How to Add Dimensions in SOLIDWORKS Drawings

Dimensions in SOLIDWORKS drawings communicate the size, position, and design intent of a part or assembly. You can insert dimensions that already exist in the model, or you can add driven drawing dimensions directly on the drawing sheet. Both methods are useful, but they serve slightly different purposes.

Use Smart Dimension

The fastest way to add a manual drawing dimension is with Smart Dimension. This tool works on edges, vertices, circles, arcs, centerlines, and other visible drawing geometry.

1. Open the drawing and activate the correct sheet.
2. Click Smart Dimension from the Annotation tab or the CommandManager.
3. Select an edge, line, circle, arc, point, or two drawing entities.
4. Move the dimension to a readable location.
5. Click to place it.
6. Review the value, arrow direction, and spacing before adding the next dimension.

Insert model dimensions

If the part or assembly already has useful driving dimensions, use Insert Model Items to bring them into the drawing. This can save time because the dimensions come from the model instead of being recreated on the drawing. It is especially helpful for simple parts where the sketch and feature dimensions already describe the manufactured shape clearly.

After inserting model dimensions, review the sheet carefully. SOLIDWORKS may place dimensions too close together, on the wrong view, or in a way that makes the drawing crowded. Move, hide, or delete dimensions as needed so the drawing remains clear.

Smart dimensions vs model items

Smart Dimension creates driven drawing dimensions. They document the model but do not change the model size from the drawing. Model Items inserts dimensions that were created while modeling. These dimensions are tied closely to the model and can be useful when the same design intent should appear in the drawing.

For many drawings, the best result is a mix of both. Insert the important model dimensions first, then use Smart Dimension to add missing reference dimensions or dimensions that are easier to place directly in the drawing view.

Add the right type of dimension

The type of geometry you select affects the dimension SOLIDWORKS creates. Selecting a line can create a length. Selecting two parallel edges can create a distance. Selecting a circle can create a diameter. Selecting an arc can create a radius. If the dimension is not what you expected, cancel it and select different entities.

For holes and circular features, consider using Hole Callout when the hole was created with Hole Wizard. A hole callout can include size, depth, thread, and quantity information more clearly than a simple diameter dimension.

Keep the drawing readable

Good dimensions are not only correct; they are easy to read. Place dimensions outside the view when possible, avoid crossing extension lines, and keep related dimensions grouped logically. Do not repeat the same dimension in several views unless it genuinely helps manufacturing or inspection.

Fix common dimension problems

If a dimension turns dangling after a model change, it usually means the referenced edge or feature changed. Reattach the dimension to valid geometry or delete and recreate it. If the dimension appears in the wrong units, check the drawing document units. If arrows, text, or precision look wrong, adjust the dimension properties or the drawing standard.

Before releasing the drawing, compare the dimensions against the model and manufacturing requirements. Make sure critical features are defined, duplicate dimensions are removed, and the drawing has enough information for the intended use.