Roof Overhang Calculator

Ideal Eave Depth for Your Climate Zone

The Roof Overhang Calculator recommends the ideal eave overhang depth for your home based on wall height, latitude, and climate zone. Properly sized overhangs block summer sun (when angle is high) while allowing winter sun (when angle is low) to enter south-facing windows — a passive cooling strategy that can cut HVAC costs significantly. Typical overhangs range from 12" in tight urban lots to 36"+ in hot southern climates. Enter your inputs and the tool returns the recommended overhang plus rafter tail length.