Investing calculators that just give you the answer.
No signup. No spam. No fake rates. Just the math — clear and simple or full pro mode. You choose.
Free investing calculators, built to just answer the question
SimplyInvest is a free set of investing and personal-finance calculators paired with plain-English explanations. Every tool runs entirely in your browser, gives you a clear number, and explains what that number means — no account, no email, and nothing to install. Switch any tool between Noob mode for a simple answer and Pro mode for the full detail.
It is built for people who want a straight answer to a money question without a sales pitch — whether you are running your first compound-interest projection, checking if you are on track for retirement, comparing a Roth against a Traditional IRA, or seeing what inflation has done to your savings. These are educational tools, not financial advice; see our Disclaimer for the full detail.
Grow & Invest
Compound Interest Calculator
See how your money grows like a snowball over timeModel compound growth with variable contribution frequency
Open Calculator →Retirement Calculator
Find out if you're saving enough to retire comfortablyProject retirement balance with drawdown and Social Security
Open Calculator →Coast FIRE Calculator
See how much you need invested today to stop saving and still retire on timeCompute your inflation-adjusted Coast FIRE number against your retirement target
Open Calculator →DCA Simulator
See why investing a little each month beats waitingCompare dollar-cost averaging vs lump sum with CAGR analysis
Open Calculator →Dividend Yield Calculator
Calculate how much passive income your shares could payModel DRIP compounding with dividend growth rate projection
Open Calculator →Roth vs Traditional IRA
See which IRA leaves you more after taxesAfter-tax Roth vs Traditional value on an equal out-of-pocket basis
Compare IRAs →Save & Bank
High-Yield Savings
See what your savings earn at a real APYProject HYSA growth and the gap vs a typical low-rate account
Open Calculator →CD & CD Ladder
See what a CD earns at maturityCD maturity value plus a CD-ladder builder for staggered terms
Open Calculator →Plan & Assess
Net Worth Percentile
See how your net worth ranks for your ageNet worth percentile by age, from 2022 Federal Reserve (SCF) data
Find Your Percentile →Inflation Calculator
See what your money is actually worth after inflationAnalyze real vs nominal returns with CPI-adjusted purchasing power
Open Calculator →Risk Tolerance Quiz
Find out what kind of investor you are in 2 minutesAssess risk profile and get asset allocation recommendations
Take the Quiz →How we build and source these tools
Each calculator is built on a standard, documented financial formula and shows its assumptions on the page, so you can see exactly how it reaches a result and change the inputs to fit your own situation. Because the math runs in your browser, the figures you enter are never sent to us or stored.
The data we cite — contribution limits, inflation, interest rates, market history — is traced to named primary sources such as the Federal Reserve, the Bureau of Labor Statistics, the IRS, and the U.S. Treasury, and checked before we publish. You can read exactly how we research, verify, and correct our work on the Editorial Standards & Methodology page.
Latest Insights
Plain-English financial impact analysis — how inflation, rates, markets, and retirement headlines affect your money.
Musk Pledged Your Kid One SpaceX Share Worth $146. What Will It Be Worth at 18?
Musk pledged every US child a $146 SpaceX share. See what it may be worth at 18, why it is locked up, and test it in the Compound Interest Calculator.
October I Bonds Lock In a 0.90% Fixed Rate for 30 Years. Should You Wait Until November?
September CPI set the next I bond rate at 4.08%. See why October buyers lock in a lower fixed rate, then compare in the High-Yield Savings…
Read insight → RetirementSocial Security’s 3.6% Raise Is $50 at 62 and $89 at 70. Which Check Will Be Yours?
The 2027 Social Security COLA is 3.6%, but your claiming age decides how many dollars it adds. Compare ages in the Retirement Calculator.
Read insight → Market CommentaryThe S&P 500 Just Flashed a Warning Not Seen Since 1929. Does Your Portfolio Depend on Just 7 Stocks?
Market breadth hit its worst reading since 1929 as the S&P 500 neared a record. Check your real exposure with the Risk Tolerance Quiz.
Read insight →How it works
Pick a tool
Choose from 6 free calculators built for real investors — beginners and pros alike.
Enter your numbers
Sliders and inputs make it instant. No forms to fill out, no accounts to create.
Results update live
Every change triggers an instant recalculation. No button needed. Just answers.