Luminous Intensity Converter — Candela & Candlepower

Convert luminous intensity between candela, millicandela, kilocandela, and candlepower.

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How this conversion works. Intensity is converted through the candela, the SI base photometric unit; historical candle factors follow NIST Special Publication 811.

How to use

  1. Choose the units to convert from and to.
  2. Enter a value — the converted result updates instantly.
  3. Click Copy to copy the result to your clipboard.

Frequently asked questions

How do I convert millicandela to candela?

1 millicandela = 0.001 candela. Choose "Millicandela (mcd)" as From and "Candela (cd)" as To, type a value, and the result updates instantly.

What does an LED’s 5000 mcd rating mean?

5,000 mcd = 5 cd of intensity along its beam axis. Narrow-angle LEDs score high mcd with little total light — compare lumens for real output.

Is candlepower still a real unit?

Modern "candlepower" equals the candela exactly. Historical variants differ slightly: the international candle was 1.019 cd, the German Hefner candle 0.903 cd.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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