Circle Area to Diameter Calculator

Calculate Diameter of Circle
Circle Area [?]
Select area unit sq nanometres (nm²) sq micrometres (µm²) sq thous (thou²) sq millimetres (mm²) sq centimetres (cm²) sq inches (in²) sq feet (ft²) sq yards (yd²) sq metres (m²) acres (ac) hectares (ha) sq kilometres (km²) sq miles (mi²) sq nautical miles (nmi²)
Diameter (ø) [?]
Select diameter unit nanometres (nm) micrometres (µm) thousands of an inch (thou) millimetres (mm) centimetres (cm) inches (in) feet (ft) yards (yd) metres (m) kilometres (km) miles (mi) nautical miles (nmi)

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User Guide

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

Formula

The formula used to calculate the circle diameter is:

ø = 2 x √(A / π)

Symbols

• ø = Circle diameter
• A = Circle area
• π = Pi = 3.14159…

Area of Circle

Enter the area contained within a circle.

Diameter of Circle

This is the diameter of a circle that corresponds to the specified area.