Map every run onto every circuit and check the total against the 80% rule, with SPT-wire and LED line-length flags. The tool that keeps opening night lit.
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A 15-amp circuit safely carries 12, and incandescent C9s eat that fast. Plan runs per circuit, see the margin, and get flagged before the walkway timer takes down the roofline.
More free holiday lighting tools: Roofline estimator · Tree & wrap calc · Bulb lab · Cord & gauge advisor · Install time · Timer & zones · Client storage book · the full lights bench · all free tools
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<iframe src="https://getcrewplate.com/embed?trade=lights&tool=load" width="100%" height="1150" style="border:1px solid #CBD5E1;border-radius:10px" loading="lazy" title="Circuit load planner"></iframe> <p style="font:12px/1.5 system-ui;color:#64748B;margin:6px 0 0">Calculator by <a href="https://getcrewplate.com/free-tools">Crewplate</a> — 26 free trade calculators</p>