Drip Edge Calculator
Enter your eave and rake lengths to calculate total linear footage, number of drip edge pieces, and how many bundles to order — including overlap and waste.
Eaves vs. rakes — what's the difference?
Eaves are the horizontal bottom edges of the roof — where gutters attach. Rakes are the sloped edges on the gable ends. Both need drip edge, but eave drip edge goes on first (under the underlayment), while rake drip edge goes on last (over the underlayment).
Standard overlap and installation
Drip edge pieces should overlap by at least 2 inches at each joint. On eaves, nail every 8–10 inches. On rakes, nail every 12 inches. Most codes require drip edge on all roof edges — check local requirements as some areas specify minimum flange width.
8 ft vs. 10 ft pieces
8-foot drip edge is the most widely available size at lumber yards and home centers. 10-foot pieces mean fewer joints on long runs, which is faster to install and can look cleaner. Metal drip edge is typically sold in bundles of 10 pieces at most suppliers.