Constant-voltage LED strips. Results update as you type.
Start from a common setupShown on your power supply or strip packaging. Higher voltage runs farther.
On the strip's spec sheet or box. Common: 4.8 (dim) / 9.6 (medium) / 14.4 (bright) / 19.2 W/m (very bright).
The total length of one strip, from the power supply to the far end.
If you wire power into both ends, the drop falls to about a quarter.
Units: . The calculation always runs in metres internally; this only changes what you see.
The defaults are correct for most strips (8–10 mm wide, 2 oz copper). Changing them matters mainly when the strip is unusually cheap, unusually thick, or installed somewhere hot. If you are unsure about any field below, close this section and keep the defaults.
Thicker copper means less drop. Budget strips usually cut costs here.
The metal strip inside, not the whole PCB width. Usually 3.5–5 mm.
Use the temperature inside the channel, which runs hotter than the room. 25°C = open air, 35°C = enclosed profile, 45°C = sealed outdoor.
What the light will actually look like
| Voltage reaching the far end | — |
| Total current drawn (for choosing your power supply) | — |
| Wasted as heat instead of light | — |
—
Brightness shading is drawn from the calculated voltage at each point along the run. Real LED output also shifts warmer in colour as voltage sags, so a run near the limit often looks worse than this preview suggests.
Model: distributed load on copper traces, both rails counted, resistivity corrected for temperature. Assumes uniform watts per metre and a constant-voltage strip. For addressable (SPI) strips, enter the full-white figure to get the worst case.
