Investment Return Calculator

Understanding Investment Returns

Investment returns compound over time, meaning your gains generate their own gains. This calculator helps you visualize how different return rates, contribution amounts, and time horizons create dramatically different outcomes. The difference between 7% and 10% annual returns might seem small, but over 20–30 years, it can mean hundreds of thousands of dollars.

Historical Average Returns

The S&P 500 has historically returned about 10% annually (roughly 7% after inflation). Bonds typically return 4–6%, and high-yield savings accounts currently offer 4–5% APY. Real estate has averaged around 8–12% including rental income and appreciation, though with significantly more work and risk than passive index investing.

The Impact of Fees

Fees matter enormously over long time periods. A 1% annual fee might not sound like much, but on a $500,000 portfolio over 25 years, it can cost you over $200,000 in lost growth. Index funds with expense ratios of 0.03–0.10% dramatically outperform high-fee mutual funds (1–2% expense ratios) over the long term. Always factor in fees when comparing investments.

Dollar-Cost Averaging vs. Lump Sum

Studies show that lump-sum investing beats dollar-cost averaging about two-thirds of the time, because markets trend upward over time. However, DCA (investing a fixed amount regularly) reduces the emotional risk of investing a large sum right before a downturn. Both strategies significantly outperform keeping cash on the sidelines.