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Lighting Calculators

Lighting Power Density Calculator

Lighting power density in W/m² and how it compares to typical energy-code limits.

Enter values

Results update as you type.

Result

Lighting power density

6 W/m²

Typical limit for this space
8 W/m²
Compliance
Within the typical limit
Annual energy
750 kWh
Annual cost
$187.50
Allowable total wattage
400 W

About the Lighting Power Density Calculator

Lighting power density in W/m² and how it compares to typical energy-code limits.

Also known as: lpd calculator, watts per square meter lighting, lighting energy density, lighting compliance.

How to use this calculator

  1. Enter total lighting power, floor area, space type, hours per year and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

LPD = total lighting watts ÷ floor area

Worked example

Using the values pre-filled in the calculator above:

  • Total lighting power = 300 W
  • Floor area = 50 m²
  • Space type: Office (8 W/m² limit)
  • Hours per year = 2,500
  • Electricity rate per kWh = 0.25

the calculator returns:

  • Lighting power density: 6 W/m²
  • Typical limit for this space: 8 W/m²
  • Compliance: Within the typical limit
  • Annual energy: 750 kWh