How do I calculate LED strip power supply size?

Multiply length (meters) by watts per meter, apply duty cycle, add ~20% headroom. Divide watts by voltage for amps.

What size power supply for WS2812B?

Budget ~0.3 W per LED full white (~18 W/m at 60/m on 5V), plus margin and injection on long runs.

Does a bigger supply hurt strips?

Higher wattage at the correct voltage is fine. Wrong voltage is the danger.

Tools / LED Strip Power Supply Calculator

LED Strip Power Supply Calculator

Free LED strip power supply calculator: watts, amps, and PSU size for WS2812B, WLED, 12V RGB strips. Includes safety margin.

Strip preset Length Unit Watts per meter Voltage (V) Brightness / duty (%) Safety margin (%)

Estimated draw—

Current—

PSU with margin—

Buy at least—

How this LED power supply calculator works

Load (watts) = strip length in meters × watts per meter × duty cycle. Current (amps) = watts ÷ voltage. Recommended supply = load × (1 + safety margin).

Size addressable 5V for full white if you ever use it.
Long runs need power injection.
Match voltage exactly.

LED Strip Power Supply Calculator

How this LED power supply calculator works

Control the lights after you wire them