Calorie Surplus Calculator
Estimate your daily calorie target for healthy weight gain using body metrics, activity, and weekly gain goals.
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Formula
How it works: The calculator estimates maintenance calories from age, weight, height, gender, and activity, then adds a surplus based on your target weekly gain.
Worked Example
How a Calorie Surplus Works
A calorie surplus means eating more calories than your body burns. This extra energy supports weight gain, and when paired with resistance training and sufficient protein, it can help support muscle growth.
- Maintenance calories are your estimated daily calories to keep body weight stable
- A moderate surplus of about 150 to 300 calories per day is often used for leaner, slower weight gain
- Larger surpluses can speed up weight gain, but they usually increase fat gain as well
- Tracking body weight for 2 to 3 weeks is the best way to confirm whether your target is realistic
Use this estimate as a starting point, then adjust based on your real weekly rate of gain, training quality, and recovery.
You can also calculate changes using our Calorie Calculator, Macro Calculator, TDEE Calculator or Protein Needs Calculator.
Frequently Asked Questions
How many extra calories do I need to gain weight?
A common starting point is 150 to 300 extra calories per day for slower, leaner gains, or around 250 to 500 calories per day for faster weight gain depending on your goal.
Is a bigger surplus always better?
No. A very large surplus often leads to more body fat gain without meaningfully improving muscle growth. A steady, moderate surplus is usually more efficient.
How fast should I gain weight?
Many people aim for about 0.25 to 0.5 pounds per week for leaner gains. Faster rates can work, but they usually come with a higher chance of gaining extra body fat.
Should I use this with a protein calculator?
Yes. Calories set the energy target, while protein supports recovery and muscle growth. Pairing this with a protein or macro calculator creates a more complete nutrition plan.
Medical Disclaimer
This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.
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