Steps Involved in Building a HouseSpike's Calculators

Rafter Length Calculator

Calculate the length of a rafter from roof pitch and a length measurement. Includes result for hip/valley factor, slope factor and the roof angle in degrees

Spike's Calculators

If using a ridge board subtract half its width from the rafter length

Length ft    in
Roof Pitch 12
Overhang inch


Roof Angle: °
Slope Factor: #
Hip and Valley Factor #
Rafter Length In Decimal Feet ft
Rafter Length Feet     Inches


  1. length in feet and inches
  2. pitch of the roof
  3. length of overhang in inches


  1. the angle of the roof in degrees
  2. slope factor (for common rafter)
  3. hip/valley factor
  4. length of rafter in decimal feet
  5. length of rafter in feet and inches

    Visit us on facebook.png

If you have any questions or comments please Contact Us

© 1998, VmNet.