Daily Calorie Intake Calculator
### Clinical Nutritional Science & Metabolic Energy Expenditure Metrology Human daily caloric requirement is governed by metabolic rate and physical activity: - **1. Mifflin-St Jeor Basal Metabolic.
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📐 Formula
💡 Practical Example
A 30-year-old male weighing 180 lbs calculates that his TDEE is 2,763 kcal/day, setting a daily target of 2,263 kcal (a 500 kcal deficit) with 180g of protein to lose 1.0 lb of fat per week while preserving lean muscle mass.
📖 About Daily Calorie Intake Calculator
Clinical Nutritional Science & Metabolic Energy Expenditure Metrology
Human daily caloric requirement is governed by metabolic rate and physical activity:
- **
- Mifflin-St Jeor Basal Metabolic Rate (BMR) Formula**:
BMR_male = 10 × W_kg + 6.25 × H_cm - 5 × Age + 5
BMR_female = 10 × W_kg + 6.25 × H_cm - 5 × Age - 161
- **
- Physical Activity Level (PAL) Multipliers for TDEE**:
TDEE = BMR × PAL
- Sedentary: 1.20×
- Lightly Active: 1.375×
- Moderately Active: 1.55×
- Very Active: 1.725×
- Extra Active: 1.90×
- **
- The 3,500 kcal Fat Loss Rule**:
- 1 lb of Adipose Body Fat ≈ 3,500 kcal
- 500 kcal/day Deficit × 7 days = 3,500 kcal 1.0 lb/week loss
- **
- Standard Metabolic Benchmarks**:
- 30-Yr Male (180 lbs, 5'10", Mod Active): BMR 1,783 | TDEE 2,763 | Cut at 2,263 kcal
- 28-Yr Female (145 lbs, 5'5", Light Active): BMR 1,399 | TDEE 1,924 | Cut at 1,424 kcal
- 25-Yr Male (190 lbs, 6'0", Very Active): BMR 1,902 | TDEE 3,281 | Bulk at 3,581 kcal
- 40-Yr Male (200 lbs, 5'9", Sedentary): BMR 1,811 | TDEE 2,173 | Maintain at 2,173 kcal
How to Use This Calculator
Enter your Biological Sex — select from Male (+5 Mifflin-St Jeor constant), Female (-161 Mifflin-St Jeor constant), Age (e.g. 30 in years), Body Weight (e.g. 180 in lbs), Height (e.g. 70 in inches), Physical Activity Level (PAL) — select from Sedentary (Desk Job, Little/No Exercise - 1.20× BMR), Lightly Active (1–3 Days/Week Exercise - 1.375× BMR), Moderately Active (3–5 Days/Week Moderate Workout - 1.55× BMR), Weight & Body Composition Goal — select from Maintain Current Weight (0 Calorie Deficit/Surplus), Mild Weight Loss (-250 kcal/day → 0.5 lb / week), Standard Weight Loss (-500 kcal/day → 1.0 lb / week), and Standard Metabolic Benchmark — select from Custom Individual Profile, 30-Yr-Old Male (180 lbs, 5'10", Mod Active) → BMR 1,783 kcal | TDEE 2,763 kcal → Cut at 2,263 kcal/day, 28-Yr-Old Female (145 lbs, 5'5", Light Active) → BMR 1,399 kcal | TDEE 1,924 kcal → Cut at 1,424 kcal/day. Results update instantly — no submit button needed. Use metric or imperial units as labeled. For the most accurate result, measure height and weight in the morning without shoes.
The Formula
Male: BMR = 10 W_kg + 6.25 H_cm - 5 * Age + 5
Female: BMR = 10 W_kg + 6.25 H_cm - 5 * Age - 161
Worked Example
A 30-year-old male weighing 180 lbs calculates that his TDEE is 2,763 kcal/day, setting a daily target of 2,263 kcal (a 500 kcal deficit) with 180g of protein to lose 1.0 lb of fat per week while preserving lean muscle mass.
Understanding Your Result
Your BMR is the calories burned at complete rest — your TDEE (Total Daily Energy Expenditure) adds activity. To lose 1 lb/week, create a 500 kcal/day deficit. To lose 2 lbs/week, a 1,000 kcal/day deficit is required — this is generally the safe maximum recommended by clinicians. Below 1,200 kcal/day for women or 1,500 kcal/day for men risks metabolic adaptation and nutrient deficiencies. Protein intake of 1.6–2.2 g/kg body weight preserves muscle during a caloric deficit.
💡 Expert Health Guidance & Clinical Context
- This calculator uses clinically validated formulas and population reference data published by the WHO and NIH. Results are screening estimates, not medical diagnoses.
- Consult a licensed healthcare provider before making any changes to diet, medication, or exercise based on these results — individual variation is significant.
- Genetics, chronic conditions, and concurrent medications can dramatically affect what a "normal" result means for a specific individual.
- Track your results over time: a single data point is less meaningful than a trend measured consistently across multiple weeks or months.
- The CDC recommends adults receive routine health screenings at least annually. Use these calculations to prepare informed questions for your physician.
- Body composition, lifestyle factors, and stress levels all interact with the metrics shown here. No single number captures your full health picture.
- For pediatric or geriatric populations, reference ranges may differ significantly from the adult standards used in general calculators.
- Always cross-reference results with laboratory tests, clinical examinations, and professional medical evaluation before acting on any finding.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.