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Gutter Calculator

Calculate the linear feet of gutter needed based on your roof's eave length.

Result

Gutter Sections Needed
12
Total Gutter Length
120 ft (37 m)

Measure the total length of every eave (roof edge that sheds water) around the house, not just one side.

About the Gutter Calculator

Gutters are sold in fixed section lengths, so a linear-foot total needs to be converted into whole sections before it translates into an actual materials list at the store.

How It Works

The calculator divides your total eave length by the gutter section length to find how many sections to buy, while also converting the total to meters for reference.

sections = total eave length ÷ section length

Examples

A typical single-story home

120 ft of total eave length with 10 ft sections needs 12 sections of gutter.

A larger home with more roofline

180 ft of eave length with the same 10 ft sections needs 18 sections, and likely more downspouts to handle the added drainage area.

Advantages

  • Converts a linear-foot total directly into a purchasable section count
  • Shows results in both feet and meters
  • Simple two-field input for a fast material estimate

Common Mistakes

  • Measuring only one side of the house instead of the full eave perimeter
  • Forgetting to budget separately for corner pieces, end caps, and downspouts
  • Including rake edges in the eave measurement when they don't need gutters

Edge Cases to Watch For

  • Only eaves, the horizontal roof edges where water actually runs off, need gutters; rake edges on a gable roof shed water sideways and don't get gutters.
  • Corner miters, end caps, and downspout drops use extra material beyond the straight run length calculated here.
  • Long gutter runs need a slight slope toward the downspout for proper drainage, which affects installation but not the total material length needed.

Common Use Cases

  • Estimating gutter sections needed for a full replacement
  • Budgeting a new gutter installation on an addition
  • Planning material needs before a DIY gutter project
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Do I need gutters on every side of the roof?

Only along eaves where water actually runs off - rake edges (the sloped sides of a gable roof) don't need gutters since water sheds toward the eaves, not off the rakes.

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Conclusion

Section count is simple division once the true eave length, not the full roofline, is measured correctly. Budget separately for corners, end caps, and downspouts, since none of those are captured in the straight-run material total.