LED Strip Power Calculator

Choosing the right power supply for an LED strip installation requires accounting for strip length, wattage, wire distance, and a safety buffer — the LED Strip Power Calculator handles all of it in one place. Enter your LED strip length, power consumption per unit, operating voltage (12V or 24V), and wire run length, then select a safety margin to get your recommended power supply wattage. Secondary outputs include total LED power, current draw, and estimated voltage drop across the wire run.

ft

Total length of LED strip to be powered

W

Watts consumed per foot/meter of LED strip

ft

Distance from power supply to LED strip

Additional capacity for safety and longevity

Results

Recommended Power Supply

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Total LED Power

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Current Draw

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Estimated Voltage Drop

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Frequently Asked Questions

How do I calculate the power supply needed for LED strips?

Multiply the LED strip length by its power consumption per unit, then add a safety margin of 20-30%. This ensures your power supply can handle the load without being overworked.

What safety margin should I use for LED strip power supplies?

A 30% safety margin is recommended for most installations. This provides headroom for voltage fluctuations and extends the life of your power supply by preventing it from running at maximum capacity.

Does voltage drop affect LED strip performance?

Yes, voltage drop can cause LED strips to dim or change color, especially over longer runs. Use thicker wire or consider power injection points for runs longer than 16 feet on 12V strips.

Should I choose 12V or 24V LED strips?

24V LED strips have lower current draw and less voltage drop over long distances. Choose 12V for shorter runs (under 16 feet) and 24V for longer installations or when minimizing wire thickness.

Can I connect multiple LED strips to one power supply?

Yes, as long as the total power consumption of all strips doesn't exceed your power supply's capacity. Calculate the combined wattage and ensure you maintain proper safety margins.

What wire gauge should I use for LED strip installations?

Wire gauge depends on current draw and distance. For 12V strips, use 18 AWG for runs under 8 feet, 16 AWG for 8-16 feet, and 14 AWG for longer runs to minimize voltage drop.