Use this BMR and calorie calculator to estimate your basal metabolic rate, maintenance calories, and a practical daily calorie starting point for fat loss, maintenance, or a controlled muscle-gain phase. Enter your current information, choose an honest activity level, and use the result as a starting estimate you can refine with real-world progress.
For adults 18 and older. Select the unit system you use, then calculate a starting estimate for your current goal.
BMR means basal metabolic rate: the energy your body needs at rest to support basic functions. It is not your daily calorie target. Maintenance calories add normal movement and training on top of that baseline.
This calculator uses the Mifflin–St Jeor equation with age, height, weight, and the sex category used by the equation. It gives you a useful estimate, not a laboratory measurement. Your real body-weight trend is the final check.
| Goal | Starting point | What to monitor |
|---|---|---|
| Fat loss | Start near a moderate deficit from estimated maintenance. | Weekly weight trend, hunger, training quality, and recovery. |
| Maintenance | Start near the maintenance estimate and keep intake consistent. | Body-weight trend over 2 to 3 weeks. |
| Muscle gain | Start near a modest surplus from estimated maintenance. | Strength progress, body-weight trend, and appetite. |
Daily scale changes are noisy because hydration, meal timing, and digestion move the number. Use several weigh-ins per week, compare weekly averages, and adjust your calorie intake in small steps rather than making a large change after one day.
Most calorie-calculator errors come from the activity multiplier, not the math. Choose sedentary if you train occasionally but spend most of the day sitting. Choose moderate only if you consistently train three to five days per week and stay reasonably active outside the gym. If you are unsure, start one level lower and use your trend to refine the estimate.
Match your nutrition target to a plan you can repeat: use the 3-day full-body workout plan or the 4-day upper/lower workout plan.
Daily calorie needs depend on age, height, weight, activity, and your goal. Use the calculator result as a starting estimate, then adjust from your real 2- to 3-week trend.
No. BMR estimates the energy you use at rest; maintenance calories estimate BMR plus daily activity and training.
A BMR calculator is useful for finding a starting point, but it cannot fully capture every person’s daily movement, training load, and individual response.
Keep your input and tracking consistent long enough to see a weekly trend, then make a small calorie adjustment rather than a large swing.
This tool is not designed for people under 18, pregnancy or breastfeeding, eating-disorder recovery, or medical conditions that affect metabolism. In those situations, use individualized guidance from a qualified clinician or dietitian.
A BMR calculator is a starting line, not a finish line. Estimate your maintenance calories, choose a sensible goal target, track the trend for a few weeks, and adjust with discipline. That is how you fuel workouts, gains, and long-term results without guessing.
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