How Much Do Boys Grow After Their Voice Changes?
Most boys grow another 2 to 4 inches after their voice starts changing. Here is why the two are linked, and when to expect the growth to be mostly done.
The short answer
The voice change happens in the middle of the puberty growth spurt, not at the end. Most boys have 2 to 4 more inches of growth after the voice starts noticeably changing. Some late developers get 5-6 inches. Timing:
- Voice usually starts changing when puberty is well underway (Tanner stage 3-4).
- Peak growth velocity typically happens 6-12 months AFTER voice change begins.
- Growth continues at declining rates for another 12-24 months after peak.
- Boys typically reach adult height 2-3 years after voice starts changing.
Why voice change and growth are linked
Both are driven by rising testosterone during puberty. Testosterone causes the larynx to enlarge (voice deepens) and simultaneously accelerates bone growth at the growth plates. The two happen in the same phase, but the growth arc lasts longer than the voice change arc.
Ranges by developer type
- Early developer (voice change around 11-12): often only 2-3 inches after voice change, because he started his spurt earlier and is closer to his ceiling.
- Typical developer (voice change 12-14): 3-4 inches ahead after voice change is common.
- Late developer (voice change 15+): can get 4-6 inches after voice change, because the whole timeline is compressed later.
How to tell where he is
- Voice just cracking occasionally: he is at the start of the change. Most of the growth is ahead.
- Voice noticeably deeper but still shifting: he is in the middle of it. 1-3 inches probably ahead.
- Voice fully settled at adult pitch: he is close to done. 0-2 inches probably ahead.
Bone age is the definitive test
If you want a real answer instead of a range, ask his pediatrician about a bone age x-ray. It compares his skeletal maturity to standardized references and gives a specific estimate of remaining growth. Most useful before growth-plate closure (typically before age 17 for boys).
What supports the remaining growth
- Sleep. Growth hormone peaks during deep sleep. 8-10 hours matters.
- Nutrition. Undernutrition during the growth spurt can shave inches off the outcome.
- Treating chronic issues (thyroid, celiac, undiagnosed conditions).
- Not smoking or vaping. Both are associated with reduced adult height.
Nothing else has meaningfully changed adult height in a healthy boy. Over-the-counter "growth boosters" have no evidence behind them.
Height data uses the CDC 2000 Growth Charts for boys. This page is parent education, not medical advice or diagnosis. If you have concerns about your son's growth, talk to his pediatrician, ideally with 6-12 months of measurements in hand. © 2026 The Growth Path.