Creating a good budget can be a difficult and confusing task, and a budget calculator will help you create a budget that fits your personal financial situation, needs, and goals. There are numerous budget calculators available online. You simply input your financial information such as income and expenditures. Regular expenditures are things that do not change from month to month, like mortgage or car payments. Other expenditures you may want to budget for might include things like eating out, clothing, or entertainment. Using a budget calculator can help you see how much you can afford so that you can create a realisitic budget.