Calories Burned Exercise Calculator

One kilogram of body fat contains approximately 7,700 calories. To lose 1 kg/week, you need a daily calorie deficit of ~1,100 kcal. This is aggressive and difficult to sustain. Most experts recommend 0.5 kg/week (500 kcal daily deficit) for sustainable, muscle-preserving fat loss.

Minor adjustments (100-200 kcal less on rest days) are fine, but the difference is smaller than most people think. Muscle repair happens primarily during rest, requiring energy. Many athletes eat the same calories daily regardless of activity to simplify tracking and support recovery.

The minimum safe intake is generally 1,200 kcal/day for women and 1,500 kcal/day for men. Going below these thresholds risks nutrient deficiency, muscle loss, hair loss, immune suppression, and metabolic slowdown (adaptive thermogenesis).

No. Most people count calories for 3-6 months to build intuitive awareness of portion sizes and food composition. After that, many people can maintain their target weight through mindful eating habits without active counting.

Metabolic rate naturally declines by roughly 1-2% per decade after age 25, largely due to gradual muscle mass loss (sarcopenia). This is why people tend to gain weight as they age without changing eating habits. Resistance training mitigates this decline significantly.