Question: how wide should a ceiling medallion be?
Answer: A room with a square footage from 140 to 210 square feet would need a medallion that's 20 to 30 inches wide. A room with a square footage from 210 to 280 square feet would need a medallion that's 30 to 40 inches wide. Any room larger than 280 square feet would need a medallion 40 inches wide.