Measure the roofline, pick bulb and spacing, and get the full materials list — bulbs, socket wire, clips, plugs — ready to copy into an order.
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120 feet of roofline at 15-inch spacing is a specific number of bulbs, a specific wire length and a specific clip count. The estimator does that arithmetic for every line you measure.
More free holiday lighting tools: Circuit load planner · 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=roof" width="100%" height="1150" style="border:1px solid #CBD5E1;border-radius:10px" loading="lazy" title="Roofline estimator"></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>