Step 1: How to use this calculator?

Calculate lumens needed: 25m2 x 500 lux = 12,500 lm

Step 2: How to use this calculator?

Calculate fixtures: 12,500 lm / 3200 lm/fixture = 3.9 = 4 fixtures

Not accounting for light loss from dirty fixtures over time

Using incorrect maintenance factor for the environment

LED Lighting Lumen Calculator

Last updated: 2026-08-24

LED Lighting Lumen Calculator — LED Lighting Lumen Calculator. Free online calculator with formula, examples and step-by-step guide.

Inputs

Result

Enter values and press Calculate

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How to use it

Calculate lumens needed: 25m2 x 500 lux = 12,500 lm
Calculate fixtures: 12,500 lm / 3200 lm/fixture = 3.9 = 4 fixtures
Adjust for ceiling height and wall colors
Distribute fixtures for uniform lighting

Common mistakes

⚠️ Not accounting for light loss from dirty fixtures over time
⚠️ Using incorrect maintenance factor for the environment
⚠️ Ignoring glare and uniformity requirements in workspace

Worked example

Calculate light fixtures needed for 25m2 office requiring 500 lux.

To {area_m2}m² with {lux_requeridos} lux need {lumenes_totales} lumens. Con lámparas of {eficiencia_luminaria} lm/W: {power_total_w}W in {luminarias_ud} light fixtures of {w_por_luminaria}W.

Input guide

Field	Typical range
area_m2	area of the local a iluminar
eficiencia_luminaria	LED: 80-150 lm/W, Fluorescente: 60-100 lm/W
lux_requeridos	Oficina: 300-500 lux, Hogar: 100-300 lux, Taller: 500-1000 lux