LED Power Supply Sizer (max 300 W per PSU) Calculates with a 20% safety margin (each PSU used at 80% of nameplate). If load exceeds 300 W per PSU, the tool recommends multiple PSUs. Mode Single-color RGB (3 channels) Watts per foot Length per strip (ft) Number of strips Calculate Reset Assumptions & tips For RGB, enter watts/ft per color channel. The tool sizes drivers per channel and multiplies PSU counts by 3. Per-PSU cap is fixed at 300 W. Headroom is fixed at 20% (usable = 80% of nameplate). Do not parallel DC outputs. Use a shared dimming/control bus if needed. This calculator requires JavaScript.