Ratio Scale

This scale of measurement contains an absolute zero point; therefore, it makes it possible for you to not only quantify and compare the sizes of differences between values, but also to interpret both values in terms of absolute measures of quantity or amount (e.g., time; 3 hours is not only 2 hours more than 1 hour, but it is also 3 times more than 1 hour).

See also, Elementary Concepts.