LED Strip Voltage Drop Calculator

Current flowing through FPCB copper loses voltage with distance, so the far end of a constant-voltage run dims first. The simulator models copper weight, system voltage and feed topology and reports worst-case brightness at the end of the run.

How the LED Strip Voltage Drop Calculator works

Three levers move the limit: a higher system voltage (less current for the same wattage), thicker copper — DENO builds commonly use 35+70 µm and heavier 30+105 µm double-sided copper — and both-ends or mid-point feeding, which halves the effective distance to L/2.

Higher voltage: 24V and 48V carry the same wattage at lower current.
Thicker copper: 35+70 µm or 30+105 µm double-sided builds.
Feed topology: both-ends or mid-feed gives L/2.

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DENO LED Lighting builds flexible linear lighting in its Foshan factory to the numbers these calculators produce.

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Frequently asked questions

Why does the end of my LED strip look dimmer?

Voltage is lost in the copper of the flexible circuit as current travels along the run, so the far end receives less voltage on a constant-voltage strip.

Is 24V or 48V better for long LED strip runs?

A higher system voltage carries the same wattage at lower current, so voltage drop is smaller and the run can go further from one feed.

How does copper thickness affect voltage drop?

Thicker copper has lower resistance. Double-sided builds such as 35+70 µm or 30+105 µm lose less voltage per metre than thinner circuits.