Tool
Weight Gain Calculator
Estimate maintenance calories plus a modest surplus that may support gradual gain. Not a guarantee.
How this estimate is made
We sketch maintenance with Mifflin–St Jeor and activity, then add about 250–500 kcal. Track weekly weight rather than daily noise.
See the medical disclaimer. Track a plan in the Fitkyn app. Browse all tools or health guides.
Frequently asked questions
Is this medical advice?
No. Results are population estimates. Discuss medical conditions, pregnancy, eating disorders, or medications with a qualified healthcare professional.
Why might my number differ from another site?
Equations, activity factors, and rounding differ. Treat every calculator as a sketch.
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