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Disclaimer: This calculator provides general health information and estimates for educational purposes only. It is not medical advice, a diagnosis, or a treatment recommendation, and it is not a substitute for care from a licensed healthcare provider. Results are based on population formulas and may not reflect your individual health status, medications, or medical conditions. Never use this tool to start, stop, or adjust any medication, treatment, diet, or exercise program without professional guidance. Any drug-dosing results are teaching aids only and must be independently verified against drug-specific protocols and confirmed by a licensed clinician or pharmacist before use. Always consult a physician, pharmacist, or registered dietitian for guidance specific to your situation.
Frequently Asked Questions
Q
How many calories do I need per day?
Daily calorie needs vary by age, sex, activity level, and goals. Average adult women need 1,800-2,200 calories for maintenance; men need 2,200-2,800 calories. For example, a 30-year-old woman (5'6", 150 lbs, moderately active) needs about 2,100 calories/day to maintain weight.
Very active: Hard exercise 6-7 days/week (1.725x BMR)
Athletes training 2x/day may need 3,500-5,000+ calories
Age/Sex
Sedentary
Moderately Active
Very Active
Women 19-25
1,800-2,000
2,000-2,200
2,400
Women 26-50
1,800
2,000
2,200
Men 19-25
2,400
2,600-2,800
3,000
Men 26-45
2,200-2,400
2,400-2,600
2,800-3,000
According to the Dietary Guidelines for Americans from the USDA, calorie needs decrease with age due to slower metabolism and reduced muscle mass. Use our calculator for a personalized estimate based on the Mifflin-St Jeor equation, considered the most accurate formula.
Q
What is TDEE?
TDEE (Total Daily Energy Expenditure) is the total calories you burn per day, including BMR (calories at rest), physical activity, and food digestion. TDEE = BMR × activity multiplier. For example, if your BMR is 1,500 and you're moderately active (1.55x), your TDEE is 2,325 calories.
BMR: 60-75% of TDEE (calories burned at complete rest)
Activity: 15-30% of TDEE (exercise + daily movement)
Thermic Effect of Food: 10% of TDEE (digestion energy)
TDEE is your maintenance calories - eat this amount to stay the same weight. Eat 10-20% less to lose weight gradually, or 10-15% more to gain weight. TDEE changes as your weight changes, so recalculate every 10-15 pounds or monthly.
Q
How do I lose weight with calories?
Create a 500-750 calorie daily deficit to lose 1-1.5 pounds per week safely. If your TDEE is 2,300 calories, eat 1,550-1,800 calories daily. Never eat below 1,200 calories (women) or 1,500 (men) to avoid nutrient deficiencies and metabolism slowdown.
3,500 calories = 1 pound of body fat
Aim for 1% body weight loss per week maximum
Track calories using apps like MyFitnessPal or Cronometer
Weigh yourself weekly, same day/time, track average
Adjust if not losing 0.5-2 lbs/week after 2-3 weeks
Weekly Goal
Daily Deficit
Example TDEE 2,300
Timeframe
0.5 lb/week
-250 cal
2,050 calories
Slow & sustainable
1 lb/week
-500 cal
1,800 calories
Recommended
1.5 lb/week
-750 cal
1,550 calories
Aggressive
2 lb/week
-1,000 cal
1,300 calories
Short-term only
The National Institutes of Health recommends gradual weight loss of 1-2 pounds weekly for sustainable results. Faster weight loss often leads to muscle loss, nutrient deficiencies, and rebound weight gain. Combine calorie deficit with strength training to preserve muscle mass.
Q
How do I gain muscle with calories?
Eat 200-500 calories above TDEE (10-15% surplus) while following a strength training program 3-5 days/week. For example, if TDEE is 2,500, eat 2,700-3,000 calories with 150-200g protein daily. Expect to gain 0.5-1 lb per week (mix of muscle and some fat).
Protein: 0.7-1g per pound body weight (priority #1)
Carbs: 40-50% of calories (fuel for workouts)
Fats: 20-30% of calories (hormone production)
Smaller surplus = less fat gain, slower muscle gain
Larger surplus = faster gains, more fat gain
Surplus Size
Calories Above TDEE
Weekly Gain
Muscle:Fat Ratio
Conservative
+200-300
0.25-0.5 lb
Lean bulk
Moderate
+300-500
0.5-1 lb
Balanced
Aggressive
+500-750
1-1.5 lb
More fat gain
Research from the Journal of the International Society of Sports Nutrition shows optimal muscle gain occurs at 0.5-1 lb per week for beginners, 0.25-0.5 lb weekly for intermediates. Eating more than 500 calories above TDEE leads mainly to fat gain, not extra muscle.
Q
What is BMR vs TDEE?
BMR (Basal Metabolic Rate) is calories burned at complete rest for basic functions like breathing and circulation. TDEE includes BMR plus all activity. Example: BMR = 1,500, TDEE with moderate activity = 2,325 (1,500 × 1.55 activity multiplier). BMR is typically 60-75% of TDEE.
BMR: Energy for heart, lungs, brain, organs at rest
TDEE= BMR multiplied by activity factor (1.2 to 1.9)
Goal Adjustment= -500 cal for weight loss, 0 for maintenance, +500 for weight gain
Understanding Calories and Energy Balance
1
TDEE Science: How the Mifflin-St Jeor Equation Works
The Mifflin-St Jeor equation calculates BMR (Basal Metabolic Rate) — calories burned at complete rest — then multiplies by an activity factor to produce TDEE. For men: BMR = 10 × weight(kg) + 6.25 × height(cm) – 5 × age + 5. For women: replace +5 with –161. The American Dietetic Association recommends this formula as the most accurate for estimating calorie needs, predicting within ±10% for most adults.
TDEE = BMR × activity multiplier, where multipliers range from 1.2 (sedentary) to 1.9 (professional athlete). Individual variation of 5–15% exists even at the same activity level due to differences in NEAT (Non-Exercise Activity Thermogenesis) — fidgeting, posture changes, and spontaneous movement that can account for 200–400 calories daily.
A 30-year-old woman at 60 kg and 165 cm has BMR = 600 + 1,031 – 125 – 161 = 1,345 cal/day. At moderate activity (1.55), her TDEE is 2,085 cal/day. Use the BMR calculator for a detailed breakdown of the resting component, or the calories burned calculator to quantify specific exercise sessions.
TDEE is your maintenance calories — eat this amount to neither gain nor lose weight. All weight goals adjust from this baseline.
2
Weight Goals: Caloric Targets for Loss, Maintenance, and Gain
A 500-calorie daily deficit produces approximately 1 lb of fat loss per week (3,500 calories = 1 lb of body fat). For someone with TDEE of 2,300 cal, the weight loss target is 1,800 cal/day. The National Institutes of Health recommends 1–2 lbs per week as the maximum sustainable rate — faster loss risks muscle wasting, metabolic adaptation, and nutrient deficiencies.
Minimum calorie floors exist for safety: never eat below 1,200 calories (women) or 1,500 calories (men) without medical supervision. These thresholds ensure adequate micronutrient intake and prevent metabolic shutdown. If your calculated target falls below these floors, reduce the deficit and add exercise to create the remaining gap.
For muscle gain, a surplus of 200–500 calories above TDEE fuels new tissue growth. Beginners can gain 1–2 lbs of muscle per month with proper training and a 300–500 cal surplus. Eating more than 500 above TDEE mostly adds fat, not extra muscle. The ratio of muscle-to-fat gain depends heavily on training stimulus and protein intake — use the carb calculator to optimize your macro split.
Goal
Calorie Adjustment
TDEE 2,000 Target
TDEE 2,500 Target
Expected Rate
Aggressive loss
–750 cal/day
1,250 cal
1,750 cal
1.5 lbs/week
Steady loss
–500 cal/day
1,500 cal
2,000 cal
1 lb/week
Slow loss
–250 cal/day
1,750 cal
2,250 cal
0.5 lb/week
Maintenance
0
2,000 cal
2,500 cal
No change
Lean gain
+300 cal/day
2,300 cal
2,800 cal
0.5–1 lb/week
Aggressive gain
+500 cal/day
2,500 cal
3,000 cal
1–1.5 lbs/week
3
Macro Splits by Goal: Protein, Carbs, and Fat
Macronutrient ratios shift with your goal. For weight loss, higher protein (35% of calories) preserves muscle mass during a deficit: on a 1,800 cal target, that’s 158 g of protein per day. Carbs at 35% (158 g) fuel workouts while fat at 30% (60 g) maintains hormonal function. Without adequate protein during a cut, up to 25% of weight lost comes from muscle rather than fat.
For maintenance, a balanced 30/40/30 split (protein/carbs/fat) works for most active adults. Endurance athletes may shift to 25/55/20 to maximize glycogen stores, while strength athletes may prefer 35/35/30 for higher protein. Each gram of protein and carbohydrate provides 4 calories; each gram of fat provides 9 calories.
Muscle gain requires a 25/50/25 split emphasizing carbohydrates to fuel intense training and support insulin-mediated nutrient delivery to muscles. On a 3,000 cal surplus diet, this means 188 g protein, 375 g carbs, and 83 g fat per day. The BMR calculator provides the resting baseline these macro targets build upon.
Goal
Protein
Carbs
Fat
Example at 2,000 cal
Weight Loss
35%
35%
30%
175g P / 175g C / 67g F
Maintenance
30%
40%
30%
150g P / 200g C / 67g F
Muscle Gain
25%
50%
25%
125g P / 250g C / 56g F
4
How to Use This Calorie Calculator
Enter your sex, age, weight, height, activity level, and goal (lose, maintain, or gain). The calculator computes BMR via Mifflin-St Jeor, multiplies by your activity factor for TDEE, and applies a –500, 0, or +500 calorie adjustment based on your goal. Results include daily calorie target and a full macronutrient breakdown in grams.
Recalculate every 10–15 lbs of weight change, since BMR shifts with body mass. If you’re not seeing expected results after 2–3 weeks, adjust activity level downward (most people overestimate) or reduce calories by an additional 100–200 per day. Track actual intake with a food scale for the first 2 weeks to calibrate portion awareness.
1
Enter personal details
Input sex, age, weight (kg or lbs), and height (cm or ft/in). Morning weight without shoes is most accurate.
2
Select activity level
Choose sedentary (1.2) through very active (1.9). Office workers who exercise 3x/week = lightly active (1.375), not moderate.
3
Choose your goal
Lose weight (–500 cal), maintain, or gain weight (+500 cal). The calculator ensures targets never fall below safe minimums.
4
Review calories and macros
Use the daily target and macro split to plan meals. Protein target is the most important number to hit consistently.
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.
