Convert candle (international) to lumen per steradian instantly. Type in either field — results update live.
Selected cd values converted to lm/sr using the exact factor from this tool.
| cd | lm/sr |
|---|---|
| 0.01 | 0.01 |
| 0.1 | 0.1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 5 | 5 |
| 10 | 10 |
| 20 | 20 |
| 50 | 50 |
| 100 | 100 |
| 1,000 | 1,000 |
Exact conversion factors in both directions, plus a worked example.
1 cd = 1 lm/sr
1 lm/sr = 1 cd
To convert candle (international) to lumen per steradian, multiply by 1.
To convert lumen per steradian to candle (international), multiply by 1.
Example: convert 10 cd to lm/sr
10 × 1 = 10 lm/sr
Short background on the units used in this conversion.
The candle (international) is the historical name for the candela — the SI base unit of luminous intensity. One international candle equals one candela.
International candle remains the reference in photometry texts; modern SI usage prefers candela and lumen per steradian.
Lumen per steradian (lm/sr) equals one candela — luminous flux per unit solid angle in a given direction.
Lumen per steradian expresses directional lamp output and is numerically identical to the candela.
lm/sr = cd × 1cd = lm/sr × 1, using the same exact factors as this converter.