Watts per Square Foot Calculator

What this calculator estimates

Compare installed lighting power with the area of the active canopy.

How the calculation works

Divide total fixture draw in watts by canopy length multiplied by canopy width. This is a power-density measurement, not a direct PPFD measurement.

How to use the result

Enter values that represent the current setup, review the calculated result, and compare it with direct measurements and equipment documentation before making changes.

Important limitations

Actual photon delivery also depends on fixture efficacy, mounting height, dimming, reflectivity, overlap and canopy uniformity.

This tool is intended for planning and comparison. Recheck inputs whenever equipment, layout, crop size or operating conditions change.