What does a weight-loss estimate mean?
A planning estimate connects an energy gap with a possible scale of change. Real weight loss includes changing amounts of fat, lean tissue, water, and glycogen, so the same calorie gap does not produce the same result every week.
A simple energy-balance scenario
Mifflin–St Jeor and an activity factor estimate maintenance calories. A selected percentage creates a daily deficit. The weekly illustration divides seven days of deficit by 7,700 kcal/kg, a fixed approximation rather than a dynamic model.
How to use this calculator
- 1Enter your current measurements, activity, and a lower target weight.
- 2Select the percentage deficit to explore.
- 3Calculate the calorie target and weekly scenario, then read the tool's limits.
Understanding your result
Use the weekly figure to compare scenarios, not to judge a single week as success or failure. Reassess if energy, training, hunger, or weight trends suggest the plan is not appropriate. The target weight is a planning input, not an endorsement.
Assumptions & limitations
- The static calculation does not model falling energy needs, metabolic adaptation, adherence, or water changes.
- This tool excludes underweight targets and some low-intake scenarios; those limits do not establish individual safety.
Frequently asked questions
Will I lose the displayed amount every week?+
No. The number assumes a constant estimated deficit and fixed energy-to-weight conversion. Real progress is variable and often slows over time.
Why can the first week look unusually fast?+
Changes in carbohydrate intake, sodium, and food volume can change water, glycogen, and digestive contents. Scale loss is not all body fat.
Can I increase the deficit if progress stalls?+
Do not assume that is the best response. First review the length of the plateau, measurement consistency, intake records, activity, and whether the plan supports adequate nutrition.
Is this suitable if I am already underweight?+
No. This calculator is not intended to support underweight goals or replace professional assessment of weight or nutritional concerns.
