A daily calorie intake calculator helps you estimate how much energy your body needs each day. Whether your goal is fat loss, weight maintenance, or muscle gain, starting with a clear calorie target can make your nutrition plan easier and more consistent.
This calculator uses the Mifflin-St Jeor method to estimate basal metabolic rate (BMR), then adjusts for your activity level to estimate total daily energy expenditure (TDEE). Finally, it applies your selected goal adjustment.
How this daily calorie intake calculator works
1) Basal Metabolic Rate (BMR)
BMR is the estimated number of calories your body burns at complete rest for basic functions like breathing, circulation, and cell repair. The Mifflin-St Jeor equation is widely used for practical nutrition planning.
- Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
- Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
2) Total Daily Energy Expenditure (TDEE)
Your BMR is multiplied by an activity factor to estimate how many calories you burn in a typical day:
- Sedentary: 1.2
- Lightly active: 1.375
- Moderately active: 1.55
- Very active: 1.725
- Extra active: 1.9
3) Goal-based calorie target
Once maintenance calories are estimated, you can create a calorie deficit for fat loss or a calorie surplus for weight gain. Small changes are usually easier to sustain and protect performance, sleep, and mood.
How to use your calorie target effectively
- Track your body weight trend for 2–3 weeks (not just day-to-day fluctuations).
- Adjust intake by about 100–200 calories if progress is too slow or too fast.
- Prioritize protein intake to support muscle retention and recovery.
- Use consistent meal timing and food choices during your adjustment period.
- Recalculate after major weight changes (about every 4–6 kg or 10–12 lb).
Example: quick calorie estimate
Suppose a 30-year-old person, 70 kg and 175 cm, is moderately active. Their calculated maintenance might land around 2,300–2,500 calories per day (depending on sex and exact activity). For fat loss, a 500-calorie deficit would suggest a daily target around 1,800–2,000 calories.
Common mistakes to avoid
- Using an activity level that is too high.
- Dropping calories too aggressively from day one.
- Ignoring sleep, stress, and hydration.
- Changing calories every few days before trends become clear.
Important note
This calculator provides an estimate, not a diagnosis. Individual metabolism varies based on genetics, medical history, hormones, medication use, and training status. If you have a medical condition, are pregnant, breastfeeding, or recovering from disordered eating patterns, consult a qualified healthcare professional or registered dietitian before making major dietary changes.