Gutter Length & Downspout Flow Calculator

Estimate linear feet of gutters and downspout drainage requirements.

Interactive Material & Cost Estimator

Coverage Rate Mode • Linear Feet

1. Select Project Area Shape

Length (Feet)

Width (Feet)

Waste / Cut / Compaction Buffer

2. Select Package / Unit Size

Price / Unit ($)

Contractor / Bulk ($)

Delivery ($)

Estimated Material Needed 1,500 sq ft (+10% buffer)

Net + Buffer Area 1,650 sq ft 1,500 base sq ft

Coverage Per Package 10 sq ft per unit (10 ft sections)

Total Units / Packages to Buy 166 10 ft sections

Waste Buffer Included +10% included

Estimated Project Material Cost 166 10 ft sections

Retail Package Total $2486.68 Before local sales tax

With Delivery / Bulk $2486.68 Direct store pickup

Instant pre-calculated material estimates for common US residential project sizes before compaction buffer:

Typical US Project	Area	Depth	Volume	Weight	Store Bags
Standard Home Roof Eaves (120 linear ft)	120 linear ft eaves	6" Gutters	12 Sections (10 ft)	80 lbs	12 gutter sections + 4 downspouts

Gutter Length = Total Roof Eaves Perimeter; Downspouts = 1 per 600 sq ft roof drainage

Calculates total linear feet of seamless gutters and downspout drop outlets based on US regional rainfall intensity.

Upgrade to 6-inch K-style gutters and 3x4 inch downspouts if your roof has steep pitches or you live in an area prone to torrential downpours.

As a general rule, install one downspout for every 600 to 800 square feet of roof area.