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Arc Length Calculator

Calculate the length of a circular arc for deck camber, hull curves, and more.

Quick Samples
Try these common configurations to get started

Deck Camber

A typical 12ft wide deck

Hull Sheer Line

A gentle sheer for a 30ft boat

Coach Roof Curve

A common cabin top curve

Hull Dimensions
Enter your boat's principal dimensions

e.g., inches, mm

degrees

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About This Tool
The Arc Length Calculator is a simple geometry tool essential for boat building and other fabrication projects. It accurately calculates the key dimensions of a circular arc—the true arc length, the straight-line chord length, and the sagitta (or camber)—based on a given radius and angle. This is perfect for laying out deck camber, cabin tops, transom curves, and any other part of a boat defined by a circular curve.

Key Concepts:

Arc Length: The distance along the curve of the arc.
Chord Length: The straight-line distance between the arc's endpoints.
Sagitta (Camber): The height of the arc from the center of the chord.
Radius: The distance from the center of the circle to any point on the arc.
Frequently Asked Questions

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