Investing

Find the Right Investment Calculator

Whether you're just starting to save, planning early retirement, or managing a portfolio, this page points you to the right tool for your situation. Each section below covers a specific financial goal and the calculators that address it directly.

Retirement Planning

If you're saving through a 401(k) and want to understand how your contributions will grow over time, start with the 401k Calculator. It projects balance growth based on contribution rate, employer match, and assumed return — useful for checking whether you're on track for your target retirement age. To decide between a traditional pre-tax account and a Roth, run both scenarios in the Roth vs Traditional IRA Calculator: it compares after-tax outcomes based on your current vs. expected future tax bracket.

Once you're in retirement, the RMD Calculator computes your Required Minimum Distribution from traditional accounts each year (required starting at age 73 under current rules). If you want to factor in Social Security timing, the Social Security Break-Even Calculator estimates monthly benefit at different claiming ages, and the Social Security Breakeven Calculator shows when delaying starts to pay off vs. claiming early. For those 50 and older, the Catch-Up Contribution Calculator shows how extra annual contributions affect your projected balance.

Self-employed individuals have additional account options — the SEP-IRA Calculator shows your maximum contribution based on net self-employment income, and the SIMPLE IRA Calculator handles small business retirement math. High earners who are over the Roth IRA income limit can explore the Mega Backdoor Roth Calculator to see how much they can move into Roth through after-tax 401(k) contributions. HSA holders often underuse this triple-tax-advantaged account — the HSA Calculator shows projected long-term value when investments are left to grow. See all tools and guides in the Retirement Planning hub.

FIRE and Early Retirement

If your goal is financial independence before traditional retirement age, the FIRE Calculator estimates when you'll reach your target number based on savings rate, current assets, and the 4% withdrawal rule. For a variation that lets you stop aggressively saving early and let compound growth do the work, the Coast FIRE Calculator shows what balance you need today to coast to your target by a given age. To see how long until you hit $1M specifically, the Millionaire Calculator gives a straightforward timeline projection.

If you have a specific savings target in mind — a house down payment, a sabbatical fund, or a child's education — the Savings Goal Calculator shows monthly contribution required and timeline. The Emergency Fund Calculator helps you size a proper cash buffer (typically 3-6 months of expenses) before investing aggressively. The Compound Interest Calculator illustrates how a lump sum or regular contributions grow over time at different rates. For a quick mental model, the Rule of 72 Calculator tells you how many years to double your money at any given rate. To understand how inflation erodes purchasing power over time, use the Inflation Calculator. See all tools and guides in the FIRE & Savings Goals hub.

Debt Management

High-interest debt undermines any investing strategy — it's worth addressing first. The Debt Payoff Calculator compares snowball (smallest balance first) vs. avalanche (highest interest first) strategies and shows total interest paid under each approach. For credit card debt specifically, the Credit Card Payoff Calculator shows how long payoff takes at different monthly payment amounts and the total interest cost. For any type of installment loan, the Loan Calculator breaks down monthly payment, total interest, and amortization schedule.

Investment fees compound negatively just like returns compound positively — the Investment Fees Calculator shows how much a 0.5% vs. 1.5% expense ratio costs over 30 years (often hundreds of thousands of dollars). If you're comparing savings account rates and want to see how much more a high-yield account earns vs. a standard account, the HYSA Rate Comparison makes the math concrete. See all tools and guides in the Debt Management hub.

Stock and Portfolio Analysis

For options traders, the Options Profit Calculator estimates profit and loss at expiration across a range of underlying prices — useful for visualizing max gain, max loss, and breakeven before entering a trade. Dividend investors can project income and total return with the Dividend Calculator, which factors in reinvestment (DRIP) and dividend growth rates. The Sharpe Ratio Calculator helps evaluate whether a portfolio's returns justify its volatility relative to a risk-free rate.

If your asset allocation has drifted from your target due to market movements, the Portfolio Rebalance Calculator shows exactly how much to buy or sell in each holding to get back to target. Dollar-cost averaging over a volatile period is analyzed by the DCA Calculator, which shows how regular fixed purchases reduce average cost per share. The Tax-Loss Harvesting Calculator quantifies the tax savings from strategically selling losing positions to offset realized gains. See all tools and guides in the Stock & Portfolio Analysis hub.

Savings and Interest

For conservative savers interested in inflation-protected instruments, the I-Bond Calculator projects I-bond value based on current composite rates. The Treasury Bill Calculator shows annualized return from T-bills based on purchase price and face value. To understand yield dynamics across maturities, the Bond Yield Calculator computes current yield and yield-to-maturity for individual bonds.

To get a full picture of where you stand financially, the Net Worth Calculator totals your assets minus liabilities and tracks the number over time. The Net Worth Percentile tool puts your number in context against US age-group data. If you're curious how your spending compares to others at your income level, the Spending Percentile Calculator gives a data-based benchmark. See all tools and guides in the Savings & Interest hub.

For investors comparing global markets, foreign tax treaties, or non-US brokerage accounts, the International Investing hub groups tools and guides for cross-border investing decisions.