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Market Scanners and Calculators
Scanners rebuilt from the previous close every trading day, and calculators that run entirely in your browser. Nothing you type is sent anywhere. Market data as of the Oct 8, 2026 close.
Market scanners and data
Updated from the previous close. Filter, rank and visualize the S&P 500 and the Treasury curve.
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Updated daily · Which stocks match my setup today?
Stock Screener
Filter every S&P 500 stock by sector, RSI, moving averages, distance from the 52-week high, volume surge and more.
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Updated daily · Where did the money go today?
Sector Heatmap
Every S&P 500 stock tiled by sector and colored by the day’s move, so you see rotation at a glance.
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Updated daily · Is the rally broad or narrow?
Market Breadth Dashboard
Advancers versus decliners, the share of stocks above their 50- and 200-day averages, new highs and lows, and sector returns.
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Updated daily · Which patterns printed yesterday?
Candlestick Pattern Scanner
Hammers, engulfing candles, dojis, stars and more, detected across the S&P 500 at the last close.
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Updated daily · What shape is the curve?
Treasury Yield Curve
Today’s Treasury curve from 1 month to 30 years, against one month and one year ago, with the 2s10s spread.
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Updated daily · Am I actually diversified?
Correlation Matrix
Pick up to ten major stocks and ETFs and see how their daily returns have moved together over the past year.
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Valuation
Working out what a business, or a share of one, is worth.
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Calculator · What is the business worth?
DCF Intrinsic Value Calculator
Discount projected free cash flows to a per-share value, with a terminal value and a margin of safety.
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Calculator · Is this stock expensive?
P/E and Earnings Yield Calculator
Trailing and forward P/E, PEG ratio and earnings yield, compared against the 10-year Treasury.
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Calculator · What did this investment really return?
Stock Return and CAGR Calculator
Total return including dividends, compound annual growth rate, and what the same money would have done at a benchmark rate.
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Options
Pricing, Greeks and payoff diagrams for single options and multi-leg strategies.
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Calculator · What does this strategy pay at expiry?
Options Strategy Builder
Combine up to four option legs and stock, then see the payoff diagram, breakevens, max profit and max loss.
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Calculator · What should this option cost?
Black-Scholes and Greeks Calculator
Theoretical call and put prices with delta, gamma, theta, vega and rho, plus an implied volatility solver.
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Calculator · What does this covered call yield?
Covered Call Return Calculator
Static return, if-called return, breakeven and annualized yield for a covered call position.
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Bonds and inflation
Yields, prices and what a return is worth after inflation.
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Calculator · What does this bond really yield?
Bond Yield Calculator
Current yield and yield to maturity from price, coupon and maturity, or price from a target yield.
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Calculator · What is my return after inflation?
Inflation-Adjusted Return Calculator
Turn a nominal return into a real one, and see what a sum of money buys after years of inflation.
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Portfolio and fees
Allocation, contributions and the quiet cost of fees over decades.
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Calculator · What do I buy and sell to rebalance?
Portfolio Rebalancing Calculator
Enter current holdings and target weights to get the exact buys and sells that restore the allocation.
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Calculator · What does investing monthly add up to?
Dollar-Cost Averaging Calculator
Project regular contributions with a growth rate and see shares bought, average cost and ending value.
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Calculator · What does this fund’s fee really cost?
Expense Ratio Cost Calculator
The dollar cost of a fund’s fee over 10, 20 and 30 years, against a cheaper alternative.
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Calculator · How long until my money doubles?
Rule of 72 Calculator
How long money takes to double at a given return, with the exact answer alongside the shortcut.
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Risk and sizing
How much to risk, how long recovery takes, and where leverage bites.
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Calculator · How much should I risk per trade?
Kelly Criterion Calculator
Optimal fraction of capital to risk from win rate and payoff ratio, with half- and quarter-Kelly.
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Calculator · Was that return worth the risk?
Sharpe Ratio Calculator
Paste a series of returns to get mean, volatility, Sharpe and Sortino ratios and maximum drawdown.
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Calculator · How long to recover from this loss?
Drawdown Recovery Calculator
The gain needed to recover from any loss, and how many years it takes at a given return.
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Calculator · When does my broker call me?
Margin Calculator
Buying power, the price that triggers a margin call, and what the loan costs over the holding period.
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Calculator · What does this short make or lose?
Short Selling Profit Calculator
Profit or loss on a short position after borrow fees, with the breakeven and the unbounded loss shown.
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How the scanners work
After each US close a script pulls daily bars for every S&P 500 stock, the major indices and ETFs, and the Treasury's yield curve. It computes RSI, moving averages, 52-week ranges, relative volume, candlestick patterns, sector aggregates, breadth statistics and a correlation matrix, then publishes the results as static files. The scanner pages read those files, so they load instantly and work the same for everyone.
The trade-off is freshness: everything is as of the last close, never intraday. For the questions these tools answer (what is in an uptrend, how broad the market is, what the curve looks like) a one-day lag rarely changes the answer.
How the calculators are built
Each calculator page shows its formula and a worked example whose numbers match the defaults in the tool, so you can check the arithmetic. The options and bond math lives in small tested libraries; the tests compare against textbook values such as the Black-Scholes price of an at-the-money one-year call at 20% volatility. If you find a result you cannot reproduce, tell us through the contact page.
About these tools
Are these tools free?
Yes, all of them, with no account, no email and no usage limit. The calculators run entirely in your browser. The scanners read a data file this site publishes each trading day, so they work without any connection to a broker or data vendor on your side.
Where does the market data come from?
S&P 500 constituents come from the published constituent list, daily prices from Yahoo Finance, and Treasury yields from the U.S. Treasury's own daily feed. Every indicator (RSI, moving averages, patterns, correlations) is computed by this site from those daily bars. The as-of date is shown on each scanner page.
Is anything I type stored?
No. Calculator inputs never leave your device; there is no server-side calculation and no logging of values. You can confirm this by watching the network tab in your browser while using any calculator.
How accurate are the calculators?
They implement the standard formulas (Black-Scholes, yield to maturity by iteration, the Kelly criterion, compound growth) and each one is tested against textbook values. They do not know your broker's fees, your tax rate or the exact contract terms, so treat results as a starting point and verify before acting.
Which tool should I start with?
If you invest in funds, the expense ratio calculator shows the cost that matters most over decades. If you trade, the Kelly criterion and drawdown recovery calculators cover the arithmetic that decides survival. If you follow markets, the breadth dashboard is the quickest daily read.