by Patrick-Tiefenbacher·Modeling
Images © Patrick-Tiefenbacher. Used for product review; image policy.
Exact Radius earns its place in the blender_extensions library for a focused job: turning vertex selections into circles of a set radius from a shortcut, with arcs, multiple rings and multi-object editing covered.
In Edit Mode, select one or more rings of vertices — a full circle, a hole, or a partial arc — press Alt+R (configurable) or open the Vertex menu, type the radius, and press Enter. The entry accepts math expressions, so 20/2 turns a diameter into its radius. Pressing Enter with nothing typed uses the fitted radius, and Esc cancels. The operation is non-destructive and undo-able, with no scaling or applying involved.
It works on one ring or many at once — separate holes or rings stacked in a single mesh, such as the cross-sections of a tube — fitting and resizing each independently. Multi-object edit mode is supported across several meshes. Any orientation works, since it fits the selection's own plane, and partial arcs get the correct center through a least-squares fit. The selection is validated, so a face, whole mesh or blob returns a clear error. After running, the F9 redo panel sets the center to Auto or the 3D Cursor.
Compatible with Blender 4.2 LTS and newer, released under GPL-3.0-or-later.
Exact Radius is best for blender modelers who need vertex rings set to a precise radius straight from the keyboard, without scaling or applying transforms.
Exact Radius is completely free to download and use.
Exact Radius is compatible with Blender 4.2 LTS and newer. In Blender 4.2 and up you can add it through Preferences → Get Extensions, or use Install from Disk with the built .zip. The version listed here is 1.9.4, updated June 23rd, 2026, and published the same day. Since it targets 4.2 as the minimum, older releases fall outside its stated compatibility range. For the latest build and any changes since, check the developer's GitHub page.
Exact Radius runs in Edit Mode: select one or more rings of vertices — a full circle, a hole, or a partial arc — then press Alt+R (configurable) or choose Vertex menu → Exact Radius. Type the radius and press Enter, just as you would for Move or Scale. The field also accepts math, so entering 20/2 converts a diameter into its radius. Pressing Enter with nothing typed uses the fitted radius, and Esc cancels the operation.
Exact Radius works on one ring or many in a single call, including separate holes or rings stacked in one mesh, such as the cross-sections of a tube, with each fitted and resized independently. It also supports multi-object edit mode across several meshes. Partial arcs are handled too — a quarter circle gets the correct center and radius through a least-squares fit. Any orientation works because it fits the selection's own plane, so tilted or rotated rings still become perfectly round.
Exact Radius is listed as free in this catalog, and it's released under the GNU General Public License v3.0 or later (GPL-3.0-or-later). The extension notes it requires no special permissions. For the most current licensing terms, download options and source code, visit the developer's GitHub page at github.com/Matrex96/blender-exact-radius, which also hosts the issue tracker for reporting problems. Because it's an open-source project under the GPL, the source is available there as well.
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