Rafter Tools is an android app with functions to calculate complex roof framing angles that other roof framing calculators can't and don't offer. Calculating common rafters with a construction calculator is fairly easy, but to be a master carpenter you need more roof framing angle information then the construction calculators offers. With the Rafter Tools android app you'll be able to calculate all of the complex angles for roof framing.

The app's main screen uses a left swipe motion to display all of the different calculators.
See my Roof Framing Geometry Blog for A Complete list of the 39+ calculators in Rafter Tools for Android.

http://sbebuilders.blogspot.com/2013/07/rafter-tools-for-android-version-256.html

Current version 2.62 functions supported:
Irregular Hip Rafter function With UnEqual Overhang
Irregular Hip Rafter function With Equal Overhang

Hexagon Rafter Angles & Lengths
Octagon Rafter Angles & Lengths
Dodecagon Rafter Angles & Lengths
Polygon Rafter Angles & Lengths
Octagon Roof Framing 4 Butt Hip Rafter Method
Octagon Roof Framing 4 Butt Hip Rafter Method with Purlin Structural Ring
Octagon Roof Framing With Hip Rafters Mitered
Octagon Roof Framing with Gazebo Cupola
Bay Window Roof Rafters
California Bay Window Hip Rafters
Frieze Block Miter Angles
Purlin Rafter Angles
Square Tail Fascia Angles
Timber Framing Angles
Hawkindale Angles
Standard Rake Walls
Hip Rake Walls Plan A Rotated into Roof Surface Plane
Hip Rake Walls Plan B Rotated into Roof Surface Plane
Hip Rake Walls Plan C Rotated into Roof Surface Plane
Carpentry Certification in roof framing Trigonometry and Geometry.
Tetrahedron Angles Calculator and Tetrahedron Framing Square Usage
French Compagnon Roof Framing Kernel Angles and Framing Square Usage to geometrically draw out a bastard hip using a framing square.
Dihedral Angle Calculator
Crown Molding Miter and Bevel Angles Calculator for Compound Miter Saw Settings and Rake Crown Molding Miter and Bevel Angles,Polygon Crown Molding Miter and Bevel Angles, Radius Bullnose Crown Molding Miter and Bevel Angles and width, Horizontal to Rake Crown Molding Miter and Bevel Angles .
Hopper Angles
Unequal Pitched Gable Rafters with Unequal Plate Heights  
Jack Rafter Plumb Layout Marks on Hip Rafter
Alhambra Granada Ad Quadratum Ground Plan Roof Rafters
Hip/ Valley Rafter Roof Angles for equal and unequal roof pitches for any plan angle
Hip Rafter Backing Angles
Hip Rafter Plumb Backing Angle
Hip Rafter Side Cut Angles Peak of Hip Rafter
Hip Rafter Side Cut Angles Foot of Hip Rafter
Jack Rafter Side Cut Angles
Roof Sheathing Angles
Hip Rafter Purlin Housing Angles
Hip Rafter Diamond Post Miter & Saw Blade Bevel Angles
Plywood Roof Sheathing Offset Cut Line
Valley Sleeper Miter & Saw Blade Bevel Angles
Dormer Square Tail Miter & Saw Blade Bevel Angles
Purlin Layover cut perpendicular to roof surface plane

Segmental Arches
Gothic Arches
Lofting -- Plotting Ellipses for Arches or Groin Vaults
Groin Vault Plotting -- Lofting Equal Height Ordinates

Clipped Hip Rafter Octagon Roof Framing
Prow Rafter Roof Framing Angles
Law of Sines Formulas Reference Sheet
Pyramid Hip Roof Framing for Bastard Hip Roofs
CutIn Dormer Shed Roof Rafter Calculator
Pitch Break Shed Roof Rafter Calculator
Dormer Shed Roof Rafter Calculator
dévers de pas angles for WorldSkills Carpentry Competition
Circular Stairs
Spiral - Helical Stairs
Tangent Hand Railing
Gambrel Roof with Crow's Beak
Trapezoid With Unequal Overhang
Trapezoid With Equal Overhang
Platonic Solids
Archimedean Solids
Barrel Roof Dormer
Eyebrow Roof Dormer

User input modes
Imperial/English/Metric/Base 10
Display output modes
Imperial/English/Metric/Base 10

Display and input modes can be completely different.

The app's main screen uses a left swipe motion to display all of the different calculators.