FREE ONLINE STOCKS CALCULATORS
Use simple stock market calculators to estimate investment returns, ROI, compound growth, and future portfolio values before you invest.
Measure Your Stock Returns Like a Professional
Stock market wealth is built on arithmetic as much as on stock picks. The free stock calculators above help you measure returns, compare investments on equal footing, and project how compounding grows a portfolio over time — the same math professional investors use every day.
Return on investment (ROI)
ROI tells you how efficiently your money worked, expressed as a percentage of what you put in:
ROI = (Final Value − Initial Cost) ÷ Initial Cost × 100
If you buy shares for $1,000 and sell for $1,300, your ROI is 30%. For the true figure, include dividends received and subtract brokerage fees and taxes. The ROI Calculator handles this in one step, while the Stock Calculator breaks down profit or loss on any single trade.
Compound annual growth rate (CAGR)
A stock that doubles in five years did not grow 20% per year — compounding makes the true annual rate lower. CAGR smooths a bumpy ride into one equivalent yearly rate:
CAGR = (Ending Value ÷ Beginning Value)1 ÷ Years − 1
Doubling in five years equals a CAGR of about 14.9%. Use CAGR, via the Investment or Compound Interest Calculator, to compare a volatile stock against a steady bond on equal footing.
Let compounding do the heavy lifting
Reinvested dividends buy more shares, which then pay more dividends — the snowball behind long-term equity returns. A portfolio compounding at 8% roughly doubles every nine years (the rule of 72: divide 72 by the rate to estimate years to double). The Future Value Calculator projects where regular contributions land decades into the future.
Mind the costs
Brokerage fees, fund expense ratios, and taxes all drag on the formulas above. A 1% annual fee can erase nearly a third of your gains over forty years. Run the numbers with the calculators first, then invest with confidence.
Stock Calculator FAQs
How do I calculate ROI on a stock?
Divide your total gain by your initial cost and multiply by 100: ROI = (Final Value − Initial Cost) ÷ Initial Cost × 100. Include dividends received and subtract fees and taxes for the true return. Try the ROI Calculator above.
What is CAGR and how is it different from average return?
CAGR is the single constant annual rate that would grow your investment from start to finish: (Ending ÷ Beginning)1 ÷ Years − 1. Unlike a simple average, it accounts for compounding, making it the fair way to compare investments over different periods.
Do dividends count toward my stock returns?
Yes. Your total return equals price appreciation plus dividends received. A stock that rises 6% and pays a 2% dividend delivered an 8% total return before costs. Always compare total returns, not price changes alone.