Weight Gain Planner
Rough mass gain projection from a calorie surplus model.
Use the calculator below, then review the formula, a numeric example, and the reference table to understand how the weight gain planner result is produced.
Educational tool only. It does not replace advice from a licensed clinician, dietitian, or exercise physiologist.
Calculator inputs
Result
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What is this calculator?
Rough mass gain projection from a calorie surplus model. The formula, a worked example, and a reference table are below. Results are for education only, not medical advice.
How it works
Rough mass change (kg) ≈ (daily surplus kcal × 7 × weeks) ÷ 7700 (fat-mass teaching constant).
Example
300 kcal surplus, 10 weeks (300×70)/7700 ≈ 2.7 kg rough illustration.
Reference Table
| Value | Meaning |
|---|---|
| Surplus size | Small-to-moderate |
| Protein | Adequate g/kg |
| Progressive overload | Training stimulus |
FAQ
All muscle?
No—some fat gain is common; genetics and training matter.
Digestive limits?
Very high intakes are hard to absorb comfortably.
Track strength?
Barbell loads and reps show quality of gain.
Health labs?
Rapid weight change warrants periodic checks.