Lumens per foot calculator

This calculator helps you determine the lumens per foot from total lumens and length, useful for lighting design and planning.

Input Parameters

Calculation Results

Calculation Formula

Lumens per foot = Total Lumens / Length (feet)

Where:
Total Lumens: The total light output of the light source
Length (feet): The length of the area being illuminated in feet

Results

Lumens per foot:

0.00

Square Footage:

0.00

Estimated Lighting Level (lux)

Note: This is an estimate based on an average mounting height of 7 feet.

0 lux 100 lux 1000 lux

Lumens per foot calculator Calculator Usage Guide

Learn how to use the Lumens per foot calculator and its working principles for effective lighting planning

How to use the calculator

  1. Enter the total lumens output from your light source in the "Total Lumens" field.
  2. Enter the length of the area you want to illuminate (in feet) in the "Length (feet)" field.
  3. Click the "Calculate" button to compute the lumens per foot and related metrics.
  4. Review the results, including lumens per foot and estimated square footage.
  5. Use the lux slider to see an estimated lighting level based on typical mounting heights.

When to use this calculator

This calculator is particularly useful for:

  • Planning lighting for residential spaces like living rooms, bedrooms, or hallways.
  • Designing lighting for commercial spaces such as offices, retail areas, or warehouses.
  • Ensuring adequate lighting levels for task areas or specific activities.
  • Comparing different lighting options to achieve desired illumination levels.

Important considerations

The lumens per foot value indicates how evenly the light is distributed along a linear path. For rectangular areas, you may need to calculate separately for length and width, or use a different calculator that accounts for area rather than linear length.

The estimated lux value provides an approximation of the lighting level at a typical eye level (around 7 feet for ceiling-mounted fixtures). Actual lux levels may vary based on fixture type, mounting height, room reflectance, and other factors.