Range Notebook Target Analyzer
Upload a target photo, mark scale and shots directly on the image, then get group size, zero correction, and a saved local range note.
This is the fast version of a range notebook: upload a target photo, set one known distance, click the bullet holes, and get the answer you came for.
The analyzer measures group size, mean radius, MOA/MIL, point-of-aim offset, and click correction from marks you place directly on the image. Save the note locally or export a clean result card when you want to keep it with your load work.
Turn a target photo into an answer.
Upload a clear target, set one known distance, click the holes, and get group size plus zero correction. Photos and notes stay in this browser.
Target workspace
Upload a photo to begin. The active step will change as you mark the target.
See the group, not a spreadsheet.
Start with a target photo. You will mark scale, aim point, and shot holes directly on the image, then get the result card on the right.
Fine tune marks
| Point | X px | Y px | Type | Move |
|---|---|---|---|---|
| No points marked yet. | ||||
Local notebook
Saved sessions live in this browser. Export JSON if you want a backup.
JavaScript is required because the tool measures a local photo in your browser. Measurements are photo-calibrated estimates; confirm zero with another group.
What The Target Analyzer Measures
Use the Target Analyzer after a range trip when the paper tells a story and you want the numbers without rebuilding the session in a spreadsheet. Upload a clear target photo, mark a known distance for scale, then click the impacts directly on the image. The tool turns those marks into group size, mean radius, angular size, point-of-aim offset, and scope correction.
The result is meant to sit beside a range notebook: rifle, load, distance, target, weather, and the correction you actually tried next. It is especially useful when you are comparing practice groups, checking whether a zero shift is real, or trying to keep load-development notes attached to the target that produced them.
When To Use It
Use it for photo-calibrated group measurement, zero confirmation, and session records. It is not a replacement for careful shooting fundamentals, a square target photo, or a second confirmation group after you move the scope. The tool gives you a clean estimate; the next target tells you whether the rifle agreed.
Quick FAQ
Does the Target Analyzer upload my target photo?
No. Target photos, saved range notes, and exports stay in your browser unless you manually share an exported file.
What should I use for scale?
Use the longest known distance you can mark clearly, such as a one-inch grid span or a measured target ring. Longer calibration spans reduce small click errors.
Is the correction a final zero?
No. Treat the correction as a range-note estimate, make the adjustment, and confirm with another group on paper.
Can I save range sessions?
Yes. The notebook saves sessions locally in the browser so you can reopen, duplicate, export, or delete them from the same device.
Cite This Tool
Suggested citation: Holdover, "Range Notebook Target Analyzer", last updated May 19, 2026, https://www.holdover.ca/target-analyzer/.
Measurement Note
This tool measures a photo, not the physical target. Camera angle, paper curl, scale length, and click placement can all move the result. Calibrate across the largest known distance you can, square the target to the camera, and treat the output as a range-note estimate.
Privacy Note
Photos and saved sessions stay in the browser through local storage. Nothing is uploaded to Holdover unless you manually share or publish an exported file.
Related Holdover Tools
If this is the job on your bench, these nearby tools are usually part of the same workflow.