Ideally, a freestanding coat rack should be at least 6-foot-tall to ensure that the coats don’t drag on the floor. The other dimensions then totally depend on the aesthetic of the coat rack and how it has been designed.
For example, if it has been designed with small spaces in mind, it might have fewer legs or a base instead of legs. If it’s not been designed with small spaces in mind, it might take up a larger surface area.
However, you also need to choose this size wisely. Ryan Fitzgerald, realtor and owner of Raleigh Realty, says, "It’s important that any coat rack is not too tall or heavy, in case of injury. You will need to check that the hooks of the coat rack are evenly spaced so that coats can be hung in a way where the weight of one coat will counteract the weight of the opposite one and not cause it to fall in the heavier direction."