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CAD tip CAD tip # 10138:

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Q - question

Dimensioning a curve length or distance between two points on a curve.

A - answer With the freeware utility CADstudio DimCurve you can dimension the length of any 2D or 3D curve in AutoCAD - polyline, spline, arc, circle, ellipse, helix...

You can choose whether the resulting length will be annotated with a true linear dimension or with a curved "dimension" copying the shape of the dimensioned object. The annotation text format (prefixed with ">>" by default) can be customized.

Besides the total length you can also dimension the distance (along the curve) of two picked points on the curve (the option betweenPoints). The dimension is created in the layer "Dimensions", or in the layer of the dimensioned curve entity (the option Entlayer).

You can download the DimCurve add-on utility from, load it with APPLOAD and run it by typing the DimCurve command.

Sample video:

The default text formatting function (prefix "»", number of decimal places by DIMDEC) can be redefined by using/defining your own function _DimCurveFormat.
(defun _DimCurveFormat (n)  
 (strcat "\U+00BB " (rtos n (getvar "lunits")(getvar "dimdec")))  

More add-on utilities for AutoCAD, Inventor, Revit and other Autodesk software can be found on

100% *  CAD 
15.12.2014    11549×  
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applies to: AutoCAD ·

See also:
Tip 11989:How to dimension an ellipse in AutoCAD?
Tip 5883:How to measure distance along a curve?
Tip 2021:How to make an associative dimension of polyline length?

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