Rounds and fillets the edges of objects.

Access Methods

 Ribbon:  Home tabModify panelFillet.Not available on the ribbon in the current workspace.
 Toolbar: Modify 
 Menu: Modify  FilletNot available in menus in the current workspace
 Command entry: fillet


In the example, an arc is created that is tangent to both of the selected lines. The lines are trimmed to the ends of the arc. To create a sharp corner instead, enter a radius of zero.

You can fillet arcs, circles, elipses, elliptical arcs, lines, polylines, rays, splines, and xlines.

You can also fillet 3D solids and surfaces. If you select a mesh object for filleting, you can choose to convert the mesh to a solid or surface and continue the operation.

List of Prompts

Current settings: Mode = current, Radius = current

Select first object or [ Undo/ Polyline/ Radius/ Trim/ Multiple]: Use an object selection method or enter an option

First Object

Selects the first of two objects required to define a 2D fillet or selects the edge of a 3D solid to round or fillet the edge.

Select second object or shift-select to apply corner: Use an object selection method or hold down Shift and select an object to create a sharp corner

If you select lines, arcs, or polylines, their lengths adjust to accommodate the fillet arc. You can hold down Shift while selecting the objects to override the current fillet radius with a value of 0.

If the selected objects are straight line segments of a 2D polyline, they can be adjacent or separated by one other segment. If they are separated by another polyline segment, FILLET deletes the segment that separates them and replaces it with the fillet.

More than one fillet can exist between arcs and circles. Select the objects close to where you want the endpoints of the fillet.

FILLET does not trim circles; the fillet arc meets the circle smoothly.

If you select a 3D solid, you can select multiple edges, but you must select the edges individually.

Enter fillet radius <current>: Specify a distance or press Enter

Select an edge or [Chain/Radius]: Select edge(s), enter c, or enter r


Selects a single edge. You can continue to select single edges until you press Enter.

If you select three or more edges that converge at a vertex to form the corner of a box, FILLET computes a vertex blend that is part of a sphere if the three incident fillets have the same radii.


Changes from selection of single edges to selection of sequential tangent edges, called a chain selection.

Select edge chain or <Edge/Radius>: Select an edge chain, enter e, or enter r

Edge Chain

Selects a tangential sequence of edges when you select a single edge. For example, if you select an edge on the top of a 3D solid box, FILLET also selects the other tangential edges on the top.


Switches to a single-edge selection mode.


Defines the radius of the rounded edge.


Defines the radius of the rounded edge.

Enter fillet radius <current>: Specify a distance or press Enter

The previous prompt is displayed:

Select an edge or [Chain/Radius]: Select one or more edges, or enter c or r


Reverses the previous action in the command.


Inserts fillet arcs at each vertex of a 2D polyline where two line segments meet.

Select 2D polyline:

If one arc segment separates two line segments that converge as they approach the arc segment, FILLET removes the arc segment and replaces it with a fillet arc.


Defines the radius of the fillet arc.

Specify fillet radius <current>: Specify a distance or press Enter

The value you enter becomes the current radius for subsequent FILLET commands. Changing this value does not affect existing fillet arcs.


Controls whether FILLET trims the selected edges to the fillet arc endpoints.

Enter Trim mode option [Trim/No trim] <current>: Enter an option or press Enter


Trims the selected edges to the fillet arc endpoints.

No Trim

Does not trim the selected edges.


Rounds the edges of more than one set of objects. FILLET displays the main prompt and the Select Second Object prompt repeatedly until you press Enter to end the command.