Free OnlineCalculators & Converters
Gutter Calculator
Calculate gutter linear footage, downspout count, hangers, and elbows needed for any house.
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Key Features — Gutter Calculator
Gutter footage from house dimensions
Downspouts by spacing
Total downspout footage
Hangers and elbows
K-style and half-round
Why Use This Tool — Gutter Calculator
Free Online Gutter calculatorHow much gutter do i need — for EveryoneFast & Easy Downspout calculatorGuttering calculator — 100% FreeFree Online Rain gutter calculator
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Works Everywhere
Use on any device — desktop, tablet, or phone. No downloads or plugins needed.
Frequently Asked Questions — Gutter Calculator
How much gutter do I need?
2 × (Length + Width) of house = total gutter footage. 40×28 house → 136 linear ft. Add 10% for overlaps.
Downspout spacing?
Every 30–40 ft. Gutter over 40 ft without a downspout can overflow in heavy rain.
What gutter size?
5" K-style handles most homes up to 5,500 sq ft drainage area. 6" for larger or steeper roofs.