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##### Group Size Calculator

Annotate a target photo to measure group size, mean radius, and correction.

###### Display units

###### Setup

Distance (m)
Required for MOA values
Reference length (mm) *
Real-world length of the line you'll draw
Bullet ⌀ (mm)
Draws bullet holes at correct scale

###### Annotation

###### Legend

Reference line
POA — Point of Aim
POI — Bullet holes
Group centroid

Drop your target photo here

or click to browse — JPEG, PNG, WebP

###### Results

Draw a reference line on the image.

Shots (POIs) | —
Group size (ES) | —
Mean radius | —
Group offset from POA | —
Correction needed | —

Enter the distance above to see MOA values.