Gutter length, downspout, and fascia calculators. Browse our free gutters tools below — all calculators are instant, accurate, and require no sign-up.
Fascia Board Calculator — Calculate fascia board material needed for eave edges. Estimates board count, linear feet, and optional fascia cover/wrap from perimeter measurements.
Downspout Count Calculator — Calculate the number of downspouts needed based on roof drainage area, gutter length, and rainfall intensity. Includes downspout sizing guidance.
Gutter Size Calculator — Determine the right gutter size based on roof area and local rainfall intensity. Compare 5-inch and 6-inch K-style gutter drainage capacity.
Gutter Length Calculator — Calculate gutter length needed for all eave edges. Estimates sections, hangers, inside/outside corners, end caps, and seamless gutter total footage.