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Athlete Calorie Needs Calculator

Work out athlete calorie needs instantly with clear inputs, formula shown and shareable results.

About Athlete Calorie Needs Calculator

Scales energy needs to fat-free mass, the approach used in sports nutrition to avoid low energy availability.

Formula

Athlete energy needs

Daily energy = fat-free mass (kg) x kcal per kg FFM, typically 40 to 60 depending on training load

Worked example

With the default values below, Athlete Calorie Needs Calculator returns Daily energy needs of 3,080. Change any input above and every figure here is recalculated in your browser.

Inputs used

Weightaccepts 35–200 kg
70 kg
Body fataccepts 3–40
12
Training hours per weekaccepts 0–40
12
Energy target per kilogram of lean massaccepts 30–80 kcal/kg FFM
50 kcal/kg FFM

Results

Daily energy needs
3,080 kcal/day
Fat-free mass
61.60 kg
Energy per kilogram of body weight
44.00 kcal/kg
Indicative training energy per day
449 kcal

Step by step

  1. 1Values used
  2. 2Athlete energy needs
  3. 3Daily energy needs= 3,080 kcal/day
  4. 4Fat-free mass= 61.60 kg
  5. 5Energy per kilogram of body weight= 44.00 kcal/kg
  6. 6Indicative training energy per day= 449 kcal

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

What is low energy availability?

Energy availability below about 30 kcal per kg of fat-free mass a day, which disrupts hormones, bone and performance.

Why index to lean mass?

Fat tissue contributes little to energy expenditure, so lean mass is the better scaling variable in lean athletes.

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