Bone Health Intake Calculator

Estimate your calcium and vitamin D intake against UK reference values and get personalised recommendations for bone health.

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Age (years)

Sex at birth

Sun exposure (Apr–Sep)

Dairy servings/day

Milk/dairy type

Oily fish (portions/wk)

Fortified foods/day

Calcium supplement (mg/day)

Vitamin D supplement (mcg/day)

Additional factors

Post-menopausal

Previous fragility fracture

Long-term steroid use

Calcium Adequate · 963 mg / 1000 mg

Vitamin D Borderline · 7 mcg / 10 mcg

Risk factors

·Vitamin D borderline — consider 10 mcg/day supplement (especially Oct–Mar)

Recommendations

·NHS recommends everyone considers 10 mcg (400 IU) vitamin D daily in autumn and winter; those with limited sun exposure should supplement year-round
·Regular weight-bearing exercise (walking, dancing, resistance training) supports bone strength at any age

Key food sources

Food	Calcium	Vit D
Semi-skimmed milk (200 mL)	~245 mg	Trace
Low-fat yoghurt (125 g)	~200 mg	Trace
Hard cheese (30 g)	~240 mg	Trace
Tinned sardines with bones (100 g)	~460 mg	~6 mcg
Salmon (100 g, cooked)	~50 mg	~8 mcg
Fortified breakfast cereal (30 g)	~150 mg	~1.5 mcg
Fortified plant milk (200 mL)	~240 mg	~1.5 mcg
Egg (large, 1)	~25 mg	~2 mcg

This tool uses dietary estimates and population reference values. It cannot measure your actual nutrient status — blood tests are needed for that. Speak to your GP or a registered dietitian for personalised bone health advice.

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Bone Health Intake Calculator

Osteoporosis affects over 3 million people in the UK and is responsible for around 500,000 fragility fractures per year. Adequate calcium and vitamin D intake throughout life — and especially from age 50 onwards — is a primary modifiable risk factor. This tool estimates your likely calcium and vitamin D intake from diet and supplements and compares it against UK reference values.

About this calculator

Reviewed March 2026

Methodology

Calcium estimated from: dairy servings × milk-type calcium content (240–250 mg), oily fish contribution, fortified foods (~80 mg/serving), supplement, and 350 mg background diet assumption. Vitamin D estimated from: sun synthesis (0, 3, or 7 mcg by category), oily fish, fortified foods (~1.5 mcg), and supplement. Status thresholds: adequate ≥80% RNI, borderline 50–79%, low <50%.

Limitations

Calcium estimates use typical food values; actual content varies by brand and preparation.
Sun exposure contribution to vitamin D is highly variable and influenced by skin tone, latitude, clothing, and sunscreen use.
Blood tests are required to confirm actual vitamin D or calcium status.

Disclaimer

This tool provides dietary estimates, not clinical measurements. Blood tests are required to diagnose deficiency.

Sources

See our calculation methodology and editorial standards for how this estimate is produced.

Calcium and vitamin D: why both matter

Calcium is the primary mineral component of bone. The UK Reference Nutrient Intake (RNI) is 700 mg/day for adults, but NHS guidance recommends 1,000 mg/day for adults aged 50 and over to support bone maintenance in the context of age-related bone loss. Three servings of dairy or fortified dairy alternatives per day provide approximately 700–750 mg of calcium.

Vitamin D is essential for calcium absorption in the gut. Without adequate vitamin D, calcium absorption falls from approximately 30–40% to as low as 10–15%, regardless of intake. In the UK, sunlight-mediated vitamin D synthesis is insufficient for most adults between October and March, leading the Scientific Advisory Committee on Nutrition (SACN) to recommend 10 mcg (400 IU) of vitamin D supplementation daily for all adults — and year-round for those with limited sun exposure.

Frequently asked questions

What is a DEXA scan?

A DEXA (dual-energy X-ray absorptiometry) scan measures bone mineral density. It is used to diagnose osteoporosis and assess fracture risk. In the UK, DEXA scans are typically recommended for postmenopausal women, men over 50, and anyone with significant risk factors such as steroid use or a previous fragility fracture.

Can I get too much calcium from supplements?

Yes. The NHS advises that calcium supplements should not be taken in excess of what is needed to reach dietary targets. Very high supplemental calcium (above 1,500 mg/day) has been associated with a modestly increased cardiovascular risk in some studies. Food sources of calcium are preferable; supplements should fill specific gaps.

Bone Health Intake Calculator

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Bone Health Intake Calculator

Calcium and vitamin D: why both matter

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