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Investing calculators

See how money grows over time — and what it is really worth after inflation, fees and the difference between nominal and effective returns.

401(k) Growth Calculator Project your 401(k) balance including employer matching contributions APY vs APR Calculator Convert a nominal APR into the effective annual rate (APY) for any compounding frequency, and see what the difference is worth on a real balance CAGR Calculator Calculate compound annual growth rate from a starting value, ending value and number of years Compound Interest Calculator See what compound interest does to a starting balance plus regular monthly contributions Crypto Profit Calculator Work out the gain on a crypto trade from the amount invested, buy and sell prices and the exchange fee charged on each side Emergency Fund Calculator Work out the size of an emergency fund from your monthly essential spending and months of cover, the gap to your current savings, and how long it takes to close it Inflation Calculator See what inflation does to prices and to the value of your money over time Net Worth Calculator Work out your net worth from cash, investments, property and other assets minus every debt, and see how concentrated your balance sheet is ROI Calculator Calculate return on investment, net profit and the equivalent annualised return for any investment or project Retirement Nest Egg Calculator Project your retirement balance from current savings, monthly contributions, expected returns and years to retirement Retirement Withdrawal Calculator Work out how much you can withdraw from a retirement portfolio each year at a given withdrawal rate, and how the balance changes over a 30-year retirement Savings Goal Calculator Find out how many months it takes to reach a savings target from your current balance, monthly deposits and interest rate — and how much of it is interest Simple Interest Calculator Calculate simple interest on a principal amount at a fixed rate for a chosen number of years, including the total balance and the monthly interest equivalent Stock Profit Calculator Calculate the profit or loss on a stock trade from shares, buy price, sell price and commission, with the percentage return on cost

What you can calculate

Investment projections are all variations on compounding: a starting balance, a regular contribution and a rate of return. The calculators here let you vary each factor separately so you can see which one matters most for your goal.

Treat every projection as a scenario, not a forecast. Constant-return models hide the volatility of real markets; they are useful for planning ranges and for comparing two decisions, not for predicting an exact balance.

Frequently asked questions

Are these calculators free?

Yes. Every calculator on this site is free, needs no account and runs entirely in your browser.

How accurate are the results?

Each page states its assumptions and shows a worked example. The formulas are standard industry formulas, but real-world results depend on fees, taxes and individual circumstances.

Do you store what I type?

No. The calculation runs in your browser and nothing is submitted to a server.

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