Calculate gutter run lengths, downspout locations, end caps, and mounting brackets needed for residential gutters.
🌧️ Gutter & Downspout Calculator
Gutter Length
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Downspouts (10ft each)
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Est. Cost ($8/ft installed)
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💡 Pro Tip
Gutters must slope downward toward the downspout. The standard pitch is 1/4 inch of fall for every 10 feet of gutter run. Check with a level to avoid pooling water.
Frequently Asked Questions
Q: How many downspouts do I need?
You need one downspout for every 30 to 40 linear feet of gutter run. If your roof area is very large, add extra downspouts to prevent overflow.
Q: What is the standard gutter size?
5-inch K-style gutters are the residential standard. For larger roofs or steep pitches, step up to 6-inch gutters for 50% more water volume capacity.
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