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How to Calculate the Angle of a Vaulted Ceiling?

A vaulted ceiling makes a strong architectural statement in a home, but mounting a ceiling fan on an angled ceiling requires more than your standard fan installation tools. When buying a new ceiling fan, confirm the fan is compatible with sloped mounting. Many ceiling fans are designed to fit sloped ceilings with angles, also known as a pitch, up to 30 degrees. However, if your ceiling has a pitch greater than 30 degrees, you will need a sloped ceiling adapter for a proper and secure installation.

A standard sloped ceiling adapter allows the ceiling fan to be installed on ceilings with pitches ranging from 31 degrees to 45 degrees. The Fanimation Fan Company produces a sloped ceiling kit for a 1-inch downrod that allows a fan to mount on a ceiling with a pitch up to 52 degrees.

Select a sloped ceiling adapter in a similar finish to your ceiling fan. To ensure compatibility, choose a sloped ceiling adapter from the same manufacturer as your ceiling fan. See Del Mar Fans & Lighting's selection of ceiling fan mounting systems, including sloped ceiling adapters.

    To determine if a sloped ceiling kit is necessary, gather the following materials and use the steps below to calculate the angle of the ceiling.

  1. Measure the height of the wall and the highest point of the ceiling.
  2. Measure the total length from the wall to the highest point of the ceiling.
  3. Use our calculator to find the slope or pitch of your ceiling.

Materials

  • Tape Measure
  • Pencil
  • Paper
  • Step Ladder

Step 1: Measure the Rise

The rise is the height difference between two walls. To find the rise, follow the steps below:

Using the tape measure, measure the height of the ceiling, from the highest point of the ceiling to the floor. Record this first measurement.

Measure The Highest Vertical Point

Using the tape measure, measure the height of the wall, from the floor to the lowest point of the ceiling (the spot where the wall and the ceiling meet). Record this second measurement.

Measure The Lowest Vertical Point

Subtract the wall height from the ceiling height to obtain the rise of the ceiling.

Step 2: Measure the Run

The run is the total length from the highest point to the lowest point on the ceiling. To find the run, follow the steps bellow:

From the same point where you measured the ceiling height, measure the horizontal distance from the floor to wall. This measurement is the run.

Measure The Horizontal Point

Step 3: Find the Slope with a Rise Over Run Calculator

Banner For Try Our Interactive Rise Over Run Calculator

Enter the rise and run measurements into the boxes below to find the slope of your ceiling.

The "rise" or height difference between the walls:
The "run" or length of the room:

If your room has a vaulted ceiling, choose a long downrod that allows the ceiling fan to hang at least 8 feet above the floor and the fan blades to hang a minimum of 7 feet from the floor. It is best to select a downrod from the same manufacturer as your ceiling fan to ensure compatibility. See Del Mar Fans & Lighting's selection of downrods.

After calculating the slope of your ceiling and choosing an adapter kit, consider buying a Remote controlled ceiling fan. Remote ceiling fans are ideal for reversing your ceiling fan from a hand held transmitter. When you have high ceilings reversing your ceiling fan in hard-to-reach locations.

Terry Butler
horizontal distance from floor to wall does not make sense
May 27, 2015 at 10:27 am
Del Mar Fans & Lighting
Hi Terry, Although it may sound confusing it's very simple. To get the run of your room you want to find the length of the slope. Starting at the wall with the lowest ceiling measure straight to the opposite wall with the highest ceiling. That measurement will be added into the the calculator as "run". I hope this helps!
May 27, 2015 at 12:23 pm
Del Mar Fans & Lighting
Hi Terry, Although it may sound confusing it's very simple. To get the run of your room measure horizontally from point a) the wall with the lowest point of ceiling to point b) the wall with the highest point of ceiling. I hope this helps!
May 27, 2015 at 12:38 pm
???? ??
thanx, but very little about standard roof pitch, check here http://myrooff.com/standart-roof-pitch/
October 16, 2015 at 12:09 pm
Sami Garshoni
What is the Mathematical calculation for working out the Ceilings angle. I need to do the calculation on the job site.
January 21, 2016 at 8:12 pm
Del Mar Fans & Lighting
Hi Sami, We've simplified the calculation for you. If you don't have access to our article from the job site you'll need a scientific calculator. The calculation is made with standard trig functions. The difference in the ceiling height(rise) will give you the opposite side, where the length(run) will give you the adjacent side. Finding the inverse tan will give us the angle, but ensure the calculator is using degrees and not radians. tan-1(opposite/adjacent)=slope in degrees. I hope this helps!
January 22, 2016 at 10:52 am
Grace Toninato
So if I have a 16 degree slope how long of a downrod do I need for a 60'' fan?
May 13, 2016 at 5:07 pm
Del Mar Fans & Lighting
Hello Grace, The combination of 16 degree pitch and a 60" ceiling fan should be overcome by, at least, an 18" downrod. I hope this helps!
May 13, 2016 at 5:25 pm
Grace Toninato
Del Mar Fans & Lighting Thank you!
May 13, 2016 at 5:48 pm
VoonPin Cheah
If i have a 21.04 degree slope and a 52 inch fan. how long of a downrod do i need?
June 1, 2016 at 11:15 am
VoonPin Cheah
the lowest wall is 8 feet and highest is 12 feet
June 1, 2016 at 11:16 am
Del Mar Fans & Lighting
Hi There! If the moutning box is split at 10ft, I recommend purchasing a 12" downrod for your room. I hope this is helpful!
June 1, 2016 at 12:31 pm
Jane P. Edelstein
I have a 13' sloped ceiling, but it has a straight beam across it on which the fan will be mounted. Do I could the extra foot up to the ceiling, or do I just measure up to the beam? How long a downroad, please?
June 23, 2016 at 11:12 am
Del Mar Fans & Lighting
Hi Jane, The recommended downrod length for a 13' ceiling is a 36" downrod. This will drop the ceiling fan to a reasonable height while still meeting NEC requirements.
June 23, 2016 at 11:56 am
Del Mar Fans & Lighting
Hi There! If the mounting box is split at 10ft, I recommend purchasing a 18" downrod for your room. I hope this is helpful!
July 1, 2016 at 5:19 pm
Ashraf Hameed
Sir, I am designing a ceiling fan blade so may i know, what rise angle, twist angle bend angle to get 380 RPM and 230 CMM minimum
July 27, 2016 at 9:23 am
Del Mar Fans & Lighting
Hi Ashraf, Each ceiling fan manufacturer has their own way of doing things. Contact one of the manufacturers to see about specifications. Be well.
July 27, 2016 at 9:37 am
Ashraf Hameed
Del Mar Fans & Lighting ok Sir but designing of a ceiling fan may have some standardization for angles
July 27, 2016 at 9:43 am
Alex Frankel
I have a 10.34 degree pitch and a 60" fan - what size downrod do I need?
August 7, 2016 at 6:55 pm
Del Mar Fans & Lighting
Hi Alex, That would also depend on the height of your ceiling. Take a look at our What Size Ceiling Fan Downrod Do I Need? article for more information.
August 8, 2016 at 10:31 am
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