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Compound Interest Calculator
Calculate the future value of your investments with compound interest.
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Kelly Criterion Calculator
Optimize your bet sizing using the Kelly formula for maximum growth.
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Stock Average Cost Calculator
Calculate your average cost basis when buying stocks at different prices.
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Loan Calculator
Calculate monthly payments and total interest for your loans.
Calculate →What is Compound Interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. It's often called "interest on interest" and can significantly grow your wealth over time through the power of exponential growth.
What is Kelly Criterion?
The Kelly Criterion is a mathematical formula developed by John L. Kelly Jr. in 1956 to determine the optimal size of bets to maximize long-term wealth growth while minimizing the risk of ruin.
What is Stock Average Cost?
Stock average cost (or cost basis) is the average price you paid per share across multiple purchases. It's essential for calculating profits/losses and tax reporting when you sell your investments.
What is Loan Amortization?
Loan amortization is the process of paying off debt through regular payments over time. Each payment covers both principal and interest, with early payments being mostly interest and later payments mostly principal.
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Frequently Asked Questions
How accurate are these calculators?
Our calculators use standard financial formulas used by banks worldwide. Results are accurate to the cent.
Is my financial data safe?
Yes. All calculations happen in your browser. We never collect or store your data.
Can I use these for professional purposes?
Yes, but verify important calculations with a licensed financial advisor.