How to Calculate Your Ceiling Slope for a Ceiling Fan

For today's blog, we're heading back to pre-algebra. But don't click away just yet! Calculating the slope for your ceiling fan is easy as 1-2-3. If you're wondering if you have a sloped ceiling, the answer is simple. If your ceiling has any angle, it's sloped. If it's a flat ceiling, then you don't have to worry about it!

The reason you need to know if you have a sloped ceiling before ordering a ceiling fan is that not every fan is compatible with a sloped ceiling. Ceiling fans, if installed on a sloped ceiling, will wobble and shake and become a safety hazard if not installed properly. Not to mention, poor airflow and performance due to bad installation conditions. 

Types of Sloped Ceilings

There are several types of pitched ceilings, such as low-slope and steep vaulted ceilings. In today's atmosphere, many ceiling fans are slope compatible up to a certain degree. The reason for manufacture slope-degree specification is so that the ceiling fan can be installed properly. Otherwise, a sloped ceiling kit may need to be purchased in addition. 

Let's talk about how to find the slope of your ceiling. Remember rise over run from the pre-algebra days? Well, it's back, and very useful. Here are the tools and steps you will need to 

Tools Needed to Calculate Ceiling Slope: 

• Tape measure
• Level (or straight edge) - iPhones have a level capability
• Pencil & paper or phone calculator
• Optional: angle finder or slope app - Protractor+ is a great one!

How to Measure Ceiling Slope (Step-by-Step)

1. Measure the Run. Place a level horizontally 
2. Measure the Rise. Measure vertically from the end of the level to the ceiling
3. Calculate the Slope. Slope = Rise ÷ Run. 
4. Convert Slope to Angle. Use the slope percentage calculator to do this. 

Example: 6" rise over 12" run = 6:12 pitch. Enter 6" rise and 12" run into the calculator. You get a 26° angle for your slope.

How to Tell if Your Ceiling Fan is Sloped Ceiling Compatible

Most ceiling fans will list in their specifications or details whether they are compatible with a sloped ceiling or not. The average slope degree that fans can handle is up to 30°. For example, the Maverick Smart 52" Ceiling Fan by Visual Comfort lists that the "product may be mounted on a sloped ceiling." 

Do I Need a Sloped Ceiling Adapter for My Ceiling Fan?

Do I Need a Special Downrod for My Ceiling Fan on a Sloped Ceiling?

Most ceiling fans come with short downrods, such as 3" or 6". This isn't a problem for most bedrooms, but it can be a problem with tall ceilings or vaulted ceilings. When selecting a fan downrod for your sloped ceiling, consider fan blade clearance. Since the ceiling comes up at an angle, certain parts will be lower than where the fan is hanging from. Clearance simply refers to the fan blades having enough space to rotate without running into the ceiling. 

Downrod Length by Slope Guide

Shop fan downrods here. 

Click and hold the picture below to save it as a guide!