Investment Calculators
Free tools to plan your financial future. Whether you're calculating returns, setting goals, or doing quick percentage math — every calculator updates in real time.
Compound Interest
See how your money grows exponentially over time. Includes initial capital, monthly contributions, and a period-by-period breakdown.
DCA Calculator
Simulate Dollar-Cost Averaging with weekly, bi-weekly, or monthly contributions. Compares DCA vs lump sum so you can see the difference in final value.
ROI Calculator
Calculate total ROI and annualized CAGR for any investment or stock trade. Includes S&P 500 benchmark comparison and break-even recovery analysis.
First Million
Find out at what age you'll reach $1,000,000 — or how much you need to invest monthly to get there by your target date.
Simple Interest
Calculate returns on fixed-income investments where interest is applied only to the original principal — no compounding effect.
Percentage Calculator
Four calculation modes: find a percentage of a value, calculate proportions, measure gains, or measure losses instantly.
Why use financial calculators?
Understanding the math behind investing is one of the most important steps toward building wealth. Compound interest — often called the "eighth wonder of the world" — turns small, consistent contributions into life-changing sums over time. Our calculators make that math transparent and interactive.
Unlike generic calculators, these tools are built specifically for US investors: dollar amounts, annual rates aligned with US market conventions, and results designed to inform real portfolio decisions. Use them alongside our stock analysis pages and portfolio tracker to make more informed decisions.
Compound vs. Simple Interest
Simple interest grows linearly: you earn the same dollar amount every period based solely on the original principal. Compound interest snowballs: each period's interest is added to the principal, so future interest is calculated on a larger base. Over 20–30 years, the difference between the two is enormous — and that's exactly what the compound interest calculator visualizes.