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Use this weight gain calculator for a clear health & fitness estimate. Results update instantly in your browser.
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
The defaults provide a complete worked example. Change any value to recalculate the result and any schedule shown.
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.