A small handful of almonds – roughly 30g – delivers around 80mg of calcium. For a UK adult whose daily target is 700mg, that works out at about 11% of the recommended intake. It is a useful contribution, but nutritionists caution that almonds alone cannot cover the body’s calcium needs and should be seen as part of a broader, varied diet.
How much calcium do you need each day?
The NHS advises that adults aged 19 to 64 require 700mg of calcium per day. For those at risk of osteoporosis or undergoing treatment for the condition, the figure may rise to around 1,000mg. Women who have been through menopause and men over the age of 55 are advised to aim for 1,200mg daily. In the United States, the general recommendation for most adults is 1,000mg, with 1,200mg for older adults. Exceeding 1,500mg of calcium per day from supplements is not generally recommended and can lead to stomach pain and diarrhoea, according to health authorities.
The calcium content of almonds is often expressed per 100g – around 269mg – but that portion is large and calorie-dense. Few people eat 100g of almonds in one sitting. A more realistic serving is the small handful used above, which provides roughly 80mg. For context, ten almonds deliver about 30mg of calcium, depending on their size. The presence of oxalates and phytates in almonds can also reduce the body’s absorption of the mineral, meaning the net gain may be lower than the headline number suggests.
How almonds compare with other calcium sources
In normal serving sizes, almonds do not match dairy foods or fortified alternatives. A standard 200ml glass of cow’s milk contains around 240mg of calcium – three times the amount in a handful of almonds. A 30g portion of cheddar cheese provides roughly 220–250mg, and a 125g pot of low-fat fruit yoghurt can offer about 175mg. Tinned fish with bones, such as sardines and pilchards, are also rich sources.
For those who avoid dairy, fortified plant milks can offer comparable levels. However, the situation is more complex than simply swapping one drink for another.
Fortified almond milk: a matter of labels
Almond milk is mostly water and a small proportion of almonds. The calcium it contains does not come naturally from the nuts; it is added during processing. That makes the distinction between fortified and unfortified versions critical. Unfortified almond milk may contain very little calcium. Fortified versions, on the other hand, can provide around 120mg of calcium per 100ml – similar to cow’s milk. But the figure varies widely by brand, and not all cartons are equal.
The key word to look for on packaging is “fortified”. Organic almond milks are typically not fortified, so consumers who buy organic may miss out on calcium unless they check the nutrition table carefully. Front-of-pack claims can be misleading; the back-of-pack nutritional information is the reliable guide. A product labelled as a “source of calcium” must contain at least 15% of the Reference Intake per 100g under UK regulations, but this still allows significant variation.
The type of added calcium also matters. Common additives include calcium carbonate and calcium phosphate. Calcium carbonate is widely used in fortified foods and drinks and can contribute to intake, but its absorption may differ from naturally occurring calcium in dairy. Factors such as the precise form of calcium, how well the drink is mixed, and individual physiology all affect how much the body actually uses. The original research notes that absorption can vary depending on the product, and the drink should be shaken well before pouring to ensure the added calcium is evenly distributed.
Fortified almond milk can be a helpful option for those who do not consume cow’s milk, but it is not identical to whole-food sources. It also tends to be lower in protein than cow’s milk or soya milk.
Almond butter and other almond products
Almond butter, made from ground almonds, retains the nut’s calcium. A 100g portion contains approximately 347mg of calcium, but a typical serving is one or two tablespoons. Actual figures vary by brand and production method. For example, a 16g serving might deliver between 42mg and 55.5mg, depending on the product. Almond butter is calorie-dense – a tablespoon is close to 100 calories – so it is best used as a nutritious addition rather than a primary calcium source.
In the UK, non-wholemeal wheat flour is mandatorily fortified with calcium carbonate under the Bread and Flour Regulations 1998. This means bread and other products made from fortified flour also contribute to calcium intake, a factor worth considering when planning a balanced diet.
Who should be cautious with almonds?
Almonds are tree nuts, so anyone with a confirmed tree nut allergy should avoid them unless advised otherwise by a medical professional. Whole almonds pose a choking risk for young children and should be served in a safe form. Because almonds are calorie-dense, large portions can add excess calories quickly. Their fibre and fat content can also cause digestive discomfort in some people. Unsalted almonds are the preferable everyday choice for those watching their salt intake.
Almonds are high in oxalates, which can contribute to the formation of calcium oxalate kidney stones in susceptible individuals. Anyone with a history of such stones, or who has been advised to limit high-oxalate foods, should consult a doctor or dietitian.
Practical advice for using almonds as part of a calcium-rich diet
Health experts recommend treating almonds as a helpful addition rather than the foundation of calcium intake. A handful of unsalted almonds can be incorporated into meals alongside higher-calcium foods – for example, chopped over yoghurt, sprinkled on porridge made with fortified milk, or spread as almond butter on wholegrain toast with a calcium-rich topping. If almond milk is the choice, select a fortified version, check the nutrition label thoroughly, and shake the carton before use. The same caution applies to any homemade almond milk, which will be low in calcium unless calcium is added deliberately.
