There is no set rule on how high a shelf should be hung over a toilet. A good rule of thumb is, high enough that no one will hit their head.
There are many factors that need to be considered to answer this question. Insufficient data not provided. What is the type of towel that will be hung from this towel bar? Guest towel, hand towel or bath towel? For most guest or hand towels you want to divide the length of the towel by 2, add 3 or 4 inches so the towel doesn't contact the toilet tank top. Also consider that gravity factors into it as well. Ideally, the towel should not hang any higher than the shoulder of the average person using the towel after washing their hands. This is to keep the water on the hands from dripping down the sleeve of the person using the towel. Then consider the aesthetics of having a decorative item (Guest soap basket or a small floral dish or basket) on top of the toilet tank. Also consider hanging a small picture above the towel bar to balance the effect. There is no direct way to answer the question, just a few hints to consider what will be functional, easy to use and add to the overall design of the bathroom.
The standard height for a bathroom towel bar is typically around 48 inches above the floor.
The ideal height for a towel bar in a bathroom is typically around 48 inches above the floor.
The standard height for a towel bar in a bathroom is typically around 48 inches above the floor.
The recommended height for a towel bar in a bathroom is typically around 48 inches above the floor.
The typical towel bar height for installation in a bathroom is around 48 inches above the floor.
The recommended height for installing a shower towel bar is typically around 48 inches above the floor.
A towel bar in a bathroom should typically be installed at a height of 48 to 52 inches above the floor.
The recommended height for installing a towel bar in a bathroom is typically around 48 inches above the floor.
The standard towel bar height typically used in bathrooms is around 48 inches above the floor.
The standard height for a towel bar in a bathroom is typically around 48 inches above the floor. However, towel bars are often installed at a height that is convenient for the user, which can vary depending on personal preference and the design of the bathroom.
The recommended towel bar height for optimal functionality and aesthetics in a bathroom is typically around 48 to 52 inches above the floor.