5-Inch vs 6-Inch Gutters
One inch makes a 40% difference in water capacity. Complete comparison of cost, performance, and sizing to protect your home from water damage.
5-INCH
$6 – $12
per linear ft installed
Capacity
~1.2 gal/ft
Drainage
~5,500 sq ft roof
Downspout
2" x 3"
Best For
Average homes
Best for: Moderate rain, small-to-mid homes, proportional aesthetics
6-INCH
BEST FOR MOST
$8 – $16
per linear ft installed
Capacity
~2.0 gal/ft
Drainage
~7,960 sq ft roof
Downspout
3" x 4"
Clog Resist.
Better
Best for: Large roofs, heavy rain areas, steep pitch, tree cover
Head-to-Head Comparison
| Feature | 5-Inch Gutters | 6-Inch Gutters |
|---|---|---|
| Water Capacity | ~1.2 gallons/ft | ~2.0 gallons/ft |
| Drainage Rate | ~5,500 sq ft roof area | ~7,960 sq ft roof area |
| Cost (per linear ft) | $6 – $12 | $8 – $16 |
| Downspout Size | 2" x 3" | 3" x 4" |
| Visual Scale | Proportional on most homes | May look large on small homes |
| Clog Resistance | Standard | Better (wider opening) |
| Best For | Average homes, moderate rain | Large roofs, heavy rain, steep pitch |
Pros & Cons
5-Inch Gutters
Advantages
- ✓20–30% cheaper in materials and installation
- ✓Better proportions on homes under 2,000 sq ft
- ✓Standard residential size with most accessories
- ✓Adequate for most homes with normal rainfall
Disadvantages
- ✗Overflows during intense storms on large roofs
- ✗Narrower opening catches leaves more easily
- ✗2x3 downspouts bottleneck during heavy rain
6-Inch Gutters
Advantages
- ✓40% more water capacity, reduces overflow
- ✓Essential for homes over 2,500 sq ft
- ✓3x4 downspouts drain water much faster
- ✓Wider opening lets small debris wash through
- ✓Required by code in some heavy-rainfall regions
Disadvantages
- ✗25–35% more expensive total system
- ✗Can look oversized on small/ranch homes
- ✗More water weight stresses hangers and fascia
Cost Comparison (150 linear feet)
| Component | 5-Inch | 6-Inch |
|---|---|---|
| Gutters (installed) | $900 – $1,800 | $1,200 – $2,400 |
| Downspouts (4–6) | $200 – $500 | $300 – $700 |
| Total | $1,100 – $2,300 | $1,500 – $3,100 |
Need help sizing your gutter system? See our guide to sizing gutters and downspouts.
Which Should You Choose?
Choose 5-Inch If...
- →Roof area under 2,500 sq ft
- →Moderate pitch (4/12 to 8/12)
- →Under 40 inches annual rainfall
- →Smaller ranch or Cape Cod style
- →Budget is the primary concern
Choose 6-Inch If...
- →Roof area exceeds 2,500 sq ft
- →Steep pitch (10/12+) accelerates runoff
- →Heavy-rainfall region (SE, Pacific NW)
- →Heavy tree cover causing debris clogs
- →Larger two-story with long rooflines
Frequently Asked Questions
Can I mix 5-inch and 6-inch gutters on the same house?
Yes. Some homeowners use 6-inch gutters on the back of the house (where large roof sections drain) and 5-inch on the front for better proportions. This is a practical compromise that saves money while ensuring adequate drainage where it matters most.
Do 6-inch gutters need different hangers?
Yes. 6-inch gutters require wider hangers rated for the increased weight when full. Spacing should be 24 inches on center (versus 32 inches for 5-inch). Use heavy-duty hidden hangers with structural screws into the rafter tails, not just the fascia board.
How do I know if my current gutters are too small?
Signs of undersized gutters include: water consistently overflowing during moderate rain, water stains on the fascia below the gutter, erosion trenches below the roofline, and basement or crawl space water intrusion. If you see these signs, upgrading to 6-inch may be the solution.
What about half-round gutters?
Half-round gutters are a different profile (U-shaped versus K-style). They hold roughly 40% less water than K-style of the same width. A 6-inch half-round holds about as much water as a 5-inch K-style. If you prefer the half-round aesthetic, size up accordingly.