Steradian (sr)

The steradian (sr) is the SI unit of solid angle—the 3D analog of the radian. One steradian is the solid angle subtended by a spherical cap with area r² on a sphere of radius r. A complete sphere subtends 4π ≈ 12.566 steradians. Used in radiometry, photometry, and antenna theory.

Convert From Steradians

Steradian to Millisteradian Steradian to Microsteradian Steradian to Nanosteradian Steradian to Square Degree Steradian to Square Arcminute Steradian to Square Arcsecond Steradian to Spat Steradian to Hemisphere Steradian to Octant Steradian to Spherical Quadrant Steradian to % Sphere

Convert To Steradians

Millisteradian to Steradian Microsteradian to Steradian Nanosteradian to Steradian Square Degree to Steradian Square Arcminute to Steradian Square Arcsecond to Steradian Spat to Steradian Hemisphere to Steradian Octant to Steradian Spherical Quadrant to Steradian % Sphere to Steradian

Conversion Factors

1 sr 1000 msr

1 sr 1000000 μsr

1 sr 1000000000 nsr

1 sr 3282.8065632 deg²

1 sr 11818109.835 arcmin²

1 sr 42545225575 arcsec²

1 sr 0.0795774715 sp

1 sr 0.1591549431 hemisphere

1 sr 0.6366197724 octant

1 sr 0.3183098861 quadrant

1 sr 7.9577475436 %sphere

Related Units

Millisteradian (msr) Microsteradian (μsr) Nanosteradian (nsr) Square Degree (deg²) Square Arcminute (arcmin²) Square Arcsecond (arcsec²) Spat (sp) Hemisphere (hemisphere) Octant (octant) Spherical Quadrant (quadrant) Percent of Sphere (%sphere)