The general rule that people use is the 4% rule. If you take your comfortable living amount and divide by 0.04, you will get a rough estimate on how much you wi

The general rule that people use is the 4% rule. If you take your comfortable living amount and divide by 0.04, you will get a rough estimate on how much you will need to retire. This is based off of market returns, primarily invested in index funds. If 40k / year was comfortable, then the target would be 1,000,000.