Bone Age AI
This bone age AI reads one left-hand radiograph and returns an educational skeletal-age estimate in years and months, plus the total in months. The same free bone age calculator shows chronological age and compares the estimate with the Brush mean and standard deviation from Greulich and Pyle.
The image model is sex-conditioned. Select female or male before the estimate. A pediatric bone age study for this calculator is a single left-hand X-ray. Do not upload identifying information.
The measured error is published on About: a mean absolute error of 6.44 months on 1,425 official RSNA validation images, with the interval, the coverage, and the limits of that measurement.
Bone Age Calculator
Use the bone age calculator above by adding the radiograph, the birthday, the X-ray date, and sex. The result is an estimated bone age, the age at the X-ray, and a Brush mean for that chronological age. You can copy a text report for teaching. The report states that the result is an educational estimate.
This page is a free skeletal-age calculator for one hand radiograph. Clinical performance has not been established. How bone age and chronological age differ is on Bone Age and Chronological Age Calculator.
Greulich and Pyle Bone Age
Greulich and Pyle bone age is an atlas comparison of a hand and wrist radiograph with reference standards of skeletal maturity. Bone Ager shows the Brush Foundation mean and standard deviation published with that method, interpolated between the published ages. The on-screen label is Brush Mean and SD. The model prediction is separate from that mean, and the page also shows whether the estimate sits inside or outside a two-standard-deviation band around the Brush mean. The lookup limits are on Greulich and Pyle Bone Age Calculator.
The atlas comparison is a teaching reference. It does not assign a specific atlas plate, and it does not replace a clinician reading the film.
Left-Hand Bone Age X-Ray
A left-hand bone age X-ray includes the fingers, metacarpals, carpals, and the distal radius and ulna, with the full wrist in the field. PNG and JPEG files up to 12 MB are accepted. The radiograph is processed in memory for the estimate and is not saved on the server. How to capture that film is on Capture a Left-Hand Film.
Same-sex reference films from the training set can be shown after an estimate, including examples labeled younger, nearer, and older than the prediction. Those labels come from the training data. They are educational comparisons.
Windows 10 and Windows 11 include Snipping Tool. Use it to capture the radiograph on your screen and insert it into this bone age calculator. The Windows toolbar steps are on Snipping Tool on Windows.
- Remove Identifying Information. Crop out every name, date of birth, record number, and accession number before you capture the image. Do not upload identifying information.
- Snip the Hand and Wrist. On Windows, press Windows+Shift+S. The screen dims and a toolbar opens at the top. Choose Rectangle, then drag a box around the left hand and the full wrist. Windows copies that snip to the clipboard. On a Mac, press Shift+Command+Control+4 and drag the same box.
- Paste the Image. Click this page and press Ctrl+V on Windows or Command+V on a Mac. The image is inserted into the upload area. You can also save a PNG and use Choose an X-Ray.
If Windows+Shift+S does nothing, open the Start menu, type Snipping Tool, and open the app. Choose Rectangle, select New, and drag the same box. Press Ctrl+C if the snip is not already on the clipboard, then click this page and press Ctrl+V. You can also press Ctrl+S, save a PNG, and use Choose an X-Ray. Do not upload identifying information.