Millicandela to Lumens Calculator
Enter millicandela and the beam solid angle in steradians. The calculator converts mcd to cd, then applies lm = cd × sr.
Estimated lumens:
A QUICK WALKTHROUGH
How to use this tool
- Enter the luminous intensity in millicandela (mcd).
- Enter the beam solid angle in steradians (sr).
- Calculate the estimated luminous flux in lumens (lm).
A beam angle is required
Millicandela measures luminous intensity in a direction, while lumens measure total luminous flux. There is no single millicandela-to-lumens conversion without the beam solid angle or an equivalent distribution assumption.
Unit conversion
One candela equals 1000 millicandela. The calculator first converts mcd to cd by dividing by 1000.
Formula
For the stated uniform-intensity assumption, luminous flux in lumens = (millicandela ÷ 1000) × solid angle in steradians.
GOOD TO KNOW
Common questions
Can millicandela be converted to lumens directly?
No. Enter a beam solid angle or another valid light-distribution assumption; the tool uses lm = (mcd ÷ 1000) × sr.
What does steradian mean here?
It is the unit of solid angle. A full sphere is 4π sr, while a narrower beam occupies fewer steradians.