Fitness Assessment Score Calculator

BMI can be unhealthy in either direction, so the calculator checks it against a full range — inside the healthy band scores 3, and values either too low (underweight) or too high (obese) both score 1, with a middle zone scoring 2. Curl-ups, push-ups, sit-and-reach, and back extension are all strength or flexibility measures where more is generally better up to a point, so they only need a "needs improvement" floor and a "healthy fitness zone" floor to classify.

Both thresholds step up at ages 9 and 13 to reflect typical strength development: for boys, the curl-up HFZ threshold moves from 12 (age ≤9) to 18 (ages 10-13) to 24 (ages 14+), and push-ups follow a similar three-step pattern. Girls have their own, generally lower, thresholds at the same age breakpoints. That means the same raw rep count can score differently for a 9-year-old than a 13-year-old.

In this implementation those two components use fixed thresholds regardless of age — sit-and-reach is judged against 20/23 cm for boys or 20/25 cm for girls, and back extension against a flat 6/9-second threshold for everyone. It's a simplification of the real FITNESSGRAM tables, which do vary flexibility norms somewhat by age; treat those two scores as a rougher approximation than the strength components.

Each of the five components (BMI, curl-ups, push-ups, sit-and-reach, back extension) is rated 1, 2, or 3, and the composite is simply the sum of those five ratings divided by the maximum possible 15, expressed as a percentage. A student in the Healthy Fitness Zone on all five scores 100%; a student at health-risk or needs-improvement on everything scores much lower — it's a summary index, not a percentile rank against other students.