Contributing to an IRA? Determine if you are eligible to contribute to a traditional or Roth IRA. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Share | Related Content The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Value vs. Growth Investing Among stock-market investors there’s long been a debate between those who favor value and those who favor growth. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.