Advanced Osteoporosis Risk Calculator

Calculator form

This educational tool uses a weighted score, not a diagnostic medical rule.

Age

Sex

Weight (kg)

Height (cm)

Previous fragility fracture

Parent had hip fracture

Current smoking

Oral glucocorticoids, 3+ months

Rheumatoid arthritis

Secondary osteoporosis cause

Alcohol 3+ units daily

Menopause status

Falls in last 12 months

Weight-bearing activity

Calcium and vitamin D support

Optional DXA T-score

How to use this calculator

Enter age, sex, weight, and height.
Add fracture history, smoking, steroid use, and family history.
Choose menopause, activity, falls, and nutrition details.
Enter an optional DXA T-score if available.
Press Calculate Risk to show the result above the form.
Review the category, graph, and factor table.
Download CSV or PDF if you want to save the result.
Use the result as a screening conversation starter, not a diagnosis.

Formula used

Custom weighted screening model

Body Mass Index

BMI = Weight (kg) / [Height (m)]²

Weighted raw score

Raw Score = Sum of risk-factor points

Estimated risk percent

Risk % = 100 / (1 + e^{-0.09 × (Raw Score - 35)})

This converts the weighted score into a smoother percentage scale for easier interpretation.

Factor	Point rule
Age	45 to 54 = 6, 55 to 64 = 14, 65 to 74 = 24, 75+ = 32
Sex	Female = 8, Male = 4, Other = 6
BMI	<18.5 = 12, 18.5 to 21.9 = 8, 22 to 24.9 = 4, 25 to 29.9 = 1
Previous fragility fracture	Yes = 18
Parent hip fracture	Yes = 10
Current smoking	Yes = 8
Long-term oral glucocorticoids	Yes = 10
Rheumatoid arthritis	Yes = 8
Secondary osteoporosis causes	Yes = 10
Alcohol 3+ units daily	Yes = 7
Menopause	Postmenopause = 8, Premature menopause = 14
Falls	1 to 2 = 5, 3+ = 9
Activity	Low = 6, Moderate = 2, High = 0
Calcium and vitamin D support	Inconsistent = 3, Poor = 5
Optional T-score	-1.0 to -2.4 = 10, -2.5 or lower = 20

Example data table

Profile	Age	Sex	Weight	Height	Key details	Score	Risk %	Category
Profile A	48	Female	64 kg	163 cm	Premature menopause, moderate activity	34	47.8%	Moderate
Profile B	58	Female	61 kg	165 cm	Postmenopause, inconsistent calcium support	39	58.9%	High
Profile C	67	Female	52 kg	164 cm	Prior fracture, low activity, falls, T-score -1.8	92	99.4%	Very High

Frequently asked questions

1) Does this calculator diagnose osteoporosis?

No. It is an educational screening calculator. It summarizes common risk signals into a weighted result, but diagnosis requires proper medical evaluation and often DXA testing.

2) Who can use this calculator?

Adults can use it for screening context. It may be especially useful when someone wants a structured overview of fracture-related risk inputs before discussing them clinically.

3) Why is the T-score optional?

Many people do not have a DXA result yet. The calculator still works from history and lifestyle inputs, then becomes more informative when a T-score is available.

4) How is BMI used here?

The file calculates BMI from weight and height. Lower BMI adds more points because lower body mass can align with lower bone reserve in screening models.

5) Which answers raise the score most?

Older age, a prior fragility fracture, very low T-score, low BMI, steroid exposure, and repeated falls make the largest increases in this custom model.

6) Can a low result still need medical follow-up?

Yes. A low screening result does not rule out bone loss, especially when symptoms, a recent fracture, or clinician concern already exist.

7) What should I do after a high result?

Use the result as a prompt for a clinician visit. A formal fracture review, medication check, fall review, and bone density discussion may be appropriate.

8) Can I save or share my result?

Yes. The page includes CSV and PDF download buttons after calculation so you can keep a copy of the result summary and graph.

Important note: This page is for education and screening support only. It does not diagnose osteoporosis, predict an exact fracture probability, or replace clinician assessment, DXA interpretation, or an official FRAX workflow.