Weight Gain Calculator
Calories and timeline to gain weight steadily.
Your result
A surplus of 250–500 kcal with resistance training favours muscle over fat. Gaining about 0.25 kg per week is a sustainable pace.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
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How to Gain Weight in a Healthy Way
A steady calorie surplus with strength training builds muscle rather than just fat.
Weight & Body CompositionHow Many Calories Should You Eat to Lose Weight?
Work out a deficit that is effective without being extreme.
Weight & Body CompositionWhy Weight Loss Plateaus and What to Do
Stalls are normal. Understand why they happen and how to restart progress.
Frequently asked questions
What does the Weight Gain Calculator do?
Calories and timeline to gain weight steadily. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: how to gain weight; bulking calories; gain muscle mass; underweight diet plan.