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Measuring guide

How to Measure a Roofline for Christmas Lights

Quick answer

To measure a roofline for Christmas lights, add up the length of every edge you'll light: eaves, gable rakes, ridges and peaks. Measure level eaves directly (tape, satellite or photo) and measure sloped rakes at their true sloped length: multiply the horizontal run by the pitch factor (1.12 for a 6:12 roof, 1.20 for 8:12, 1.41 for 12:12).

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How to measure a roofline for lights

  1. 1

    List the runs

    Decide what gets lit: front eave, garage eave, gables and peaks, second-story eaves, ridges, porches.

  2. 2

    Measure level eaves

    Use a tape or wheel at ground level along the wall under each eave, or trace the eave on satellite.

  3. 3

    Measure sloped rakes

    Measure the horizontal run of each gable side and multiply by the pitch factor to get the true length.

  4. 4

    Add connection runs

    Add feet for wire runs to the outlet or controller and any jumps between sections.

  5. 5

    Total and round up

    Add everything up and round up to your light strand or channel lengths.

Roof pitch factors for gable and rake runs

Roof pitchMultiply horizontal run by
4:121.05
5:121.08
6:121.12
7:121.16
8:121.20
9:121.25
10:121.30
12:121.41

Three ways to measure

  • Tape measure or wheel: most direct, but needs a site visit and gables are hard to reach.
  • Satellite tracing: fast and remote; set the roof pitch so sloped runs are counted at true length.
  • Front-photo measuring: scale the photo from a known object like a 16 ft garage door and trace the facade, which captures gables and peaks the homeowner actually sees.

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Measure the roofline, show the homeowner their house lit up and send the estimate, all in one app. $50/month for 2 users after a 14-day free trial. $0 today.

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Measure remotely with LightingBid Pro

LightingBid Pro combines satellite tracing with pitch correction and perspective-corrected front-photo measuring, and it can suggest roofline runs with AI measure. Every run becomes a zone with its footage, and the total flows into your estimate.

Frequently asked questions

How many feet of Christmas lights do I need for my roofline?

Measure the length of every edge you'll light and add them up, using the sloped length for gables. Many single-story homes need roughly 100–200 feet, and two-story homes more.

How do I measure a gable for lights?

Measure the horizontal width of the gable, divide by two for each side, multiply each side by the pitch factor (for example 1.12 for 6:12), and add both sides.

Can I measure my roofline from satellite?

Yes, for level eaves. For sloped runs, a satellite view shows only the horizontal distance, so apply a pitch factor or use a tool that does it for you.

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Measure it. Show it. Win it.

Measure the roofline, show the homeowner their house lit up and send the estimate, all in one app. $50/month for 2 users after a 14-day free trial. $0 today.

Start your free trial See how it works