Are you a subscriber but don’t have an online account?

Register for full online access.

 
 
 
 
+ Reply to Thread
Page 1 of 2 12 LastLast
Results 1 to 15 of 20
  1. #1

    Default Degrees to Pitch conversion

    Does anyone know the math formula to convert the angle of a roof in degrees to X in 12 pitch?

  2. #2
    Join Date
    Sep 2004
    Location
    North Jersey
    Posts
    229

    Default Re: Degrees to Pitch conversion

    If you have a construction master calculator it will do it for you. If not PM me and I'll do it on the calc.

  3. #3
    Join Date
    Jun 2004
    Location
    Westchester,NY
    Posts
    53

    Default Re: Degrees to Pitch conversion

    Divide the rise by the run and take inverse tangent of that and it will spit out the degrees.

    Kris M.

  4. #4
    Join Date
    Jun 2004
    Location
    Caldwell, NJ
    Posts
    3,153

    Default Re: Degrees to Pitch conversion

    Quote Originally Posted by Barry Dennis View Post
    Does anyone know the math formula to convert the angle of a roof in degrees to X in 12 pitch?

    Barry,

    Using a Scientic calculator or Construction Master Calculator. Press the Tan button for any given degree on the plans and multiply by 12 and that will be your pitch.



    A Construction Calculator is the easiest one to use.

    If you were given a 22.62° pitch on a set of plans, you can this.

    22.62 [Pitch] [Pitch] Returns -5 (5/12 is your pitch)



    If you have a scientific calculator you can do this.

    22.62 [Tan] x 12 = 5 (5/12 is your pitch)

    45 [Tan] x 12 = 12 (12/12 is your pitch)
    Joe Carola

  5. #5
    Join Date
    Jun 2004
    Location
    Caldwell, NJ
    Posts
    3,153

    Default Re: Degrees to Pitch conversion

    Quote Originally Posted by Kris M View Post
    Divide the rise by the run and take inverse tangent of that and it will spit out the degrees.

    Kris M.
    Kris,

    That's only good if your given the rise. I've had some plans that don't give you the pitch or rise , they just give you the degrees of a roof.
    Last edited by Joe Carola; 10-29-2006 at 06:49 AM.
    Joe Carola

  6. #6
    Join Date
    Jun 2004
    Location
    Little River, SC
    Posts
    1,234

    Default Re: Degrees to Pitch conversion

    You could just look on the speed square. The pitches & angles are listed on the square & in the book that comes with it.
    Two roads diverged in a narrow wood. I took the path less traveled.
    http://renov8u2.com
    http://reverbnation.com/cortezthekillers

  7. #7
    Join Date
    Jun 2004
    Location
    Oakhurst, CA (near Yosemite Natl Park)
    Posts
    1,562

    Default Re: Degrees to Pitch conversion

    this is handy
    Attached Images Attached Images
    www.telianconstruction.com
    Criticism comes easier than craftsmanship. - Zeuxis, 400 B.C.

  8. #8
    Join Date
    Jun 2004
    Location
    Caldwell, NJ
    Posts
    3,153

    Default Re: Degrees to Pitch conversion

    Barry, What are you using to figure your rafters now?

    Are you using a Scientific Calc, Construction Master Calc, Framing Square?
    Joe Carola

  9. #9
    Join Date
    Jun 2004
    Location
    Caldwell, NJ
    Posts
    3,153

    Default Re: Degrees to Pitch conversion

    Barry,

    Just to give you an example of how you can use Construction Master Trig Calculator.

    If you were give a pitch of 22.62° on a set of plans and your common rafter run was 16’ for example without a ridge deduction, you can do this:

    Using a Construction Master with Trig:

    22.62 [Pitch]

    16 [Feet] [Run]

    [Diagonal] = 17’ 4” (Common Rafter Length)


    Or you can do this:

    16 [Feet] [÷] 22.62 [Cosine] = 17’4” (Common Rafter Length)
    Joe Carola

  10. #10

    Default Re: Degrees to Pitch conversion

    Thanks Everyone, I do remodel projects and run into some oddball pitches so I use a Stabilla electronic level which give me the degrees. I've used the speed square to convert to pitch, but if the roof is an oddball, I need to guess at the pitch (sometimes I need to hit an existing height). I use the step-off method to layout rafters.

  11. #11

    Default Re: Degrees to Pitch conversion

    Perhaps this print out will help?

    Best of luck,
    Attached Files Attached Files

  12. #12
    Join Date
    Mar 2005
    Location
    Sol III
    Posts
    1,935

    Default Re: Degrees to Pitch conversion

    Barry, if you are given only the measurement in degrees, since the tangent of an angle is the rise/run you can use this series to solve for Tangent of an Angle.
    Be sure you multiply the value of the angle (x in the formula) in degrees by pi/180 to convert it to radians before substituting.
    It's a good formula to know if you don't have a calculator but keep a box of pencils and a ream of paper handy ...
    Quote Originally Posted by Barry Dennis
    Does anyone know the math formula to convert the angle of a roof in degrees to X in 12 pitch?
    EDIT: You asked for the "Over 12" value, so after you are done cyphering multiply the result returned by the tangent formula by 12.
    Last edited by Joe Bartok; 11-07-2006 at 03:20 PM.
    "I cannot teach anyone anything; I can only make them think." - Socrates

  13. #13
    Join Date
    Oct 2005
    Location
    off the coast of new england
    Posts
    515

    Default Re: Degrees to Pitch conversion

    Curtis , welcome to the fold

  14. #14
    Join Date
    Sep 2004
    Location
    Mid Hudson Valley
    Posts
    314

    Default Re: Degrees to Pitch conversion

    Call me Old School, but why not just use a square to begin with? if the slope is 5 3/16 on 11 who cares, measure the run off your square and make pitch blocks to set your saws if need be. It doesn't need batteries and it is always right.

  15. #15
    Join Date
    Feb 2006
    Location
    San Diego (Northern Mexico)
    Posts
    3,976

    Default Re: Degrees to Pitch conversion

    Good info. but I still haven't figured out why it's on the Estimating & Mark-up forum.
    Tom

    Support your country always, support your government only when they deserve it! - Mark Twain
    This fall, fire them all, DON'T RE-ELECT ANYONE!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts