Protein and calcium for teens: how much, and from what

How much a day

These are the US Dietary Reference Intakes, the targets most nutrition guidance is built on:

Protein scales with weight, so work it out for yourself:

Calcium doesn’t scale: 1300 mg is the target for everyone from 9 to 18, more than adults need, because the skeleton is building so fast. Vitamin D helps the body absorb calcium; the target for this age is 600 IU (15 micrograms) a day.

Why these two

Most of the bone mass you will have as an adult is laid down by the end of your teens. Calcium is what bone is built from, and protein supplies the framework it sits on and the muscle growing alongside it. Neither will push height past what your genes allow. The point is building strong bones, and most of that happens now.

In practice protein is rarely the problem: most teens who eat regular meals with some meat, fish, eggs, dairy, beans or tofu get enough. Calcium is the one that often falls short, especially for teens who don’t drink milk or eat dairy.

What that looks like in food

Approximate values for common portions, from the USDA’s food database. Brands and recipes vary, so check labels where you can.

Two things stand out. Meat and eggs are great for protein and add almost no calcium. Dairy, calcium-set tofu and canned fish with their soft bones do most of the calcium work. Tofu varies the most: the table’s value is for firm tofu set with calcium sulfate, and other tofu can have a fraction of it, so check the label. Many plant drinks and some juices have calcium added; the label says how much.

A day that covers both

For the 16-year-old above (51 g of protein, 1300 mg of calcium):

Without the yogurt and the milk, the same day still has plenty of protein but only about 720 mg of calcium, a little over half the target. That is the usual pattern: calcium needs a plan, protein mostly looks after itself. And you don’t need to hit the numbers exactly every day; aim for most days.

Supplements

Food first. Most teens can reach both targets with ordinary meals, and food brings everything else bones need along with it. Protein powders aren’t necessary for teens who eat regular meals. If you don’t eat dairy or calcium-rich alternatives and can’t make the numbers work, talk to a doctor or dietitian before starting a calcium or vitamin D supplement.

Keeping count without weighing food

TallPlan’s meal log estimates the protein and calcium in a meal from a photo or a few words, such as “two eggs, toast and a glass of milk”, and counts it toward your targets for the day. It is an estimate you can correct, not a lab result, and meal analysis is part of Premium. If you have a health condition or a special diet, follow your doctor’s advice over any app.

Sources

1. Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. National Academies Press, 2005.
2. Institute of Medicine. Dietary Reference Intakes for Calcium and Vitamin D, summary tables. National Academies Press, 2011.
3. Weaver CM, et al. The National Osteoporosis Foundation’s position statement on peak bone mass development and lifestyle factors. Osteoporosis International, 2016.
4. American Academy of Pediatrics, HealthyChildren.org. A teenager’s nutritional needs.
5. American Academy of Pediatrics, HealthyChildren.org. Calcium: the bone builder kids and teens need.
6. MedlinePlus. Calcium in diet.
7. USDA. FoodData Central (SR Legacy), for the food values.

Written by the TallPlan team. Last checked October 9, 2026. Spotted a mistake? Tell us.