What's the fastest way to double my savings?

The fastest legitimate way to double your savings depends on your timeline and risk tolerance. Investing in a diversified stock market index fund has historically doubled money roughly every 7-10 years following the Rule of 72 (divide 72 by your expected return rate to estimate doubling time). For faster results, higher-risk options like individual growth stocks or real estate can work but carry significant downside risk. More immediately impactful: eliminate high-interest debt first, maximize any employer 401k match (that's an instant 50-100% return), and move savings into a high-yield savings account earning 4-5% APY. Combining reduced expenses with increased income through a side job accelerates the process more than any single investment strategy.