Average Weight for Boys by Grade (9th–12th): Percentile Ranges

Weight varies by genetics, nutrition, and activity. Below are approximate percentile ranges (kg / lbs):

Grade	5th %ile	50th %ile (median)	95th %ile
9	47.6 / 105	61.2 / 135	77.1 / 170
10	53.5 / 118	68.0 / 150	85.7 / 189
11	59.0 / 130	74.8 / 165	94.3 / 208
12	64.0 / 141	81.6 / 180	102.9 / 227

These are population guidelines; consult a healthcare provider for individual assessment.