Enter the total number of lumens and the total area of a room into the calculator to determine the lumens per square foot.

## Lumens Per Square Foot Formula

LPSF = TL / (L*W)

- Where LPSF is the lumens per square foot
- TL is the total number of lumens
- L is the length of the room
- W is the width of the room

## Lumens Definition

A lumen is a unit of measure that describes a luminous flux or in other words the light emitted per second.

## Lumens Per Square Foot Example

How to calculate lumens per square foot?

**First, determine the total number of lumens.**Calculate the total number of lumens produced by the light sources of the room.

**Next, determine the width.**Measure the width of the room in feet.

**Next, determine the length.**Measure the length of the room in feet.

**Finally, calculate the lumens per square foot.**Calculate the LPSF using the equation above.

## FAQ

**What is a lumen?**

A lumen is a unit of measure of the amount of luminous flux.