To calculate one's "ecological footprint", a number of CO2 calculators can be found on the Internet. These can be used to illustrate the ecological impact of one's own lifestyle.
The German Federal Environment Agency (UBA) provides a powerful CO2 calculator that surveys a wide range of aspects of daily behavior and generates a personal CO2 footprint. With a quick test, an initial personal ecological balance can be calculated with just a few inputs. Results for the individual categories and comparative values with the German average illustrate the user's own "ecological footprint". In a scenario, the calculator also provides information on how one's own carbon footprint can be quickly improved through appropriate measures.
Another recommended calculator can be found on the website of the Global Footprint Network. Colorful animations give this calculator an additional graphical appeal and the questions also cover some kind of unusual lifestyles.