FRAX Calculator Guide to 10-Year Fracture Risk Scores

How to Read Your FRAX Score

Your FRAX calculation delivers two percentage scores that show your probability of suffering a major osteoporotic fracture or a hip fracture over the next ten years. These two numbers reflect distinct clinical vulnerabilities and guide different types of preventive discussions with your physician.

The first metric is major osteoporotic fracture probability. This percentage estimates your likelihood of breaking a bone in your spine, hip, forearm, or shoulder during typical daily activities or after a minor fall from standing height. The second metric is hip fracture probability, which isolates the risk of breaking the upper portion of the femur. Guidelines evaluate hip risk on a separate, much lower threshold than major osteoporotic fracture risk.

In the United States, the Bone Health and Osteoporosis Foundation establishes clear benchmarks for interpreting these percentages. In postmenopausal women and men aged 50 and older who have low bone mass, treatment is recommended for consideration when the ten-year hip fracture probability is 3% or higher, or when the ten-year major osteoporotic fracture probability is 20% or higher. These figures are guideline reference points that a healthcare provider applies to your broader health profile instead of acting as standalone prescriptions. Other countries utilize different intervention thresholds tailored to their own population health models.

It is also worth noting that these thresholds apply primarily when bone loss is moderate. If a bone scan already shows a T-score of -2.5 or lower, or if you have already sustained a hip fracture or a vertebral compression fracture, medical guidelines already support prescription therapy without requiring a FRAX calculation.

What Goes Into the FRAX Calculator

The FRAX calculator evaluates a set of clinical risk variables alongside age, sex, height, and weight to project skeletal fracture odds. Developed by researchers at the University of Sheffield, the software is freely available online at the official FRAX tool site and is calibrated for adults roughly ages 40 to 90 who are not currently taking prescription bone medications.

The algorithm requests specific details that independently alter the mechanical strength of your skeleton or increase your susceptibility to bone breakdown:

• Age, biological sex, height, and weight:
• Previous fragility fracture: A history of breaking a bone as an adult from minor trauma significantly elevates future fracture odds.
• Parental hip fracture:
• Current tobacco smoking:
• Oral glucocorticoids:
• Rheumatoid arthritis:
• Secondary causes: Medical conditions that contribute to bone weakness, as recognized by the tool's questionnaire.
• Alcohol intake: Consuming three or more units of alcohol per day.
• Femoral neck bone mineral density: An optional entry using the T-score from a dual-energy X-ray absorptiometry (DEXA scan).

A notable advantage of the calculator is that it can run with or without entering a bone density test result. When dual-energy X-ray absorptiometry is unavailable, the tool produces an estimate based entirely on your clinical profile. However, adding your femoral neck bone density T-score sharpens the precision of the calculation, combining physical bone thickness measurements with your lifestyle and genetic background.

FRAX Score and Osteopenia

Clinicians rely on the FRAX score primarily when a bone mineral density test shows osteopenia rather than clear osteoporosis. A bone scan report provides a T-score that compares your bone mass to that of a healthy young adult reference population. A score of -1.0 or higher is considered normal, while a score of -2.5 or lower defines clinical osteoporosis.

The intermediate range between -1.0 and -2.5 is classified as osteopenia, representing low bone mass that has not crossed the diagnostic boundary of disease. Deciding how to manage osteopenia presents a frequent clinical challenge. Relying strictly on a bone mineral density scan leaves clinicians without a clear way to distinguish who in this large group needs prescription support.

The FRAX calculation solves this problem by stratifying risk within the osteopenia category. An individual with a T-score of -1.5 who has no family history and does not smoke will likely generate a low ten-year fracture score, suggesting that conservative lifestyle measures are sufficient. Conversely, an individual with that same -1.5 T-score who has a parent with a hip fracture, a history of oral steroid use, and a history of smoking may easily cross the 3% hip fracture threshold. In that scenario, FRAX shows that the person carries a high level of absolute risk despite having only mild bone thinning on their scan.

What FRAX Does Not Capture

The standard FRAX calculation leaves out several major determinants of bone breakage, most notably your personal history and frequency of falling. The questionnaire does not ask whether you experience dizziness, struggle with balance, have muscle weakness, or take medications that impair alertness.

The tool also simplifies complex clinical scenarios into rigid yes-or-no categories. It does not account for the dosage or total duration of oral steroid treatments, treating someone on a brief moderate dose identically to someone on high daily doses for multiple years. Similarly, it records whether you have broken a bone in the past, but it does not differentiate between someone with one old fracture and someone with several recent fractures.

Additionally, the calculator only incorporates bone density measurements taken at the femoral neck. If your spine shows severe mineral loss while your hip shows relatively preserved density, the resulting calculation may underestimate your true likelihood of sustaining a spinal compression fracture. Because the algorithm treats each variable as present or absent, it can understate risk in people with multiple severe health challenges. Clinicians view the calculation as a helpful starting point for a conversation rather than a definitive diagnosis.

What to Do After You Get Your Number

Interpreting your calculated fracture probability is the starting point for a targeted bone health plan developed alongside your healthcare provider. Rather than viewing the percentage as an unchangeable fate, you can use the result to select effective preventive interventions.

If your ten-year score reaches or exceeds the 3% hip fracture threshold or the 20% major fracture threshold, discuss prescription options with a physician. You can find guidance on clinical discussions through the medical consultation directory. Medical providers frequently evaluate osteoporosis medications that reduce bone breakdown or stimulate new bone formation to stabilize the skeletal matrix.

Regardless of whether your score warrants medication, lifestyle interventions provide the mechanical and nutritional building blocks necessary to maintain bone strength. You can support bone mineral retention by consuming calcium-rich foods such as dark leafy greens, dairy products, and fortified items, ensuring adequate daily intake alongside vitamin D. In addition, engaging in regular weight-bearing exercise and resistance training applies physical stress to bones, signaling osteoblasts to preserve density while strengthening the muscles that prevent falls.

Schedule an appointment with your physician to evaluate your scan results alongside your FRAX calculator score so you can select the right balance of medication, nutritional changes, and strength training.