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Investment & Retirement

Compound interest, required minimum distributions, Roth conversions, 401(k) planning — maximize every dollar you invest.

Every calculator below is free, runs in your browser, and is updated with 2026 tax rates and limits. No signup, no email — just your answer in seconds.

Compound interest calculator with monthly contributions for investment growth

Compound Interest Calculator

See how your money grows over time. This calculator shows the power of compound interest with monthly contributions, different compounding frequencies, and inflation adjustment.

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Required minimum distribution calculator with 2026 IRS RMD tables

Required Minimum Distribution Calculator

Turning 73? The IRS requires you to start withdrawing from retirement accounts. This calculator shows your exact RMD amount — and the penalties for getting it wrong.

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Roth conversion calculator showing whether converting to a Roth IRA is worth it

Roth Conversion Calculator

Should you convert your traditional IRA to a Roth? This calculator shows the tax cost of converting — and whether the long-term tax-free growth makes it worth it.

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401k calculator showing how much your 401k will be worth at retirement

401(k) Calculator

How much will your 401(k) be worth at retirement? This calculator shows growth with employer matching, contribution limits, and the real impact of starting early vs. late.

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Investment return calculator showing how much your investments will grow

Investment Return Calculator

How much will your investments grow? This calculator shows compound growth with monthly contributions, comparing different return rates and time horizons.

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Stock portfolio return calculator showing how your portfolio is performing

Stock Portfolio Return Calculator

How is your stock portfolio performing? This calculator factors in contributions, dividends, capital gains, and taxes to show your real after-tax return.

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ETF fee calculator showing how expense ratios reduce returns over time

ETF Fee Calculator

How much do ETF fees actually cost you over time? This calculator shows the drag of expense ratios and trading fees on your long-term returns — even small differences add up.

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Retirement savings gap calculator showing if you are on track for retirement

Retirement Savings Gap Calculator

Are you on track for retirement? This calculator shows the gap between what you'll have and what you need — and exactly how much extra to save each month to close it.

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Inflation calculator showing what money will be worth in the future

Inflation Adjusted Calculator

What will your money be worth in the future? This calculator shows the impact of inflation on savings, investments, and income — so you can plan for real purchasing power.

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Emergency fund calculator showing how much you should save for emergencies

Emergency Fund Calculator

How much should you have in your emergency fund? This calculator shows your ideal target based on expenses, income stability, and risk tolerance — plus how long to build it.

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CD calculator showing certificate of deposit interest earnings and maturity value

CD Calculator

Estimate how much a certificate of deposit will earn with compound interest. See your maturity value, interest earned, and effective APY.

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Roth IRA growth calculator showing tax free retirement savings

Roth IRA Calculator

Project how much your Roth IRA grows with tax-free compounding. See contributions, tax-free earnings, and the pre-tax balance you'd need to match it.

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Retirement withdrawal calculator using the 4 percent rule to see how long savings last

Retirement Withdrawal Calculator

Use the 4% rule to estimate safe annual withdrawals, and see how long your savings will actually last under your withdrawal rate and returns.

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529 college savings calculator showing projected savings against future college costs

529 College Savings Calculator

Project your 529 plan growth and how much of future college costs it will cover. See the monthly savings needed to close the gap.

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Frequently Asked Questions

How does compound interest work?+

Compound interest earns returns on your original investment PLUS previous returns. Example: $10,000 at 7% compounded annually becomes $10,700 after year 1, then $11,449 after year 2 (interest on $10,700). Over 30 years, $10,000 grows to $76,123 without adding a penny.

How much will $10,000 grow in 10 years?+

At 7% annual return (stock market average): $19,672. At 4% (savings account): $14,802. At 10% (aggressive investing): $25,937. Adding $500/month: $10k + contributions = $103,000+ at 7%. The monthly contributions matter more than the initial amount.

When do I need to start taking RMDs?+

Under SECURE 2.0, RMDs begin at age 73 (for those born 1951-1959) or age 75 (born 1960+). Your first RMD must be taken by April 1 of the year after you turn 73/75. After that, all RMDs must be taken by December 31 each year.

How is my RMD calculated?+

RMD = Account balance ÷ Distribution period (from IRS Table III). Example: $500,000 account at age 73 → distribution period is 26.5 → RMD = $18,868. The divisor decreases each year, so RMDs increase as you age.

How much tax do I pay on a Roth conversion?+

The converted amount is added to your taxable income for the year. Example: converting $50,000 while in the 22% bracket = $11,000 in additional federal tax. If it pushes you into the 32% bracket, part is taxed at 32%. Plan conversions to stay within a target bracket.

When does a Roth conversion make sense?+

Best when: (1) You're in a lower tax bracket now than you expect in retirement. (2) You have years with low income (job loss, sabbatical, early retirement). (3) You want to avoid RMDs. (4) You want tax-free inheritance for heirs. The break-even point is typically 7-10 years.

Why Use Investment & Retirement?

Compound interest, required minimum distributions, Roth conversions, 401(k) planning — maximize every dollar you invest. Every calculator is free, runs in your browser, and stores no data. Get instant, actionable results with detailed breakdowns and explanations.

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