Purpose: To determine the linear footage (arc length) for a specific curved application. 

For example, the calculator below can help you answer these questions "How many linear feet of top track do I need for this curved wall?" or "How long does the track have to be to create the top of the arched window?"


Instructions: Enter any two of the three measurements listed in the Input Known Values table. Your output will appear in one of the three tables below depending on which two measurements were entered. Your output will be the third measurement along with the Arc Length.

Measurement Tips

Determining the Outside Radius of a Curved Wall: Be sure your measurements are to the outside edge of the top or bottom track on a curved wall application (be sure you've subtracted all finished wall offsets when looking at your plans). 

Determining the Cord Height on a Curved Door or Window: For an arched door or window measure to the web portion of the product whether the flanges point up or down: When flanges are pointing down, you'll be including the flange length in the cord height measurement. When the flanges are pointing up to receive studs, the flange length will not be included in the cord height measurement.

Don't Forget To Print!

Your output can be printed and taken with you to the jobsite.

Input Known Values

  Feet Inches Wall Adjustment Total (inches)
Arc Radius (r)
Chord Height (CH)
Chord Length (CL)

Computed Radius and Arc Length

(Chord Length and Chord Height are Known)

  Feet Inches Total (inches)
Arc Radius (r)
Arc Length (L)

Computed Chord Height and Arc Length

(Radius and Chord Length are Known)

  Feet Inches Total (inches)
Chord Height (CH)
Arc Length (L)

Computed Chord Length and Arc Length

(Radius and Chord Height are Known)

  Feet Inches Total (inches)
Chord Length (CL)
Arc Length (L)

Curved-Right

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