Luminous Flux Converter — Lumens

Convert luminous flux between lumens, kilolumens, millilumens, and candela-steradians.

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How this conversion works. Flux is converted through the lumen (cd·sr), the SI photometric unit defined in the BIPM SI Brochure.

How to use

  1. Pick the unit you are converting from, such as Kilolumen (klm) or Lumen (lm).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Candela-steradian (cd·sr) included.

Frequently asked questions

How do I convert kilolumen to lumen?

1 kilolumen = 1000 lumen. Choose "Kilolumen (klm)" as From and "Lumen (lm)" as To, type a value, and the result updates instantly.

How do lumens relate to candelas?

Lumens measure total light output; candelas measure intensity in one direction. A source of 1 cd radiating uniformly over a full sphere emits 4π ≈ 12.57 lm.

How many lumens do common lights produce?

A 60 W-equivalent LED bulb: ~800 lm. A bright flashlight: 1,000–3,000 lm. Stadium floodlights: 100+ klm. Phone torch: ~50 lm.

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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