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Calcium: the daily reference intake

The calcium reference intake peaks at 1 150 mg a day between 11 and 17 years — higher than at any adult age — because that is when the skeleton lays down most of its mineral. Adults sit at 950 mg, and EFSA does not raise it for pregnancy.

These are published population reference values, not a diagnosis and not a prescription. A reference intake describes what covers a healthy group; it cannot tell you your own status, and no page can. Pregnancy, chronic illness, medicines and malabsorption all change the picture — take those questions to a doctor, midwife, pharmacist or dietitian.

Calcium by age, sex and life stage

EFSA sets the highest calcium requirement of the whole life course in adolescence, not in old age, and does not raise it for pregnancy.

The peak is in adolescence, and it does not come back

Roughly the whole adult skeleton is built by the mid-twenties, and the fastest deposition happens during the pubertal growth spurt. That is why EFSA sets 1 150 mg a day for 11 to 17 year olds and 950 mg for adults over 25, with 1 000 mg for the 18 to 24 year olds still finishing the job.

Peak bone mass is the amount you take into the rest of your life. Calcium intake in the teenage years is one of the inputs, along with physical loading, vitamin D status and body weight. It is also the age at which milk is most often dropped in favour of soft drinks, which is why the adolescent figure gets its own page on this site.

Why pregnancy does not raise the number

A pregnancy transfers roughly 25 to 30 g of calcium to the fetus, most of it in the third trimester, and that sounds like it should raise the requirement. It does not, because maternal calcium absorption roughly doubles during pregnancy. EFSA therefore sets the same 950 mg for pregnant women as for other adults. The same argument applies to breastfeeding: bone is mobilised and then restored after weaning.

This is one of the clearest cases where physiology, not arithmetic, sets the reference value — and a good reason to be sceptical of any table that simply adds up losses.

Calcium does not work alone

Absorption depends on vitamin D status: without adequate vitamin D, a large calcium intake is partly wasted. At Nordic and Baltic latitudes that link is not academic, because skin synthesis of vitamin D stops for months at a time. National guidance in Estonia and Finland pairs the two, and this site does the same — the vitamin D page is the companion to this one.

High doses of calcium also compete with iron and zinc for absorption, so a calcium supplement taken with an iron supplement blunts both. Spacing them apart is standard pharmacy advice.

Where it comes from without dairy

Dairy is the densest everyday source, and hard cheeses concentrate it further. Without dairy, the practical routes are small fish eaten with the bones, calcium-set tofu, fortified plant drinks, and to a smaller degree low-oxalate greens such as kale and cabbage. Spinach is high in calcium on paper and a poor source in practice, because its oxalate binds most of it.

The food table below shows one ordinary portion of each against the 950 mg adult figure, so you can see how many portions a day the answer actually is.

The upper level

EFSA tolerable upper intake level for calcium in adults is 2 500 mg a day from all sources combined. Reaching it from food alone is difficult; it is a supplement question.

Ordinary food against the 950 mg adult reference intake

Top of this list: Tofu, 350 mg in a 100 g serving (a slab) — 37% of the 950 mg adult reference intake. It would take about 3 of those to cover a full day from that one food, which is why a real diet spreads it across several rows.

† The calcium in tofu comes from the setting agent. Tofu set with a calcium salt is a strong calcium source; tofu set with magnesium chloride (nigari) carries a fraction of it.

Portion sizes are ordinary household servings chosen for this table, not official reference portions, and the shortlist is an editorial one: everyday foods eaten in this region rather than the highest per-100 g entries in the database. A raw per-100 g ranking would be topped by dried herbs, drink powders and fortified breakfast cereals, which answers a different question. The composition data is American, so where US fortification practice differs from European practice the row carries a dagger and the reason. For the full per-100 g ranking of a nutrient, the food-data section of this site publishes one.

Calcium for one group at a time

For the full ranking of every food in the database by calcium per 100 g, see foods highest in calcium.

Sources: EFSA Dietary Reference Values · Regulation (EU) No 1169/2011, Annex XIII · USDA FoodData Central SR Legacy (food composition) · EFSA scientific opinion on dietary reference values for calcium (2015) · Regulation (EU) No 1169/2011, Annex XIII · checked 2026-09-06

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