How this calorie calculator works
This tool estimates your daily calorie needs using the widely accepted Mifflin-St Jeor equation. It first calculates your Basal Metabolic Rate (BMR), which is the amount of energy your body uses at rest for essential functions like breathing, circulation, and temperature regulation.
Next, it multiplies BMR by your activity factor to estimate your Total Daily Energy Expenditure (TDEE). TDEE is your maintenance level: the calories you need each day to stay around your current weight.
Finally, the calculator applies a calorie adjustment based on your goal (weight loss, maintenance, or weight gain) and provides a daily target.
Step-by-step guide to use "my calories calculator"
1) Select your unit system
Choose metric if you track height in centimeters and weight in kilograms. Choose imperial if you track height in feet/inches and weight in pounds.
2) Enter your body details
- Sex (used in BMR equation)
- Age (metabolism generally changes with age)
- Height and weight
3) Pick your activity level
Your activity multiplier matters a lot. Be honest here. If you're not sure, start with “lightly active” or “moderately active,” then adjust based on real-world progress over 2–3 weeks.
4) Choose your goal
For sustainable results, moderate targets are usually easiest to follow. Fast deficits can be hard to maintain and may affect performance, hunger, and sleep quality.
What to do after you get your calorie target
Track for consistency, not perfection
Hit your calorie target on average across the week. One day above target is normal; what matters is your long-term trend.
Prioritize protein and whole foods
- Protein helps maintain muscle while losing fat.
- High-fiber foods improve satiety.
- Hydration supports training and appetite control.
Reassess every 2–4 weeks
If your weight trend stalls, adjust calories by about 100–150 kcal/day and reassess. Small changes are easier and usually more effective than dramatic cuts.
Healthy ranges and practical advice
This calculator is for educational use and general planning. A common practical lower bound is around 1200 kcal/day for most women and 1500 kcal/day for most men, unless supervised by a qualified clinician. If your result falls below that range, treat it as a signal to use a gentler deficit or seek professional guidance.
For athletes, people with medical conditions, pregnant or breastfeeding individuals, or anyone recovering from disordered eating, personalized support from a registered dietitian or physician is strongly recommended.
Frequently asked questions
Is this exact?
No calculator is exact. Think of the result as a strong starting estimate. Your actual maintenance calories may differ by several hundred calories depending on genetics, NEAT, training volume, and adherence.
How long before I should adjust?
Usually 2–3 consistent weeks of data is enough. Track body weight averages (not single-day fluctuations) before making changes.
Can I use this for fat loss and muscle gain?
Yes. Use a small deficit for fat loss, maintenance for recomposition (especially beginners), or a small surplus for lean muscle gain.