No one wants to have to wait when needing to make use of the bathroom facilities. Whether the intended use is showering, brushing ones teeth, or, um, anything else, it is as the old saying goes – when you gotta go, you gotta go.

After spending time analyzing some data from the United States Census, I have uncovered an interesting trend related to average household size and average number of bathrooms in new single-family houses completed in the United States.

Way back in 1973, the average household size was 3.01 persons and the Average number of bathrooms per house was 1.89. This equals 1.59 persons per bathroom in the United States. Fast forward 40 years to 2013 and the bathroom is much more accessible. The number of persons per bathroom has dropped to just 1.03. If the trend continues, when the numbers come out for 2014 we will most likely see a value of 1.0 or even less.

The reason for this trend is simply that the average household size in the United States has been steadily decreasing and the average number of bathrooms per house in the United States has been steadily increasing.

### Interactive Chart of Average Number of Persons per Bathroom in the United States:

Data Source: United States Census.

My Excel Data File.

#### Methodology for computing the average number of bathrooms per house:

The census data does not include the average number of bathrooms per house figure. I devised a formula to calculate the average using the data. If you take a look at the excel file, you will see that the census data has, for each year:

- Total number of houses.
- Number of houses with 1.5 bathrooms or less.
- Number of houses with 2 bathrooms.
- Number of houses with 2.5 bathrooms.
- Number of houses with 3 or more bathrooms.

To calculate the average, I simply multiplied 1.5 times the number of houses with 1.5 bathrooms or less. Then, I multiplied 2 times the number of houses with 2 bathrooms, etc. After that, I totaled the number of bathrooms together and divided by the total number of houses.

Source: Bathroom City.