Rectangle to Circle Converter (Equivalent Diameter Calculator)

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This rectangle to circle calculator helps you find the equivalent diameter of a circle with the same area as a given rectangle.

Enter the rectangle length and width, and the calculator will determine the round diameter needed to match that area.

This is useful in machining when converting rectangular dimensions into round stock size, comparing material shapes, or selecting the correct starting bar size.

Formula:

Rectangle area = length × width

Equivalent circle diameter = √(4 × length × width / π)

Example:

If the rectangle is 4 inches by 2 inches, the equivalent circle diameter is approximately 3.19 inches.

When to use this calculator:

Use this calculator when converting rectangular dimensions into an equivalent round diameter.

Machining tip:

This is useful when selecting round bar stock to replace rectangular material while maintaining the same cross-sectional area.

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