Sort the data in ascending order
Find the minimum value
Find the first quartile
Find the median
Find the third quartile
Find the maximum value
Draw a number line
Mark the minimum, first quartile, median, third quartile, and maximum on the number line
Draw a box from the first quartile to the third quartile
Draw a line inside the box at the median
Draw whiskers from the box to the minimum and maximum values
Check for outliers if needed
Label the box plot if required