calculator html 5

I am doing a art project that needs to have a allow a person to use a calculator calualte their addictions. EX: a person would go to [login to view URL] and on a page on the site they can log in and use a drop down to click an addiction IE "pot" and add amount they spend in dollars and days a week or by month and then it would add that additction to THEIR JAR AND PUT ON A VIRTUAL SHELF Bascially a user goes to site log in to creat their own jar with all of their addictions calculated . they can ad or adjust and then when they save THEIR JAR is put into the world shelf [login to view URL] would be great to have someon who wanted credit foer this project as it will be on going and is an art project / social experiment.