Purpose and steps
Estimates the timeline from the weight difference and planned weekly pace, with an average daily energy gap based on about 3,500 kcal per pound.
- Choose units and use the pre-pregnancy, resting or current measurements requested by the tool; keep observation dates consistent.
- Prepare Current weight, Target weight, Planned pace. Defaults demonstrate the model rather than your personal circumstances.
- Check the headline result and its components. A key interpretation for this tool is: The date is a planning estimate, not a deadline.
- Compare the baseline with a changed scenario: Recalculate as weight, activity, or desired pace changes.
Input reference and units
These values reproduce the model’s demonstration. Replace them with your own records or measurements; they are not recommended targets.
On a small screen, swipe the table horizontally to see all columns.
| Parameter | Demonstration value | How to enter it |
|---|---|---|
| Current weight | 82 kg | Use the definition shown in the field label; keep this assumption consistent when comparing scenarios. |
| Target weight | 72 kg | Use the definition shown in the field label; keep this assumption consistent when comparing scenarios. |
| Planned pace | 1 lb/week | Use the definition shown in the field label; keep this assumption consistent when comparing scenarios. |
Model-specific method
How this calculator produces its result
Weeks = pounds to lose ÷ selected pounds per week. Average daily energy gap = weekly pounds × 3,500 ÷ 7.
Energy bookkeeping and weighted allocation
Energy allocation is a weighted sum because grams of protein, carbohydrate and fat have different modeled energy densities. Subtract the energy already assigned before converting the remainder into another nutrient. Dividing remaining calories by four rather than nine would miscalculate fat grams.
A static deficit or surplus is a budgeting estimate rather than a linear prediction of body-weight change. Expenditure can adapt, measurement is imperfect and changes in water and lean tissue affect weight. Activity factors can already include exercise; adding it again may double-count energy use.
TDEE ≈ estimated resting energy × activity factor Energy from macros = 4 × protein grams + 4 × carb grams + 9 × fat grams Planned balance = intake − estimated expenditure
- kcal: energy, not food mass
- g: grams of the selected macronutrient
- Activity factor: empirical multiplier, not measured exercise energy
- Balance: model estimate over the specified period
Worked example
Moving from 181 lb to 159 lb is a 22 lb difference. At 1 lb/week, the simple estimate is 22 weeks with an implied 500 kcal/day average gap.
Reproduce the default scenario
This is a separate example, calculated using the exact engine on the tool page and the defaults in the input reference above. Health examples use metric units. Displayed rounding may differ from intermediate precision.
- Estimated timeline
- 22 weeks
- Planned weight loss
- 10 kg
- Approximate duration
- 5.1 months
- Implied average daily energy gap
- 500 kcal/day
Reading results without overstating them
- The date is a planning estimate, not a deadline.
- Recalculate as weight, activity, or desired pace changes.
Assumptions and exclusions
- The 3,500-kcal rule is a simplification and real loss is not linear.
- Fluid shifts and metabolic adaptation can materially change weekly scale weight.
Sources and content notes
Toolify describes the implemented algorithm and its assumptions. Sources below support the topic or applicable rules; they do not endorse this calculator. Examples are illustrative, and published rules take precedence over simplified estimates.
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