FREE GUTTER SIZING TOOL FOR PORTLAND HOMES

Roof Runoff & Gutter Sizing Calculator for Portland Homeowners

Find The Perfect Gutter Size For Your Portland Home And Prevent Costly Rain Damage Fast
GUTTER SIZING CALCULATOR

Calculate the Right Gutter Size for Your Home Instantly

Get fast, accurate runoff estimates and gutter size recommendations based on your roof and rainfall—no contractor needed.

Fast, Accurate Runoff Estimates

Get real roof runoff calculations in seconds using proven sizing methods.

5" or 6" Gutter Recommendation

Instantly see which gutter size fits your roof, pitch, and rainfall load.

Downspout Count & Layout

Know exactly how many downspouts you need and where they should go.

DIY-Friendly Guidance

Simple, clear results designed for homeowners—not engineers.

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Book a gutter cleaning, installation, or repair service with our easy online scheduler.

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Get a free, no-obligation estimate for your gutter project from our local experts.

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Find helpful gutter tips, maintenance advice, and seasonal home-care information.

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Why Portland And Vancouver Homeowners
Choose All Season Gutters & Roof Care

From gutter installation to roof cleaning and repair, our Portland-based team provides dependable, long-lasting protection for your home. We serve Portland, Beaverton, Tigard, Hillsboro, Lake Oswego, and Vancouver WA with care, craftsmanship, and local expertise.

Seamless Gutters Built For Local Rain

Custom-formed gutters made to handle heavy Pacific Northwest rainfall. Fewer leaks, better pitch, and color-matched options for your home’s trim.

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Preventative Roof Care That Extends Life

Stop roof leaks, moss, and overflow before they start. Seasonal cleaning and inspection help you protect your home and avoid costly repairs.

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Thorough Pressure Washing For A Fresh Look

Revitalize your siding, walkways, and driveways with safe, high-quality pressure washing that removes moss and grime for lasting curb appeal.

Pressure Washing Services

Dependable Gutter Repair When You Need It

We repair leaks, loose sections, and drainage problems fast. Trusted by homeowners across Portland and Vancouver for reliable, same-week service.

Fix My Gutters
Free Estimate Serving Portland, Beaverton, Tigard, Hillsboro, Lake Oswego, and Vancouver WA.

Family-Owned • Serving Portland Metro Since 1997

Our Values—Built Around Your Home’s Protection

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.

Experienced Since 1997

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.

Fair, Transparent Pricing

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.

Fast Scheduling

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.

Relationships First

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.

Licensed & Insured 5" & 6" K-Style • Fascia-Style Gutters • Guards • Cleaning • Repair

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24023 NE Shea Ln, Suite 204 >Wood Village, OR 97060

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503-860-6950
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Email Us

info@allseasongutters.com
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Get in Touch Today

Reach out to us for seamless gutter solutions and dependable roof care services today.

Frequently Asked Questions About Gutter Sizing, Roof Runoff, and Downspouts in Portland

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.

 

Gutter Sizing Calculator

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.​

 

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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.

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