Skip to content
Aoneko Tools
AONEKO / FREE PRINTABLE TEMPLATES

Free Sector Template Generator

Create a circular sector from radius and angle, arc length or chord length. Add an inner radius for an annular sector.

Loading tool…

Print at Actual size / 100%. Check that the scale measures 100 mm (3.94 in).

Print preview

The screen preview is scaled. PDF keeps the actual dimensions.

Radius, angle, arc and chord

Choose the radius plus central angle, outer arc length or chord length. Arc length is measured along the curve; a chord is the straight line between its endpoints. For the same chord, choose the minor or major sector. Arc length is rθ and chord length is 2r sin(θ/2), with θ in radians.

Annular sectors and cone patterns

A positive inner radius makes a band-shaped annular sector. Keep Show radial edges on for a closed cutout. For cone nets, this radius is the slant height, not the vertical height. This page does not add glue tabs; use the cone generator for assembly tabs.

Frequently asked questions

What is the arc length for a 100 mm radius and 90° angle?

About 157.080 mm. The chord is about 141.421 mm.

What angles are supported?

Central angles from 1° to 359°. Use the circle tool for a complete circle.

Download and print at actual size

  1. Choose inches, cm or mm and enter the size.
  2. Adjust rotation, line style, layout and paper options as needed.
  3. Download PDF and print at Actual size / 100%, with Fit to page and borderless enlargement off.
  4. Measure the 100 mm calibration scale before using the template.

US Letter, US Legal, A4, A3 and JIS B5 are available. Oversized shapes are tiled at actual size. Trim at the printed tile borders and align the overlap. ROW and COL identify the tile position. PDF contains all pages. SVG and PNG save the current preview page; PNG is 150 dpi and print software may resize it, so use PDF for precise printing. Up to 200 shapes and 200 pages.

Dimensions are measured at line centers. Input and file generation stay in your browser, with no account or upload needed. Free for personal and commercial use.