Osteoporosis Risk Calculator: Understand Your 10-Year FRAX Fracture Risk
Worldwide, around 200 million people have osteoporosis — most of them post-menopausal women. Each year, osteoporosis causes more than 9 million fragility fractures globally, including 1.6 million hip fractures with high morbidity and mortality. Yet osteoporosis is largely preventable and treatable — once it is recognized.
This guide shows how to estimate your 10-year fracture risk with a FRAX-inspired score — without bone density (DXA) imaging, but precise enough to flag the need for clinical assessment.
What is osteoporosis?
Osteoporosis is a systemic skeletal disease with reduced bone mass and disrupted micro-architecture. Bones become brittle — typical fracture sites are spine, hip, wrist, and humerus. About one in three women over 50 will experience an osteoporotic fracture in her remaining lifetime.
The diagnosis is based on bone density (BMD) measured by DXA at the femoral neck and lumbar spine. The T-score compares your BMD to that of young healthy adults: T ≤ -2.5 meets the WHO definition of osteoporosis, while -2.4 to -1.0 is osteopenia (a precursor state).
FRAX — the gold standard for risk estimation
The WHO developed FRAX (Fracture Risk Assessment Tool), an algorithm that calculates the 10-year probability of major osteoporotic fracture from 11 clinical risk factors — optionally including bone density. FRAX underpins the treatment guidelines of NOF (USA) and DVO (Germany).
Our calculator translates FRAX logic into a simple point score — ideal as a pre-screen before getting a DXA scan.
The 11 most important risk factors
| Risk factor | Points | Why it matters |
|---|---|---|
| Age | 0–7 | Strongest non-modifiable factor |
| Female sex | +1 | Estrogen loss after menopause |
| BMI < 19 | +2 | Underweight reduces bone mass |
| Previous fracture | +3 | Strongest modifiable predictor |
| Parent hip fracture | +2 | Strongest genetic factor |
| Smoking | +1 | Inhibits osteoblasts, impairs healing |
| Glucocorticoids ≥ 3 mo | +2 | #1 cause of secondary osteoporosis |
| Rheumatoid arthritis | +1 | Inflammation plus glucocorticoids |
| Secondary causes | +1 | Type 1 diabetes, hyperthyroidism, early menopause |
| Alcohol ≥ 3 units/day | +2 | Inhibits osteoblasts, raises fall risk |
| T-score (DXA) | 0–3 | Optional, when bone density is known |
Calculate your osteoporosis risk now
FRAX-based 10-year fracture risk from age, BMI, and 8 risk factors — instant, anonymous, no sign-up.
Try the calculator →When is treatment indicated?
Most guidelines recommend pharmacologic therapy when the 10-year major fracture risk exceeds 20 % — corresponding to ≥ 8 points in our calculator. Other clear treatment indications:
- DXA T-score ≤ -2.5
- Prevalent vertebral fracture (radiographically confirmed)
- Hip fracture without adequate trauma
- Long-term glucocorticoid therapy ≥ 7.5 mg prednisone equivalent
Treatment options
- Bisphosphonates (alendronate, risedronate, zoledronate): first-line, oral or IV, reduce fracture rates by ~50 %.
- Denosumab: anti-RANKL antibody every 6 months SC — caution when stopping (rebound fractures).
- Teriparatide: PTH analog, anabolic, for severe osteoporosis with high fracture risk.
- Romosozumab: sclerostin antibody, dual-acting, an option for very high risk.
- Baseline therapy: always 1000 mg calcium and 800–1000 IU vitamin D — see our vitamin D calculator.
Prevention: what you can do
- Weight-bearing & resistance exercise: 2–3× per week, ideally with jumping or strength training against resistance.
- Protein: 1.0–1.2 g per kg body weight, evenly spread across the day.
- Calcium: 1000 mg/day, ideally from dairy and calcium-rich water.
- Vitamin D: 800–1000 IU/day, more if deficient or with low sun exposure.
- Fall prevention: check vision, wear non-slip footwear, secure your home.
- Avoid: tobacco, alcohol > 2 units/day, sustained underweight.
Related calculators
Bone health is tied to other metabolic and lifestyle factors. The vitamin D calculator helps you set the right dose for adequate calcium absorption. The biological age calculator gives a holistic view of your aging trajectory — bone and muscle mass are part of it. And if you are underweight, start with the BMI calculator — low BMI is an established fracture risk factor.
Bottom line
Osteoporosis develops silently over years — the first fracture is often the first symptom. With our osteoporosis risk calculator you can see in seconds whether a DXA scan is warranted. Early diagnosis combined with consistent baseline and (when needed) pharmacologic therapy demonstrably halves fracture incidence.