Osteoporosis Risk (FRAX) Calculator

Work out osteoporosis risk (frax) instantly with clear inputs, formula shown and shareable results.

About Osteoporosis Risk (FRAX) Calculator

Compares FRAX ten-year fracture probabilities with the published US intervention thresholds of 20 percent for major osteoporotic fracture and 3 percent for hip fracture.

Formula

Intervention thresholds

Treatment is generally considered when the 10-year major osteoporotic fracture probability is 20% or more, or hip fracture probability is 3% or more

Worked example

With the default values below, Osteoporosis Risk (FRAX) Calculator returns Treatment threshold result of Meets a US treatment threshold — pharmacological treatment usually considered. Change any input above and every figure here is recalculated in your browser.

Inputs used

10-year major osteoporotic fracture probabilityaccepts 0.5–90 %: 18 %
10-year hip fracture probabilityaccepts 0.1–50 %: 3.5 %

Results

Treatment threshold result: Meets a US treatment threshold — pharmacological treatment usually considered
Major fracture criterion: Below the 20% major fracture threshold
Hip fracture criterion: At or above the 3% hip fracture threshold
Higher of the two probabilities: 18.0%

Step by step

1Values used
2Intervention thresholds
3Treatment threshold result= Meets a US treatment threshold — pharmacological treatment usually considered
4Major fracture criterion= Below the 20% major fracture threshold
5Hip fracture criterion= At or above the 3% hip fracture threshold
6Higher of the two probabilities= 18.0

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why not compute FRAX here?

FRAX uses country-specific fitted models that are not published as an open equation, so its output is entered instead.

Do other countries use these thresholds?

No. The UK NOGG approach uses an age-dependent threshold rather than fixed percentages.