What length bathroom runner should I buy?

The most common lengths in this category are 47–55 inches for standard vanities and 59–72 inches for double vanities or galley-style bathrooms. Across the reviewers we read, the recurring advice is to measure the open floor space and subtract a few inches so the runner doesn't bunch under the bathroom door — a complaint that comes up repeatedly in r/BuyItForLife threads about thicker chenille and memory-foam runners.