Calculators - Estimators - Template Generators
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If you're laying out a large radius arc in a confined area and can't reach the center of the circle, enter arc dimensions below to find lay-out points in the curve. Also see Printable Arc Templates to create printable paper templates for smaller arcs.

 Arc Width Height Radius Increments Offset Color Feet Inches

Left click, release and drag to
measure at scale in diagram.
Height

Sweep Angle °

Arc Area   ft²

Length around Arc

Full Circle Circumference

Full Circle Area   ft²
 Scale Height Increments

Inside Arc (right side bottom of diagram)
Mark-out

Outside Arc (left side top of diagram)
Mark-out

To lay out a large radius arc in a confined area, enter either the maximum height of the arc (above centre of chord), or the radius of the arc, and the increments along the chord line for your lay out points.

The smaller the increments, the more accurate (and smooth) the arc line will be.

Mark the base 'chord' line and increments from centre outwards, and measure 90 ° to the arc points to form the arc.

To make sure the measured points are square off the base line, mark another line parallel to the base line (above or below), square a line through the center, mark corresponding increments and line through both increment marks to mark the arc points.

Calculate Arc Height and Width From Radius and Sweep Angle

 Radius Sweep Angle °
If you know the Radius of your arc, and the Sweep Angle, and need to find the Height and Width to draw the template, enter Radius and Sweep Angle and hit Calculate Height to calculate the height and width of the arc. Enter the Height and Width (Chord) above to draw the arc template.

 Sweep Angle Radius Scale

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Metric or Imperial
The main (larger) navigation menu tabs are for the Metric versions of calculators.
If there is an Imperial (Feet and Inches) version, under the main Metric tab will be a smaller Imperial tab.

Create PDF files to print diagrams on current page. Printing to Scale Help and Plan Printing.

To fine tune Slider Controls click to select and use (cursor) keyboard keys.

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Lay your device on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

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ALWAYS CHECK WITH YOUR LOCAL BUILDING AUTHORITY BEFORE LAYING OUT OR BUILDING ANYTHING
AND FOLLOW ALL LOCAL CODES. VERIFY ALL DIMENSIONS AND ANGLES BEFORE CONSTRUCTION.
All calculators on this site are GEOMETRIC only. Check local regulations for sizes, spacings and all engineering requirements.

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