Investment Return Calculator
Calculate the future value of your investment with regular contributions and an expected return rate. Plan your retirement or savings goals with ease.
How Investment Returns Work
Investing is one of the most powerful ways to build wealth over time. The future value of an investment depends on three key factors: the amount you invest, the return you earn, and the time you stay invested.
Compound Interest — The Eighth Wonder
Compound interest is the interest earned on both your initial principal and the accumulated interest from previous periods. This "interest on interest" effect causes your money to grow exponentially over time. The longer your investment horizon, the more powerful the compounding effect becomes.
Regular Contributions Supercharge Growth
Adding regular contributions — whether monthly or annually — dramatically accelerates your investment growth. Even small amounts added consistently can grow into substantial sums over decades. This is the strategy behind dollar-cost averaging and systematic investment plans.
Historical Returns & Expectations
The S&P 500 has delivered an average annual return of about 10% over the past century (before inflation). However, past performance doesn't guarantee future results. Conservative long-term projections often use 6-8% for stock-heavy portfolios, while bonds and other fixed-income investments typically offer lower returns.
The Rule of 72
The Rule of 72 is a quick way to estimate how long it takes for an investment to double. Simply divide 72 by your annual return rate. For example, at an 8% return, your money doubles in about 9 years (72 ÷ 8 = 9). This rule highlights the power of even modest returns over long periods.
Frequently Asked Questions
Future value is the value of an investment at a specific date in the future, taking into account the initial principal, regular contributions, and the expected rate of return over time. It represents the total amount you'll have after your investment grows and compounds.
Regular contributions (like monthly or annual deposits) significantly boost investment growth through the power of compound interest. Even small, consistent contributions can grow substantially over long periods. For example, investing $500/month for 30 years at 8% return can grow to over $700,000.
Compound interest is the interest earned on both the initial principal and the accumulated interest from previous periods. It allows your investment to grow exponentially over time. Albert Einstein reportedly called it "the eighth wonder of the world."
Historical average annual returns for the S&P 500 are around 10% before inflation. However, expected returns vary based on the type of investment. Conservative estimates often use 6-8% for long-term stock market investments, while bonds typically offer lower returns in the 3-5% range.
Enter your initial investment amount, regular contribution amount, contribution frequency (monthly or annual), expected annual return rate, and number of years. The calculator will show you the future value, total contributions, and total interest earned. You can also view a year-by-year breakdown of your investment growth.
The Rule of 72 is a quick mental math shortcut to estimate how long it takes for an investment to double at a given annual return rate. Divide 72 by the annual return percentage. For example, at 8% return, your money doubles in about 9 years (72 ÷ 8 = 9). At 6%, it takes about 12 years.