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Gutter Sizing Calculator
Use this Portland gutter size calculator to estimate whether your home needs 5K, 6K, or 6 inch fascia gutters based on roof size, pitch, rainfall, and downspout layout.
Calculate how much rain your roof needs to move during heavy Pacific Northwest weather.
Compare common seamless gutter options based on roof size, pitch, rainfall load, and drainage demand.
Estimate how many downspouts your home may need to reduce overflow, pooling, and foundation drainage problems.
Understand whether your Portland home may need standard gutters, larger gutters, or extra drainage capacity.
Book a gutter cleaning, installation, or repair service with our easy online scheduler.
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Portland rain, moss, fir needles, roof valleys, and clogged downspouts are hard on a home’s exterior. All Season Continuous Gutters & Roof Care helps homeowners protect fascia, siding, foundations, and rooflines with properly installed seamless gutters, gutter cleaning, gutter repair, gutter guards, pressure washing, and roof care.
Seamless 5K, 6K, and fascia-style gutter systems formed to fit your roofline, pitched correctly, and sized for heavy Portland rain. A better layout means fewer leaks, cleaner roof edges, and better water control around the foundation.
See Portland Gutter InstallationWe clear packed gutters, roofline debris, outlets, and downspout blockages before water backs up under shingles, spills behind gutters, stains siding, or pools near the foundation.
Schedule Gutter CleaningLoose gutters, leaking corners, sagging runs, failed outlets, and poor downspout placement can damage fascia and siding fast. We repair the problem instead of just hiding the symptom.
Fix My GuttersPortland gutter guards need to match the debris pattern. We help homeowners reduce clogs from maples, fir needles, roof grit, and moss without pretending any guard system is maintenance-free.
Explore Gutter GuardsRemove moss, grime, algae, and slippery buildup from exterior surfaces with careful cleaning methods that improve curb appeal without damaging the home.
See Pressure WashingThe right gutter system protects more than the edge of the roof. It helps move water away from fascia, crawlspaces, basements, siding, walkways, and landscaping during long wet seasons.
Request A Free EstimateTell us what is happening: overflow, leaks, clogged downspouts, moss, old gutters, or water draining too close to the house. We will help you find the right next step.
Family-Owned • Serving Portland Metro Since 1997
All Season Continuous Gutters & Roof Care delivers proven workmanship and friendly service. We focus on clear pricing, fast scheduling, and long-term relationships across Portland and Vancouver.
Thousands of installs and repairs across Portland, Beaverton, Hillsboro, Tigard, Lake Oswego, and Vancouver WA. We size, pitch, and place outlets for real Northwest rain so water moves off your home reliably every storm.
Clear written estimates with options that fit your home and budget. Customers choose us for some of the best prices in the Portland Metro—while still getting premium materials, neat workmanship, and results that last season after season.
Need help soon? We offer same-day or next-day availability when possible and always communicate realistic timelines. You’ll know what to expect and when, with photos and updates from our crew as the work progresses.
We answer questions, show before-and-after photos, and stand behind every job. Most work comes from repeat clients and referrals because we treat your home like ours and follow up long after the ladders come down.
The right gutter size depends on your roof area, slope, and how much rain your home typically gets. In Portland, where heavy seasonal rainfall is common, most homes benefit from 5” or 6” K-style gutters. To get an accurate answer, use our Roof Runoff & Gutter Sizing Calculator — it uses your roof size, pitch, and ZIP code to calculate how much water your gutters must handle. This ensures your system is properly sized for Portland’s climate and helps prevent overflow or foundation damage.
To measure your roof pitch, place a level horizontally against the roof and measure the rise in inches for every 12 inches of run. For example, a 6:12 pitch rises six inches for every foot of run. Enter that into the calculator as “medium pitch.” If you’re not comfortable climbing a ladder, you can estimate based on your home’s appearance or contact All Season Continuous Gutters & Roof Care for a free on-site evaluation — we can measure your roof and confirm your gutter needs.
The number of downspouts you need depends on your total roof runoff and gutter capacity. Most Portland homes need one downspout for every 30–40 feet of gutter, but homes with steeper roofs or multiple roof planes may require more. Our calculator quickly estimates the total gallons per minute (GPM) your roof produces during rainfall and tells you exactly how many downspouts to install for proper drainage and protection.
Absolutely. Whether you’re replacing old gutters or upgrading to a larger size for better performance, our calculator helps you plan accurately before you buy. Just enter your ZIP code, roof square footage, and pitch - the tool will estimate flow rate, recommend a gutter size, and calculate the right number of downspouts for optimal drainage. It’s ideal for homeowners in Portland, Beaverton, Tigard, and surrounding areas looking to protect their property from Oregon’s heavy rainfall.
Portland’s consistent rain means your gutters must handle large volumes of water efficiently. Undersized gutters can overflow, causing roof rot, siding damage, and foundation issues. Properly sized gutters and downspouts channel water safely away from your home, extending the life of your roof and structure. Our free online Gutter Sizing Calculator makes it easy to get Portland-accurate results — no guesswork, no spreadsheets, just reliable sizing based on real drainage science.
For Portland’s rainy, often windy climate, seamless aluminum gutters are the most popular and practical choice. They’re rust-resistant, lightweight, and custom-fit to your home, reducing the risk of leaks. A K-style gutter is ideal for handling heavy runoff while maintaining a clean, modern look that complements most Northwest homes. If your home has large roof sections or steep slopes, 6-inch gutters provide the extra capacity needed for heavy rainfall.