Estimate how much energy your body has left after exercise to support training, recovery, and normal physiological function.
Takes about 90 seconds. Your personalised results require an email.
Based on
Loucks et al.
Useful for
Spotting under-fuelling patterns
Built by
JJB Performance
Step 1 of 4
Your body composition
We need your weight and approximate body fat percentage to calculate fat-free mass — the denominator in the energy availability equation.
Most women range 20–35%. A DEXA scan gives the most accurate number, but an estimate works here.
Step 2 of 4
Daily energy intake
Your average daily calorie intake. If you track, use that number. If not, estimate as best you can.
Step 3 of 4
Your training
Select every type of exercise you do in a typical week, then set duration and frequency for each.
Assessment Complete
Your personalised result is ready
Enter your details below. We’ll send a confirmation link first, then your complete Energy Availability result will be emailed immediately after you confirm.
Your full report includes:
✓
Complete breakdown of your numbers (FFM, intake, expenditure)
✓
What your score means for hormonal health and performance
✓
Under-fuelling warning signs that are easy to miss
✓
A step-by-step intake adjustment framework
By continuing, you agree that JJB Performance can process your calculator answers to email your personalised result and relevant education, including The Stronger Life newsletter. Unsubscribe at any time.
One More Step
Check your inbox
We’ve sent a confirmation email to . Click Confirm and Get My Result and your personalised report will be sent immediately.
Can’t see it?
Allow a few minutes, then check your spam, junk or promotions folder. Search for “Your Energy Availability result is ready”.
Email Confirmed
Your result is on its way
Thank you for confirming. Your personalised Energy Availability report should arrive in the next few minutes.
What happens next
Open your result email for your score and breakdown. Over the next week, I’ll also explain the warning signs most women miss and how to adjust intake without guesswork.