Calculator · Geometry & layout
Arc Radius Calculator
The free Arc Radius Calculator answers one question: Radius from the chord width and arc height. Enter your numbers in inches or millimeters and the result updates instantly in your browser, with no sign-up and no app to install. Use it on your phone at the bench, then copy or print the result for your cut list.
Perfect for curved aprons, arched tops and headboards: measure the width and how high the curve rises.
Arc Radius
- Radius
- 55.5″
- Trammel / compass setting
- 55.5″
- Arc length
- 36.663″
- Arc angle
- 37.8°
Pro tools · unlock
Which other geometry & layout calculators help with this project?
- Circle Calculator — Circumference and area for round tabletops.
- Diagonal & Squareness Calculator — Check a carcass or frame for square.
- Rafter Length Calculator — Rafter length for a shed or gable roof.
- Polygon Side Length Calculator — Side length for hexagons, octagons and more.
What you'll need for this project
Tools
Screws & hardware
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Build it · Intermediate · 1 day
Download the complete plan with cut list and materials list (PDF)
Arched Mirror Frame — Elegant arched-top mirror frame laid out with a trammel and the arc calculator. Drawings, cut list with board-foot totals, hardware list and step-by-step instructions.