Weight Manager Planner
Weight change comes down to calories in vs. calories out. This tool estimates your maintenance calories at your current weight and calculates intake targets for fat loss, muscle gain, or recomposition.
1) Pick your goal
Advice: Check-in and recalibrate every 14–21 days or when progress stalls.
2) Your stats
Activity level
3) Optional: body fat (for composition estimates)
Body fat % improves fat-vs-lean projections and recomposition estimates. Leave it blank if you don’t know it.
Use only to orient yourself. Measuring beats guessing. Tape takes ~60 seconds.
Optional: Don’t know your body fat? Estimate it
Reminder: the most “accurate” at-home method is the one you can repeat consistently.
Info: Uses US Navy circumference method (waist/neck/height + hip for women) and Jackson–Pollock 3-site / 7-site.
4) Results: Fat loss
Fat loss pace
Select one. Your pace is shown as expected scale-weight change per week.
It corresponds to a calorie deficit relative to your estimated maintenance.
Important: faster isn’t better if adherence breaks.
Enter a positive number. The tool applies it as weight loss.
Projected timeline
Range assumes real-world variance. “Likely” matches the selected pace.
| Milestone | Best | Likely | Worst |
|---|---|---|---|
| Date to target weight | — | — | — |
| Date to target body fat % | — | — | — |
Maintenance at goal weight
Nutritional Macro split
Calibration (so the plan stays accurate)
This is an initial estimate; adjust after 14–21 days using trend weight.
- Track daily weigh-ins and look at a 7–14 day trend.
- After 14–21 days, if your trend isn’t moving near the target %BW/week, adjust calories by ~3–5% and reassess.
Export your inputs + results (copy/paste)
Use this text in an AI prompt for meal planning and training planning. (Inputs + outputs only.)
Coach notes 0
Scientific basis (formulas used)
- Maintenance calories (TDEE): BMR × activity factor.
- BMR default: Mifflin–St Jeor.
- BMR optional: Katch–McArdle or Cunningham using LBM.
- Body fat estimators: US Navy circumference; Jackson–Pollock 3-site / 7-site → Siri.
- Energy ↔ weight change: ~7700 kcal per kg heuristic.
- Macro math: Protein 4 kcal/g, Carbs 4 kcal/g, Fat 9 kcal/g.
- Fiber: 14–18 g per 1000 kcal.