Weight Gain Calculator
Estimate a calorie target and arithmetic timeline from current weight, goal weight and a chosen surplus without promising lean-mass gain.
Enter or adjust the values above, then calculate.
Weight Gain: calorie Surplus & Approximate Timeline
Estimate a calorie target and arithmetic timeline from current weight, goal weight and a chosen surplus without promising lean-mass gain.
Inputs this tool uses
- Current weight
- Goal weight
- Estimated TDEE
- Daily surplus
What you get
Approximate planning target; about 31 weeks by simple energy arithmetic.
How to use the Weight Gain Calculator
- Enter current weight, goal weight, estimated tdee and the other fields relevant to this calculation.
- Select any method, activity level or option shown on this page, then choose Calculate.
- Read the main result together with the supporting values, method, assumptions and limitations below before using the estimate.
How this calculation works
Calorie-goal tools use arithmetic differences from entered maintenance energy. Any 7,700 kcal/kg weight-change conversion is shown only as an approximation.
Example calculation
The sample values loaded into the calculator produce 2450 kcal/day. This example exists to show how the output is structured; replace the sample values with your own inputs for your calculation.
Assumptions and limitations
- Energy and nutrient outputs are estimates or general reference values, not individualized treatment targets.
- Adult calorie-goal tools should not be used for children, pregnancy or medical nutrition therapy unless the page explicitly supports that life stage.
Sources and review status
Source set last verified 2026-09-25. No clinician review is claimed unless a real named reviewer is displayed.
Questions people ask about Weight Gain Calculator
Does a calorie surplus guarantee muscle gain?
No. A calorie surplus can support weight gain, but this calculator cannot predict how much will be muscle, fat or water.
Connected tools
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