-1g per lb body weight
Sedentary: 0.36g per lb (RDA minimum)
For weight: Yes, calories in/out determines weight
For health: No, nutrients matter for health markers
No. Track for 1-2 months to learn portion sizes
Then use intuitive eating + weekly weigh-ins to maintain
Yes, but only ~1-2% per decade after 30
Muscle loss (preventable with strength training) is bigger factor
Better approach: 80/20 rule (80% whole foods)
One 3,000 cal cheat day can erase week's deficit
Calorie burn: Overestimate by 20-50%
Best use: Track trends, not absolute numbers