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Health & Fitness

Calorie Surplus Estimator

Plan a modest calorie surplus for gradual weight or muscle gain, with daily intake and an estimated timeline.

Your inputs

Results

Daily intake

2,775 kcal/day

Daily surplus
275 kcal/day
Estimated time to goal
20 weeks

≈Estimate based on the stated model and assumptions

Notes for this result

  • This is a population-level estimate for adults, not a diagnosis. Discuss health decisions with a qualified professional.
  • Slower gain (around 0.25–0.5 % of body weight per week) generally limits fat gain when the aim is muscle.

Inputs are never added to links for financial, salary or health calculators.

What this calculator does

Gaining weight, especially muscle, works best with a modest surplus combined with resistance training and adequate protein.

Formula and method

Daily surplus = weekly gain × 7,700 ÷ 7; Intake = TDEE + surplus

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Your TDEE (maintenance calories): 2500 kcal/day
  • Target gain per week: 0.25 kg
  • Current weight: 70 kg
  • Goal weight: 75 kg

Results

  • Daily intake: 2,775 kcal/day
  • Daily surplus: 275 kcal/day
  • Estimated time to goal: 20 weeks

How to read the results

Smaller surpluses generally limit fat gain when muscle is the goal.

Assumptions and limitations

  • An estimate for healthy adults, not a diagnosis or medical advice. Consult a qualified health professional about your personal situation.

Health results are general estimates for adults and do not replace medical advice, diagnosis or treatment. Speak to a qualified health professional about your personal situation, especially during pregnancy or if you have a medical condition.

Questions

How fast should I gain?

Around 0.25–0.5 % of body weight per week is a common target for lean gain.

Methodology and verification

Result type
Estimate based on the stated model and assumptions
Formula version
1.0
Automated verification
2 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy