Disclaimer

The calculators and content on GutterCalcs.com are provided for general information and planning.

Estimates and quantity/sizing guides, not guarantees

Results are deterministic estimates from your inputs, your prices and standard reference conventions (linear feet = Σ eave runs; effective area = footprint × pitch factor; the smallest size whose drainage area ≥ that area; downspouts / sections / hangers by ceil; rainwater gallons = area × inches × 0.6234 × runoff; cost = quantity × your $/unit + downspouts + labor + add-ons, ×(1 + contingency)). Real projects vary — verify measurements and figures before relying on them.

Not a bid, not a price index

Cost tools give planning estimates from your own prices, not bids or contracts, and we store no live material or labor price list, no regional cost index, no product catalog and no contractor directory. Cost bands are a labeled sanity guide only. Get itemized written quotes from licensed, insured gutter contractors.

Measure & confirm; order extra

Quantity and sizing tools give material-quantity guides. Measure your eave runs and confirm capacity, spacing and coverage against the exact product you buy, and order a little extra (~5–10%) for corners, waste and slope — sizes, capacities, spacings and panel lengths vary by product and brand.

Labeled typicals, not a certified design

Roof-pitch multipliers, rainfall intensity, drainage-per-size, downspout capacity, hanger spacing and cost bands are labeled industry planning typicals — confirm against local code and the manufacturer’s data. Actual gutter sizing depends on local rainfall intensity, roof geometry, valleys and debris. Structural roof-load, ice-dam / heat-cable and foundation/yard drainage are set by code and a professional — check with a pro; this site does not engineer them.

Anti-overlap: rain-gutter size, quantity & cost only

This site covers residential rain-gutter size, quantity and cost math only — the drainage system mounted at the eave. It is not a roofing / shingle / metal-roof / underlayment / roof-replacement resource and not a siding / fascia-soffit cladding resource (fascia appears only as the gutter mounting surface in a cost add-on); not an attic / roofline thermal insulation resource; not a foundation / basement / French-drain / sump or yard-grading drainage resource (the downspout tools stop at the discharge point 4–6 ft from the wall); not a general landscaping / rain-garden / irrigation resource; not a concrete splash-block / flatwork resource; and not an interior-plumbing / storm-sewer pipe-sizing resource.

Not a code, engineering or stormwater resource

We do not provide structural roof-load, ice-dam / heat-cable engineering, code-compliance certification or professional stormwater-drainage design. Defer these to your local code and a licensed, insured contractor or a certified professional.

Not an install or safety guide

Nothing here is an install procedure, a structural or engineering determination, or safety advice — working at height on gutters is a fall risk. Defer the professional install to a licensed, insured gutter contractor and confirm code with your local building department.