Physics Behind Weight Loss Planning
Energy Balance
Weight loss follows energy balance. The body stores extra energy. It also releases stored energy during a deficit. This calculator treats body weight change as an energy problem. It compares estimated daily burn with planned daily intake. The gap becomes the expected deficit.
Why TDEE Matters
Total daily energy expenditure is the central value. It begins with basal metabolic rate. That is the energy used while resting. Activity then raises the total. Exercise calories can also be added. A person with a higher TDEE can usually eat more while losing weight.
Planning Pace
The calculator uses 7,700 calories for one kilogram of fat mass. This is a planning estimate. Real progress may shift because water, digestion, training, sleep, and hormones can affect scale weight. For this reason, the tool includes adherence and adaptation options.
Advanced Adjustments
Adherence lowers the effective deficit. This gives a more realistic result. Adaptation lowers estimated maintenance calories. This helps model slower progress during long diets. The safety floor prevents the plan from dropping below a chosen calorie limit.
Macros and Activity
The macro section divides calories into protein, fat, and carbohydrates. Protein is based on body weight. Fat is also based on body weight. Carbohydrates receive the remaining calories. The exercise share shows how much of the deficit comes from movement.
Using the Output
Use the result as a structured estimate. Compare several goals before choosing a plan. A slower timeline may be easier to follow. A faster timeline may require larger food changes or more activity. Review results with a qualified professional when medical concerns exist.