Take the time to add up your total monthly income from all sources and list your regular monthly expenses to create a monthly budget. Categorize expenses in groups to make the process simpler. For example, include mortgage payments or rent as well as utilities when you list an amount for housing. Transportation includes not just your car payments but gas, insurance, registration and repairs as well. Quicken’s Free Budget Calculator gives you a boost toward getting this done by doing all the math for you.