Input Span & Pitch of your roof to quickly get bevel angles for:

Common rafter length
Common rafter Plumb Cut
Hip rafter Plumb Cut
Hip rafter length
Hip rafter backing angles
Hip rafter backing depth
Hip rafter cheek angles
Jack rafter side cut angle
Backing depth (22mm from hip centre)
Enter pitch to get rise
Enter rise to get pitch

All dimension's are taken on measuring line as shown on diagram.