To Buy or Not to Buy The decision whether to buy or rent a home may have long-term implications. Related Content Roth 401(k) vs. Traditional 401(k) This calculator compares employee contributions to a Roth 401(k) and a traditional 401(k). Interested in a Fuel Efficient Car? Estimate how many months it may take to recover the out-of-pocket costs when buying a more efficient vehicle. Estimating the Cost of College This worksheet can help you estimate the costs of a four-year college program.