There is no single “correct” weight for a 13‑year‑old girl; it depends a lot on height, body type, and puberty stage. Average numbers can be helpful, but only a health professional can tell what is healthy for a specific person.

Typical weight range

For 13‑year‑old girls, large studies using CDC growth charts show that many fall roughly between about 76 and 148 pounds (around 34 to 67 kilograms). The middle (50th percentile) value is about 101 pounds (about 46 kilograms), meaning half of girls this age weigh less and half weigh more.

Why height and puberty matter

Healthy weight depends strongly on height: a taller 13‑year‑old will usually have a higher healthy weight than a shorter 13‑year‑old. Puberty timing, genetics, muscle vs. fat, and even things like sports and nutrition all change what a healthy weight looks like at this age.

Average vs. healthy

Doctors typically use growth charts and BMI‑for‑age to see whether a teen is underweight, in a healthy range, overweight, or obese, instead of relying on one “should weigh” number. Being above or below the average is not automatically unhealthy; what matters is the overall pattern of growth, health, energy, and how weight compares with height over time.

Simple reference table

Here is a simplified view of weight percentiles for 13‑year‑old girls (all can be normal depending on height and body type).

Percentile| Approx. weight (lb)
---|---
5th| 76 lb 17
25th| 89 lb 17
50th| 101 lb 137
75th| 116 lb 17
95th| 148 lb 17

What to do if you’re worried

If you (or someone you’re asking for) are worried about weight, the best step is to talk with a pediatrician, family doctor, or school nurse who can check height, weight, growth charts, and overall health together. Try to focus on healthy habits—regular movement, balanced meals, enough sleep—and on how the body feels and functions, not just the number on the scale.