At 13, you’re right in the window where your body is growing the fastest it will since infancy. About 80% of your final height is determined by the genes you inherited from your parents, but the remaining 20% comes from how you eat, sleep, and move during these years. That means there are real things you can do right now to make sure you reach your full potential height, even though you can’t change your DNA.
How Much Taller You Can Still Get
Your bones grow from soft areas near their ends called growth plates. These plates stay open throughout adolescence and gradually harden and close, which is when you stop getting taller. For girls, growth plates begin fusing between ages 14 and 17, with nearly all girls fully done growing by 19. For boys, fusion happens later, typically between 15 and 18, with all growth plates closed by around age 21.
The fastest growth happens during what’s called peak height velocity. For girls, this burst usually hits between about 11.5 and 12 years old. For boys, it comes later, around 13.5 to 14. So if you’re a 13-year-old boy, your biggest growth spurt may be just starting or right around the corner. If you’re a 13-year-old girl, you’ve likely already experienced your fastest growth phase but still have a few years of slower growth ahead.
Estimate Your Adult Height
A simple formula doctors use: add your mother’s and father’s heights together in inches. If you’re a boy, add 5 inches. If you’re a girl, subtract 5 inches. Then divide by two. Most people end up within 2 inches of that number. It’s not perfect, but it gives you a reasonable ballpark. If both your parents are 5’6″, for example, a boy would land around 5’8″ plus or minus 2 inches.
Nutrition That Supports Growth
Your body needs raw materials to build bone and muscle. The three nutrients that matter most for height during adolescence are protein, calcium, and vitamin D.
Protein provides the building blocks for new tissue. The recommended intake for 9- to 13-year-olds is about 34 grams per day, jumping to around 52 grams for boys and 46 grams for girls once you hit 14. That’s roughly equivalent to a chicken breast and a cup of Greek yogurt. Spreading protein across meals (rather than loading it all at dinner) helps your body use it more efficiently. Good sources include eggs, lean meat, fish, beans, dairy, and nuts.
Calcium is the mineral your bones are built from, and at your age you need 1,300 milligrams per day. That’s the highest calcium requirement of any age group. Three servings of dairy gets you close: a glass of milk has about 300 mg, a cup of yogurt around 300 mg, and a slice of cheese roughly 200 mg. If you don’t eat dairy, fortified orange juice, tofu made with calcium, and leafy greens like broccoli and kale can help fill the gap.
Vitamin D helps your body absorb that calcium. The recommendation for 13-year-olds is 600 IU per day. Your skin makes vitamin D from sunlight, but many teens don’t get enough, especially during winter or if you spend most of your time indoors. Fatty fish like salmon, fortified milk, and eggs contain vitamin D. If your diet is low in these foods, a supplement is a simple fix.
Why Sleep Is Non-Negotiable
Growth hormone is the main chemical signal that tells your bones to grow longer. Your body releases its largest surge of growth hormone shortly after you fall into deep sleep. In studies measuring blood levels overnight, this initial peak is by far the biggest of the night, lasting 1.5 to 3.5 hours. Smaller bursts happen during later deep sleep cycles, but if you cut your sleep short, you miss those entirely.
The timing matters too. When researchers delayed subjects’ bedtimes, the growth hormone peak shifted later as well. It’s tied directly to when deep sleep begins. If you stay up until 1 a.m. scrolling your phone, you’re not just tired the next day; you’ve pushed back and potentially shortened the window when your body does its most intense growing. Most sleep guidelines recommend 8 to 10 hours per night for 13-year-olds. Consistent bedtimes help your body settle into deep sleep faster.
Exercise That Helps (and Won’t Stunt Growth)
You may have heard that lifting weights stunts your growth. Research doesn’t support this. A review in the British Journal of Sports Medicine found no evidence that resistance training negatively impacts height during childhood or adolescence. No properly supervised study on youth weightlifting has ever reported a growth plate injury. The concern comes from the theoretical risk of a traumatic injury to the growth plate, which is possible with any sport, not just weight training. Using proper form and reasonable weights makes the risk very low.
Physical activity in general supports growth by stimulating hormone release, improving bone density, and maintaining a healthy body weight. Running, swimming, basketball, soccer, and gymnastics all work. There’s no specific exercise that will make you taller beyond your genetic potential, but staying active helps ensure you reach it.
Stand Taller With Better Posture
Poor posture can cost you an inch or more of visible height. Slouching compresses your spine, rounds your shoulders forward, and tilts your pelvis in ways that make you look shorter than you are. Fixing this won’t change your skeleton, but it lets you display the full height you already have.
A few exercises that help correct rounded posture over time:
- Cat-Cow: On all fours, alternate between arching your back upward and letting it sink toward the floor. This builds spinal mobility and relieves tightness.
- Chest openers: Clasp your hands behind your back and gently lift your arms while squeezing your shoulder blades together. This reverses the forward hunch that comes from sitting at a desk or looking at a phone.
- High planks: Hold a push-up position with straight arms. This strengthens your core and back, which are the muscles that hold you upright.
- Glute bridges: Lying on your back with knees bent, lift your hips toward the ceiling. This corrects pelvic tilt and supports lower back alignment.
Doing a few of these daily for 10 to 15 minutes can noticeably improve how tall you look within weeks, and the core strength carries over into sports performance.
What You Can’t Control
No supplement, stretching routine, or hanging exercise will push you past your genetic ceiling. Products marketed as “height boosters” are not supported by evidence. The 80% genetic component means your parents’ heights are the strongest predictor of where you’ll end up, and no amount of nutrition or sleep will override that blueprint. What good habits do is make sure you hit the top of your personal range rather than falling short of it.
Signs Growth May Need Medical Attention
Most kids who feel short at 13 are simply on a different timetable. Late bloomers, especially boys, often catch up between 15 and 18. But some patterns are worth bringing to a pediatrician: if you’ve grown less than 2 inches per year for several years during what should be a growth period, if you’re significantly shorter than both parents were at the same age, or if puberty hasn’t started by 14 in girls or 15 in boys. A doctor can check your growth plate status with an X-ray and test hormone levels if needed. Growth hormone deficiency is uncommon but treatable when caught early enough that growth plates are still open.