SP500Calc is a free suite of investment tools designed to help everyday investors visualize the power of compounding, index fund investing, and long-term wealth building.
SP500Calc was built with one goal: to make financial projections simple, transparent, and accessible to everyone — without sign-ups, paywalls, or complicated software.
We believe that understanding the math behind investing — compound interest, dividend reinvestment, the true cost of fees, and the impact of inflation — is one of the most valuable things a person can learn. Our calculators are designed to make that math visual, intuitive, and instantly useful.
All calculators are completely free to use. No account required. No data collected. Just plug in your numbers and see the results.
Estimate how your investment could grow over time using the S&P 500's historical returns, with monthly contributions and compound interest.
Project your retirement savings based on your current age, contributions, and expected returns. Includes monthly income estimate using the 4% rule.
See the difference between reinvesting dividends vs. taking them as cash — and how DRIP accelerates portfolio growth over time.
Understand how inflation erodes purchasing power over time, and how investing can help you stay ahead of rising prices.
See the true long-term cost of expense ratios and how even small fee differences can cost you hundreds of thousands of dollars over decades.
All calculators use standard financial formulas with monthly compounding, which is the most common compounding period for investment accounts. Results are projections based on the inputs you provide and historical averages — they are not guarantees of future performance.
SP500Calc is an independent educational resource and is not affiliated with any brokerage, financial institution, or investment product. We do not provide personalized financial advice. Always consult a qualified financial advisor before making investment decisions.
We'd love to hear from you. Reach out via our contact page.
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