Daily Calorie Needs Calculator – How Many Calories Should You Eat?
Find out exactly how many calories you need each day with our daily calorie needs calculator. Personalized results based on your age, weight, height, and activity level.
BMR (Basal Metabolic Rate) is what you'd burn lying in bed all day – breathing, circulating blood, cell repair. It's your body's idle power consumption. For most people, BMR is 1200-1800 calories.
TDEE (Total Daily Energy Expenditure) includes everything: BMR plus walking, exercising, digesting food, even fidgeting. TDEE is typically 1.2-1.9× your BMR depending on activity. This is your maintenance calories – eat this much and weight stays stable.
Calorie Deficits and Surpluses
| Goal | Calorie Adjustment | Expected Change |
|---|---|---|
| Extreme loss | -25% TDEE | ~1.5 lb/week (not recommended long-term) |
| Weight loss | -15% TDEE | ~1 lb/week (sustainable) |
| Mild loss | -10% TDEE | ~0.5 lb/week (easy to maintain) |
| Maintain | 0% (eat at TDEE) | Weight stable |
| Mild gain | +5% TDEE | ~0.25 lb/week (lean bulk) |
| Weight gain | +10% TDEE | ~0.5 lb/week (muscle gain) |
| Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Desk job, little or no exercise, mostly sitting |
| Lightly Active | 1.375 | Light exercise 1-3 days/week, or standing job |
| Moderately Active | 1.55 | Moderate exercise 3-5 days/week, or active job |
| Active | 1.725 | Hard exercise 6-7 days/week, or physical job |
| Very Active | 1.9 | Very hard exercise daily, or labor-intensive job |
Be honest about your activity level. Most people overestimate. "Lightly Active" means you actually work out 1-3 times per week, not that you walked to the car.
| Age | Women (calories/day) | Men (calories/day) |
|---|---|---|
| 18-25 | 2,000-2,200 | 2,400-2,800 |
| 26-35 | 1,900-2,100 | 2,300-2,700 |
| 36-45 | 1,800-2,000 | 2,200-2,600 |
| 46-55 | 1,700-1,900 | 2,100-2,500 |
| 56-65 | 1,600-1,800 | 2,000-2,400 |
| 65+ | 1,500-1,700 | 1,900-2,300 |
These are averages for moderately active adults. Individual needs vary based on weight, height, muscle mass, and actual activity level. Use the calculator above for personalized results.
How accurate is this calorie calculator?
The Mifflin-St Jeor equation used here is accurate within about 10% for most people. That's ±200-300 calories for average adults. Use the result as a starting point, then adjust based on actual results over 2-4 weeks.
Why am I not losing weight at my calculated deficit?
Common reasons: underestimating food intake (people typically undercount by 30-50%), overestimating activity, water retention masking fat loss, or your actual TDEE is lower than calculated. Track everything precisely for 2 weeks, then adjust.
Should I eat back exercise calories?
If you calculated TDEE correctly with your actual activity level, no – it's already included. Fitness trackers notoriously overestimate calories burned. If you use sedentary TDEE and exercise separately, add back 50-75% of tracked calories (they overestimate).
How low can I go on calories?
Minimum safe intake: 1,200 calories/day for women, 1,500 for men. Below this, it's hard to get adequate nutrients. Very low calorie diets (under 800) should only be done under medical supervision. Slow loss is more sustainable anyway.
Do calorie needs change with weight loss?
Yes. As you lose weight, your BMR drops – smaller bodies need fewer calories. Recalculate every 10-15 lbs lost. Also, metabolic adaptation can reduce TDEE by an extra 5-15% beyond what weight loss alone predicts.
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