Calorie Calculator

A calorie calculator estimates how many calories your body needs each day based on your age, gender, height, weight, and activity level. It uses this data to calculate your BMR and TDEE, then gives you tailored targets for weight loss, maintenance, or weight gain.

BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest — just to keep vital functions like breathing, circulation, and cell repair running. It forms the foundation of all calorie calculations. Even if you stayed in bed all day, your body would still need this many calories to survive.

Maintenance calories are the total number of calories you need each day to keep your body weight stable, factoring in your activity level on top of your BMR. Eating consistently above this leads to weight gain; consistently below leads to weight loss.

TDEE (Total Daily Energy Expenditure) is your total calorie burn including all physical activity, while BMR is only what you burn at rest. TDEE = BMR × an activity multiplier. For example, someone with a BMR of 1,655 kcal who exercises moderately may have a TDEE of around 2,500 kcal/day.

A mild deficit of 250–300 calories below your maintenance is ideal for steady, sustainable fat loss of roughly 0.25–0.5 kg per week. A moderate deficit of 500 calories/day can produce faster results but may be harder to maintain. Dropping below 1,200 kcal/day (women) or 1,500 kcal/day (men) is generally not recommended without medical supervision.

Most people do well starting with a 250–500 calorie daily deficit below their maintenance level. Aggressive deficits beyond 700–1,000 calories can lead to muscle loss, fatigue, nutritional deficiencies, and metabolic adaptation — where your body compensates by burning fewer calories overall.

To gain weight gradually, aim for a caloric surplus of 250–500 calories above your maintenance level. This mild weight gain approach minimizes excess fat accumulation while giving your muscles the energy they need to grow. Eating in a surplus of 1,000+ calories typically leads to more fat gain than muscle.

Yes, significantly. As you age, muscle mass naturally declines and metabolism slows — a process called sarcopenia. Most people experience a drop of roughly 1–2% in metabolic rate per decade after age 30. This is why calorie needs tend to decrease with age even if activity levels remain the same.

Men generally have higher calorie requirements because they tend to carry more muscle mass and less body fat than women of the same weight and height. Muscle tissue burns more calories at rest than fat tissue, which is why body composition — not just body weight — plays a pivotal role in determining calorie needs.

Activity level is one of the most consequential factors in your calorie estimate. A sedentary person uses a multiplier of ~1.2× their BMR, while someone with a very active job or intense daily training may need 1.7–1.9× their BMR. Even small increases in daily movement — like walking more — can raise your TDEE noticeably over time.

Formula-based estimates are a reliable starting point but cannot account for individual variables like hormonal differences, gut health, sleep quality, stress levels, medications, or metabolic adaptation. The best approach is to use the calculator's output as a baseline, then track your body weight trend over 2–3 weeks and adjust your intake by 100–200 calories accordingly.

Recalculate every time your weight changes by 3–5 kg, your activity level shifts, or your goal changes. As your body weight decreases during a diet, your BMR also decreases — meaning your original calorie target gradually becomes less accurate. Regular recalculation ensures your targets remain aligned with your current physiology.