Rafter & Pitch Calculator

Hover or click inputs to find them on the framing schematic.

1. Input Dimensions & Pitch

Distance Between Frame (Span)

Inches (Distance wall-to-wall)

Ridge Thickness

Inches (Standard ridge board thickness)

Pitch (/12)

Inches of rise per 12 inches of run

Top Plate Width

Inches (Wall plate + sheathing width)

Overhang

Inches (Horizontal overhang width)

Step 4[cite: 1] 0.00" Rafter Hypotenuse[cite: 1]

Step 6[cite: 1] 0.00" Plate Hypotenuse[cite: 1]

Step 8[cite: 1] 0.00" Tail Hypotenuse[cite: 1]

Rule of Thumb: The Bird's mouth cut should not remove more than 1/3 of the material thickness to maintain structure[cite: 1].