Convert Steradian to Millisteradian
Convert steradians to millisteradians by entering a value below.
How to Convert Steradians to Millisteradians
The steradian and millisteradian are both units of solid angle. By definition, 1 steradian equals exactly 1000 millisteradians. This means to convert steradians to millisteradians, you multiply by 1000.
Formula
Step-by-Step Example
Convert 5 sr to millisteradians:
We need to convert steradians to millisteradians
Since 1 sr = 1000 msr, multiply by 1000
5 × 1000 = 5000
5 sr = 5000 msr
Steradian to Millisteradian Conversion Table
Quick reference table for common steradian to millisteradian conversions. Click any value for detailed calculation.
| Steradians (sr) | Millisteradians (msr) |
|---|---|
| 0.1 sr | 100 msr |
| 0.5 sr | 500 msr |
| 1 sr | 1000 msr |
| 2 sr | 2000 msr |
| 5 sr | 5000 msr |
| 10 sr | 10000 msr |
| 25 sr | 25000 msr |
| 50 sr | 50000 msr |
| 100 sr | 100000 msr |
About These Units
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.
Millisteradian (msr)
A millisteradian (msr) equals 0.001 steradians or about 3.28 square degrees. Used in radiometry, photometry, and light source specifications. LED beam angle calculations, radiation detector acceptance angles, and luminous intensity measurements use millisteradians.
Frequently Asked Questions
How do I convert steradians to millisteradians?
To convert steradians to millisteradians, multiply the value by 1000. For example, 10 sr = 10000 msr.
How many millisteradians are in 1 steradian?
1 steradian equals 1000 millisteradians.
What is the formula for steradians to millisteradians?
The formula is: msr = sr × 1000.