Stock market tools & calculators
61+ free tools, grouped by the question you actually have — not by what we called the code. Filing-backed analyzers and pure-math calculators; no login, no daily caps, and every tool hands off to the next.
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61 tools · search or filter by categoryFree forever. Every tool hands off to the next — your analysis follows you.
Monte Carlo SimulatorRun thousands of randomized market paths from your own return and volatility assumptions to see the realistic range of outcomes — not one misleading "average" projection.portfolioRetirement Withdrawal CalculatorTest any withdrawal rate against thousands of simulated retirements, or solve for the highest rate that still clears your target success bar — the real "will my money last" question, done honestly.portfolioFinancial Goal CalculatorWork out how much to save each month to hit a savings goal at your chosen confidence level — or test whether what you're already saving is actually enough, run against thousands of simulated market paths.portfolioRisk Tolerance QuizAnswer five quick questions about your time horizon, reaction to a drop, and goals to find a typical stock/bond/cash allocation range for your investor profile.riskStock Correlation MatrixSee how closely a set of stocks actually move together. Enter up to eight tickers for a correlation heatmap and a diversification score — because "is NVDA just AMD?" has a real answer.portfolioCORE TOOLPosition Size CalculatorTurns capital, risk %, entry, and stop into an exact whole-share position size with dollar risk and R-multiple targets.riskCORE TOOLOptions Profit CalculatorCalculate max profit, max loss, breakeven, and payoff at expiry for common option trades.optionsCORE TOOLDCF CalculatorEstimate intrinsic value per share using discounted future free cash flow.valuationKelly Criterion CalculatorEstimate full and fractional Kelly bet size from win rate and payoff ratio.riskMax Loss CalculatorSet your account-level line in the sand — the loss at which you stop trading — and share it with a friend to hold yourself accountable.psychologyRisk of Ruin CalculatorProbability your account ever hits a ruin-level drawdown, from win rate, payoff ratio, and risk % per trade.riskRisk/Reward Ratio CalculatorTurn entry, stop, and target into your R:R ratio, risk/reward per share, and the win rate needed to break even.riskStock Profit CalculatorComputes gross/net profit, percent return, and annualized return on a completed or hypothetical stock trade.portfolioAverage Cost CalculatorCombine up to 5 existing lots with a new buy to get your new average cost, total shares, total invested, and break-even.portfolioCompound Interest CalculatorProject how a starting balance plus monthly contributions compounds into a future value, year by year.portfolioDRIP CalculatorProject dividend reinvestment: end shares, end value, and annual income — reinvested vs. not, side by side.dividendsCAGR CalculatorTurn a beginning value, ending value, and time span into an annualized growth rate, total return %, and growth multiple.valuationPercentage Gain CalculatorTurn two prices into % gain/loss and dollar change — plus the exact gain needed to recover a loss.portfolioStock Break-Even CalculatorFinds the exact sell price where a stock trade breaks even after buy/sell fees, plus the % move needed to get there.riskCovered Call & Cash-Secured Put CalculatorPremium-seller returns: if-flat and if-called yields, annualized, breakeven, collateral, and effective buy price.optionsStock Split CalculatorSee your share count and price after any N-for-M split — forward or reverse — and why position value doesn't change.fundamentalsCapital Gains Tax CalculatorEstimate US federal capital gains tax on a stock sale — short vs long term, 0/15/20% brackets, NIIT, and effective ratetaxWACC CalculatorBlend equity and debt costs into one weighted average cost of capital — the discount rate a DCF wants.valuationGraham Number CalculatorA fair-value ceiling from earnings and book value — √(22.5 × EPS × BVPS), Benjamin Graham style.valuationSharpe Ratio CalculatorGrade return per unit of risk — Sharpe from return, risk-free rate, and volatility, plus Sortino when you have downside deviation.riskP&L Card GeneratorTurn any trading day's gain or loss into a clean, shareable card image — styled for X, Discord, or a screenshot.utilityFake Tweet GeneratorMock up a realistic X (Twitter) post image — for memes, mockups, and reaction screenshots.utilityCrypto DCA CalculatorDollar-cost-average a coin: see total invested, units accumulated, average cost, and value at any target price.portfolioCrypto Profit CalculatorEnter buy price, sell price, and amount — get your exact profit, return %, and the bite fees take.portfolioPortfolio BriefUpload a CSV of your holdings and see your real sector mix vs the S&P, concentration, and what is happening across your positions — parsed in your browser, nothing stored.valuationSmall-Cap DashboardOne ticker → dilution, float, halts, RVOL, levels, news in one view.small-cap forensicsDilution ProfileThe whole dilution picture on one screen: O/S history, warrants, convertibles, runway, offerings — five rated signals, formulas shown.small-cap forensicsS-3 Shelf CheckerIs an active shelf letting them dilute at any time?small-cap forensicsOffering CheckerWhen did they last announce — or execute — an offering?small-cap forensicsFloat CheckerShares actually tradable — the fuel behind small-cap moves.small-cap forensicsDo They Need Money?Cash runway from the latest filings — the motive for a raise.small-cap forensicsRed Flags + Health ScoreAccounting and liquidity warning signs, scored from filings.small-cap forensicsShort Squeeze Research HubEvery short surface in one place, incl. the full Reg SHO threshold list.small-cap forensicsShort Interest by TickerShares short, days to cover, % of shares outstanding — dated.small-cap forensicsShort Squeeze ScreenerDays to cover, builds & unwinds — FINRA biweekly data.small-cap forensicsRelative Volume (RVOL)Unusually active vs its own normal? Spot what's in play.small-cap forensicsTrading Halt MonitorLive Nasdaq/NYSE/Cboe halts, market-wide.small-cap forensicsSupport & ResistanceKey levels from daily→yearly pivots + 52-week hi/lo.small-cap forensicsSMA 200 FinderThe 200-day line big money watches — above or below, by how much.small-cap forensicsLarge-Cap DashboardQuality / Value / Momentum / Smart-Money over the whole long-term case — from filings + end-of-day prices.valuationCustom Research ReportTick the modules you want for one ticker — one shareable, printable page.valuationCompare StocksTwo tickers side by side on the fundamentals.valuationPlain-English ScreenerDescribe the stocks you want; we filter on the facts.valuationMax PainWhere open interest pins the tape — strike walls, expected move, daily snapshots and an accuracy ledger that grades itself.optionsInsider Trading TrackerEvery Form 4 buy and sell, filed by the officers and directors themselves.ownershipCongress Trading TrackerWho in Congress traded what, from STOCK Act disclosures.ownership13F Whale TrackerWhich funds added or trimmed — quarterly 13F holdings.ownershipGuru PortfoliosThe famous investors' disclosed books, position by position.ownershipEarnings CalendarWho reports, when — filing-confirmed, ranked by size and typical move.eventsOffering CalendarEvery offering priced in the past month, market-wide, day by day.eventsIPO TrackerWho's going public, and how the recent ones actually traded.eventsWhy Is It Moving?The likely catalyst behind a stock's move today.eventsStock NewsLatest headlines + SEC filings for any ticker.eventsDividend TrackerFiling-derived history, yield, growth, labeled projections.long-termTrading Journal + P&L CalendarLog trades or just the day's +/- P&L — green days, rose days, R-multiples, streaks. In your browser, no account.journalRisk PlaybookYour written rules, kept where you'll re-read them.journal
Don’t want to pick tools? Build one report.6 presets
Enter a ticker, tick the modules you want — float, short interest, dilution, runway, offerings, halts, headlines and more — and get them on one shareable page. Or start from a preset:
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Check a small cap for trapsDilution, float, halts and the paper trail, straight from EDGAR.14 toolsWork out what it is worthFiling-backed valuation with the formulas shown, not hidden.10 toolsSize the positionRisk per trade, stops and R-multiples before conviction.8 toolsRead the options chainOpen-interest structure and premium math, delayed and labelled.3 toolsSee who is buyingInsiders, Congress and funds, from the disclosures they must file.4 toolsFind the next eventFiling-confirmed dates, and what moved when it happened before.5 toolsPlan for the long runDividends, drawdowns and decades, with projections labelled.13 toolsReview my own tradingThe journal and its P&L calendar. Local-first, no signup.4 tools
Recommended tools
Good places to start.
CORE TOOLSmall-Cap DashboardOne ticker → dilution, float, halts, RVOL, levels, news in one view.CORE TOOLLarge-Cap DashboardQuality / Value / Momentum / Smart-Money over the whole long-term case — from filings + end-of-day prices.CORE TOOLPosition Size CalculatorCapital, risk %, entry and stop into an exact whole-share position size — with R-multiples.CORE TOOLMax PainWhere open interest pins the tape — strike walls, expected move, daily snapshots and an accuracy ledger that grades itself.CORE TOOLEarnings CalendarWho reports, when — filing-confirmed, ranked by size and typical move.CORE TOOLMonte Carlo SimulatorThousands of randomized market paths — sequence risk, not one misleading average.
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Every tool, organised by what it does.
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Every tool page here is server-rendered: the numbers live in the HTML, not in a JavaScript bundle that only runs for a logged-in browser. Paste any StockTools URL into ChatGPT, Claude, Perplexity or a crawler and it receives the same figures you see, with the source filing links attached — and llms.txt tells an assistant where everything lives. It costs nothing to check: fetch one of our ticker pages and the same page on a paid research tool, and compare what comes back.
Every calculator, by category
the A–Z index · 30 calculatorsPortfolio & returns10
Risk & position sizing7
Valuation calculators5
Options calculators2
Sharing & utilities2
Psychology1
Dividends1