Investing
Compound interest, CAGR, dollar-cost averaging, total return, real return, and lump sum vs periodic comparisons for evaluating investment performance over any time horizon.
Stock Chart
Real-time stock prices with interactive candlestick charts and SMA overlays.
Compound Interest Comparator
Compare multiple investment scenarios side by side: monthly vs annual, tax-deferred vs taxable.
Margin Interest Calculator
Compute daily/monthly/annual margin interest cost for any brokerage rate.
Lump Sum vs Periodic
Compare upfront lump sum against dollar-cost averaging over time.
Sharpe & Sortino Ratio
Compute Sharpe and Sortino ratios to measure risk-adjusted returns.
DCA Price Averager
Compute real average cost per share from periodic buys: compare DCA vs lump sum.
Real Return (Inflation-Adjusted)
Adjust nominal returns for inflation with the Fisher equation: see real purchasing power.
Total Return
Price change + dividends + splits with CAGR breakdown and annualized return.
Time Weighted Return
Geometric linking of sub-period returns vs simple return with cumulative table.
Money Weighted Return
Compute IRR or XIRR from irregular cash flows with dates: measure your personal rate of return accounting for deposit...
CAGR Finder
Compound annual growth rate between two values over any period.
CAGR Reverser
Years needed to reach a target at a given CAGR with projection table.
Stock Split Adjuster
Adjust share count and cost basis after forward or reverse splits.
Position Sizing
Risk based share count from entry, stop loss, and portfolio risk percent.
Risk to Reward Ratio
Evaluate trades with RRR, Kelly criterion, and break even win rate.
Stock Average Down
Calculate New Breakeven Cost Basis When Buying Additional Shares.
Trailing Stop Loss
Generate Progressive Stop Loss Levels to Lock in Profits.
Unix Market Timezone
Convert Unix timestamps to global exchange session times.
Base64 Payload Tool
Encode, decode, and pretty print Base64 in the browser.
Cron Market Scheduler
Generate cron expressions aligned to market hours.
JWT Debugger
Decode JWT header and payload safely client side.
ETF Expense Ratio Simulator
Compare low vs high MER compounding drag over decades.
Inflation Erosion Calculator
See purchasing power decay of cash over time with year by year table.
Subscription Fatigue Audit
Aggregate recurring fees and 10 year investment opportunity cost.
Lifestyle Inflation Tracker
Track how much of each raise you save vs spend over your career.
Sinking Fund Planner
Smooth monthly savings targets for irregular annual expenses.
Lease vs Buy Calculator
10 year car lease vs buy cost with invested difference opportunity cost.
Broker Fee Break Even Matrix
Flat fee vs percentage broker costs and break even deposit size.
FX Spread Cost Calculator
Reveal hidden currency conversion fees in broker FX spreads.
Lost Decade Backtester
Simulate portfolio behavior during flat market periods with bundled historical data.
DCA Vs Lump Sum
Compare lump sum vs dollar cost averaging historically.
Cash Drag Estimator
Quantify opportunity cost of holding cash vs invested.
Kelly Criterion Position Sizer
Optimal bet size from win probability and payoff odds.
Tracking Error Calculator
Free tracking error and information ratio calculator. Measure active risk by comparing portfolio returns against a benchmark index over time.
Rolling Returns Visualizer
Free rolling returns calculator. Compute 3 year, 5 year, and 10 year rolling performance windows from any annual return series.
RSI Calculator
Calculate Wilder RSI from a closing price series, identify overbought and oversold zones, and inspect recent momentum readings privately in your browser.
ATR Calculator
Calculate Wilder Average True Range, normalize volatility against price, and estimate a risk based position size from high, low, and close data.