FUEL WELL. TRAIN SUSTAINABLY.

Know what remains.

Estimate your energy availability after training and explore what a well-fueled day might look like.

EA = (intake − net exercise expenditure) ÷ fat-free mass
Understand the number. Explore a fuel plan. Support consistent training.
01 / CALCULATE

Your energy, at a glance.

All values describe the same 24-hour period.

Enter your details

Use exercise expenditure above resting expenditure, not all-day calories. If you tick gross, enter exercise duration below to approximate resting energy during exercise.
ESTIMATED ENERGY AVAILABILITY
—
kcal / kg fat-free mass / day
0304560+
Enter your details to see your energy availability.
How does your EA compare?
<30
Low reference
30–<45
In-between
≥45
Higher reference

Illustrative research references, not a health verdict. What the IOC research says ↓

Fat-free mass—
Net exercise expenditure—
Energy after exercise—
Intake at selected EA reference—

162 kcal above entered intake.

This is an estimate, not a diagnosis of LEA or RED-S. Higher EA does not rule out RED-S.

02 / PUT IT ON YOUR PLATE

Fuel your day.

Build your day

Training sessions

Sessions shape meal timing and training fuel. Their durations do not estimate exercise expenditure; enter combined net exercise calories above.

Illustrative meal plan

Daily energy used for plan—
Session carbohydrates—
Estimated meals & snacks—

Example food combinations and calories are approximate. Portion sizes are illustrative, not a tailored dietary prescription. During-session fuel is counted inside your daily total, not added on top. Avoid treating a single-day calculation as a clinical target.

03 / UNDERSTAND THE NUMBER

Understand the science.

What does EA measure?

Energy availability (EA) is the energy left after exercise, relative to fat-free mass. EA = (energy intake − net exercise energy expenditure) ÷ fat-free mass. Unlike calorie balance, the formula does not subtract your resting energy expenditure or ordinary daily activity.

Where do 30 and 45 come from?

Early controlled studies, mainly in sedentary women, found changes in certain physiological markers around or below 30 kcal/kg fat-free mass/day. Around 45 was used as a reference for adequate availability and normal physiological functioning. The IOC describes these as historical research guides, not individual targets or hard cutoffs.

What does the 2023 IOC consensus say?

The IOC describes low energy availability as a continuum: some short-term reductions may be adaptable, while severe or prolonged exposure can become problematic. There is no single EA threshold that reliably diagnoses or rules out REDs for everyone. Individuals and body systems respond differently, and thresholds are even less established in men.

What is REDs?

Relative Energy Deficiency in Sport (REDs) is a clinical syndrome linked to problematic low energy availability. It can affect hormones, bone health, immunity, cardiovascular health, mood, recovery and performance. A calculator result cannot establish whether you have REDs.

Why an estimate isn't a verdict

Food logging, exercise calorie estimates and body-fat measurements can all be inaccurate. A single day also cannot describe the duration or severity of exposure. Symptoms, injury history, training load and clinical assessment matter more than chasing one number.

How should you use this?

Use the number to explore how changes in fueling or exercise affect estimated EA—not as a calorie prescription. Persistent fatigue, poor recovery, menstrual disruption, low libido or recurrent bone stress injuries deserve assessment by a qualified sports dietitian or clinician, regardless of your result.

Source: 2023 IOC consensus statement on Relative Energy Deficiency in Sport (REDs) ↗. The ranges shown above are simplified historical references; they are not validated diagnostic categories.