Investment Calculators
Investment and retirement calculators to project growth, compound returns, and long-term portfolio outcomes. This category includes 2 free tools.
Compound Interest Calculator
Calculate compound interest on your savings or investments. See how your money grows over time with our free calculator.
InvestmentRetirement Calculator
Project your retirement savings with compound growth. See yearly breakdown of contributions and investment returns.
InvestmentAbout Investment Calculators
The difference between a modest nest egg and a life-changing one often comes down to time, consistency, and the power of compound returns. Our investment calculators help you model different scenarios — what happens if you contribute $500 more per month, or retire five years earlier, or earn 7% vs. 9% average returns — so you can make decisions grounded in math rather than guesswork.
The compound interest calculator uses the standard compound growth formula: A = P(1 + r/n)^(nt), where compounding frequency (daily, monthly, annually) makes a material difference over decades. The retirement calculator models accumulation through your working years and then projects how long your portfolio will last in drawdown, using the 4% safe withdrawal rate as a reference point.
All projections are estimates. Actual investment returns vary based on asset allocation, fees, market conditions, and rebalancing discipline. Past returns do not guarantee future performance. Use these tools for planning direction, not precise predictions, and revisit your projections regularly.
Frequently Asked Questions
What is compound interest and why is it so powerful?
Compound interest means you earn returns not just on your original principal but also on the interest already accumulated. This creates exponential growth over time. A $10,000 investment earning 7% annually doubles roughly every 10 years — becoming $20,000, then $40,000, then $80,000, without any additional contributions.
What is the Rule of 72?
The Rule of 72 is a quick mental math shortcut: divide 72 by your expected annual return to estimate how many years it takes to double your money. At 6% returns, your money doubles in about 12 years (72 ÷ 6 = 12). At 9%, it doubles in 8 years. It's a useful way to intuitively grasp the impact of different return rates.
How much should I save for retirement?
A common benchmark is to save 15% of your gross income for retirement, including any employer match. The final number depends on your target retirement age, expected lifestyle, Social Security income, and withdrawal rate. Use the retirement calculator to model your specific scenario based on current savings, contributions, and timeline.
How does compounding frequency affect returns?
More frequent compounding produces slightly higher effective returns. For example, $10,000 at 10% annually compounded once yields $11,000 after one year. The same at 10% compounded monthly yields $11,047.13 — a small difference that becomes significant over decades.