To figure out the right size diameter of a light fixture for your space

To figure out the right size diameter of a light fixture for your space, take the length and width of the room (in feet) and add them together. Take that total and swap the feet for inches (20 feet becomes 20 inches). That number will be the ideal diameter for your fixture.

Diameter

To determine the diameter of a light fixture that’s best for your space:

  1. Measure the length and width of the room in feet.
    Example: 10 feet by 12 feet
  2. Add the two lengths together.
    Example: 10 + 12 = 22 feet
  3. Swap that value in feet for inches (so 20 feet becomes 20 inches)
    Example: 22 feet > 22 inches
  4. This is the ideal diameter for a light fixture in this room.
    Example: 22 inches wide.

Height

To determine the height of a light fixture that’s best for your space:

  1. Start with the height of the room (floor to ceiling) in feet.
    Example: 10 feet high
  2. Multiply the height by 2.5″ to 3″ per foot.
    Example: 10 x 2.5″ to 3″ = 25-30 feet
  3. Swap that value to inches (so 20 feet becomes 20 inches).
    Example: 25-30 feet > 25-30 inches
  4. This is the ideal height for a light fixture in this room.

So for this room, you’ll want to look for a light fixture around 22 inches wide and 25-30 inches tall.