Calculator
Example Data Table
| Age | Sex | BMI | T Score | Risk Factors | Major Estimate | Hip Estimate |
|---|---|---|---|---|---|---|
| 55 | Female | 27.1 | -0.8 | None selected | 3.4% | 0.4% |
| 68 | Male | 22.5 | -1.9 | Smoking, steroid use | 12.8% | 2.5% |
| 78 | Female | 19.3 | -2.7 | Prior fracture, parent hip fracture | 34.6% | 11.8% |
Formula Used
BMI: weight in kilograms divided by height in meters squared.
Clinical load: selected risk factors are converted into weighted points. Prior fracture, parent hip fracture, smoking, glucocorticoids, rheumatoid arthritis, secondary osteoporosis, alcohol, and falls are included.
Bone density adjustment: when a femoral neck T score is entered, lower values increase the educational estimate.
Major estimate: logistic probability from age load, BMI load, sex load, clinical load, T score load, and background rate model.
Hip estimate: a separate logistic probability with stronger age and T score influence. Parent hip fracture adds an extra hip adjustment.
This is a clear educational formula. It is not the official FRAX algorithm.
How to Use This Calculator
Enter age, sex, measured height, and measured weight. Add the femoral neck T score when available. Select each clinical risk factor carefully. Choose a background rate model that matches your local review preference. Enter review markers used by your clinic or project.
Press Calculate. The result appears above the form and below the header. Review the major fracture estimate, hip fracture estimate, BMI, selected factors, and band. Use the export buttons to save a CSV file or simple PDF report.
Do not use this page as a diagnosis. Confirm important results with a qualified clinician.
FRAX Score Article
Purpose
A FRAX score estimate helps organize fracture risk details before a clinical review. It combines age, body size, sex, bone density, and selected medical history. The goal is not to replace judgment. It gives a structured way to compare risk patterns.
Model
This page uses a transparent educational model. Official country models are more complex. They use validated cohorts and calibration tables. This tool keeps the inputs visible. It is useful for learning, screening notes, and preparation for appointments.
Inputs
Age usually has a strong effect. Fracture probability rises as bone strength, balance, and muscle reserve decline. Low body weight can also raise concern because it often reflects less skeletal loading. Femoral neck T score adds another important signal. A lower T score increases the estimated probability.
Risk Details
Clinical risk factors add context. A previous low trauma fracture matters. A parent with hip fracture also matters. Smoking, steroid exposure, rheumatoid arthritis, secondary osteoporosis, and heavy alcohol use can push the estimate higher. Frequent falls are included as an extra planning factor.
Results
The calculator reports major osteoporotic fracture and hip fracture estimates. Major fracture generally covers common osteoporotic fracture sites. Hip fracture is displayed separately because it often carries high disability risk. Both values should be read with the input summary.
Review Markers
Use the threshold boxes as local review markers. Clinics and countries can set different action points. A high marker does not mean automatic treatment. A low marker does not prove safety. It means the result should be discussed with a qualified professional.
Exports
CSV export supports spreadsheet records. The simple PDF export supports printable summaries. Keep exports with the date, patient label, and notes. Do not store private medical data on shared devices.
Accuracy
Better inputs produce better estimates. Use measured height and weight when possible. Use femoral neck data from a reliable scan if available. Recheck entries before sharing the report. Treat this page as an educational calculator, not a diagnosis.
Example Use
Print the example table when explaining the tool to a user. It shows how similar inputs can lead to different risk bands. It also reminds readers that one factor rarely tells the whole story. Final decisions should include symptoms, medicines, scan quality, fracture history, and professional review by a licensed clinician when needed.
FAQs
1. Is this the official FRAX calculator?
No. This is an educational estimator. The official model uses validated country specific algorithms. Use official tools and clinical review for patient decisions.
2. What does the major fracture estimate mean?
It is an estimated probability for common osteoporotic fracture sites. It helps compare risk patterns, but it is not a diagnosis or treatment decision.
3. Why is hip fracture shown separately?
Hip fracture can have serious effects on mobility and independence. A separate hip estimate makes that risk easier to review.
4. Can I leave the T score blank?
Yes. The calculator can estimate from clinical inputs only. Add femoral neck T score when reliable scan data is available.
5. What is the background rate model?
It is an educational calibration choice. Select low, standard, high, or very high to test how local fracture background may change estimates.
6. What are review markers?
Review markers are custom thresholds. They help flag results for discussion. They should match local policy or clinician preference.
7. Are CSV and PDF exports secure?
The exports are simple files created by the page. Store them carefully, especially when they include labels or medical notes.
8. Who should interpret the result?
A qualified healthcare professional should interpret the result. They can consider symptoms, scans, medicines, fall risk, and full medical history.