Key Takeaways Financial experts say you'll need about 70% to 80% of your pre-retirement income to maintain your lifestyle in retirement. For the median U.S. household income ($83,730), you'd need about $5,233 per month in retirement. Using the 4% rule, that means that you'd need to save $1.57 million in total. When preparing for retirement, you're probably wondering, will I have enough? To answer this, you'll need to know a few key numbers. First, how much money will you need per month in retire ...