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What this calculator does
Estimate calorie surplus needed for a planned weight-gain goal.
How to use this calculator
- Enter current weight, target, and timeframe.
- Review the calculation assumptions before using the result.
- Use the result to plan gradual progress.
How to calculate
Choose the calculation mode where available, then enter the values requested by the weight gain calculator. Results update immediately.
Worked example
With the example values shown above, the maintenance calories is 2,507 kcal/day, and the weight-gain calorie target is 2,782 kcal/day, and the daily surplus is 275 kcal/day.
Understanding your result
Use the result to plan gradual progress.
- Weight change includes water and lean mass, not only fat.
- Double-check values and units before calculating.
This calculator provides an educational estimate and is not medical advice or a diagnosis.
Frequently asked questions
What does this weight gain calculator do?
Estimate calorie surplus needed for a planned weight-gain goal.
How do I use this weight gain calculator?
Enter current weight, target, and timeframe.
What does the result mean?
Use the result to plan gradual progress.
What should I check before relying on it?
Weight change includes water and lean mass, not only fat.
Why does a stricter pace require eating more?
A faster weight-gain target needs a larger daily calorie surplus above your maintenance calories to produce that higher weekly rate of gain.
Will all the weight gained be muscle?
Not automatically — a calorie surplus alone doesn't determine what kind of weight is gained. Strength training alongside adequate protein intake is generally what shifts more of a surplus toward muscle rather than fat.