Precision tools for traders
Free calculators for position sizing, risk, and cost basis — built for stock, options, and futures traders. No signup, no fluff; your numbers never leave your browser.
- Position Size CalculatorSize any stock, options, or futures trade from your account risk and stop.
- Risk / Reward Ratio CalculatorReward-to-risk, breakeven win rate, and expectancy in R.
- Stop-Loss CalculatorDollar and percentage loss at your stop, for any share count.
- Kelly Criterion CalculatorFull, half, and quarter Kelly position sizes from your edge.
- Average Down CalculatorSee your new average after buying more — or how many shares to hit a target average.
- Stock Average CalculatorWeighted average cost basis across any number of buy lots.
- Futures Profit CalculatorP&L, ticks, and per-contract profit for ES, NQ, CL and more.
- Futures Position Size CalculatorRisk-based contract sizing with tick values built in.
- Covered Call CalculatorStatic, if-called, and annualized returns plus breakeven and max profit.
- Cash-Secured Put CalculatorReturn on cash, annualized yield, and effective buy price.
- CSP CalculatorCash-secured put returns at a glance.
- Wheel Strategy CalculatorTrack how premiums lower your cost basis and break-even.
- Trading Compound CalculatorAccount growth from a per-period gain — including the 1%-a-day math.
- Implied Move CalculatorExpected move from implied volatility or the ATM straddle.
- Expected Move CalculatorThe one-standard-deviation options price range.
- Earnings Expected Move CalculatorThe move the market prices into an earnings report.
- Options Greeks CalculatorBlack-Scholes price plus delta, gamma, theta, vega, rho.
- Trailing Drawdown CalculatorProp-firm stop-out level and cushion (Topstep / Apex style).
- Prop Firm Payout CalculatorYour take-home after the profit split and the fees you paid to get funded.
- R-Multiple CalculatorScore a closed trade in units of your initial risk.
- Stock Stop-Loss CalculatorDollar and percentage loss at your stop on a stock.
New — Guides
Learn the math behind the tools
Plain-English guides to position sizing, risk/reward, averaging down, and the wheel strategy — each paired with a calculator. →
📊 Reference — The Trader's Math
Win rate, reward-to-risk & drawdown recovery
The exact win rate you need at every reward-to-risk ratio, an expectancy grid, and the gain it takes to recover any drawdown. Free to cite. →
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