Enter the diameter of a circle. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle, or any two points on the circle as long as they are exactly 180 degrees apart.

Uv lamp curingmachine

This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area.

Uv lamp curingkit

Click save settings to reload page with unique web page address for bookmarking and sharing the current tool settings, or click flip tool to reverse the tool function with current settings

Switch tool with the current settings for diameter, and calculate circle circumference, circle radius, sphere volume or sphere surface area instead