Trading Formulas Library — Crypto & Stocks

🧮 Interactive Trading Tools

Plug-and-play calculators built for retail traders & quants. All math runs locally in your browser — no data leaves your device.

Position Size Calculator

Risk a fixed % of your account per trade. The most reliable sizing method for retail traders.

Account Balance ($) Risk per Trade (%) Entry Price Stop Loss Price Side

Risk / Reward Ratio

Plan trades with a clear R-multiple before you enter. Aim for RRR ≥ 2.

Entry Price Stop Loss Take Profit Side

Profit & Loss (with Leverage)

Compute realized PnL for spot & leveraged positions, including ROE % and fees.

Side Entry Price Exit Price Position Size (units) Leverage (×) Total Fee (%, entry+exit)

Kelly Criterion

Optimal bet size for long-term growth. In practice, use Half-Kelly or Quarter-Kelly.

Win Rate (%) Avg Win (R multiple) Avg Loss (R multiple, >0) Kelly Fraction

Compound / DCA Growth

Project long-term portfolio growth with regular contributions and a fixed annual return.

Starting Capital ($) Contribution per Period ($) Annual Return (%) Compounding Years

Liquidation Price (Crypto Futures)

Estimate the price at which your leveraged position gets liquidated (isolated margin).

Side Entry Price Leverage (×) Margin ($) Maintenance Margin Rate (%)

Stop Loss Calculator

Stop loss by ATR multiple. Adapts to volatility.

Entry Price ATR (n) ATR Multiplier Method

Expectancy & Win-Rate Analysis

Find out whether your system is profitable before risking real money.

Win Rate (%) Avg Win (R) Avg Loss (R, >0) Trades per Month

📚 Formula Library

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About This Library

Every formula here is rewritten (with explanations, mathematical formulas, and example code in Python & JavaScript) from open-source projects such as: TA-Lib, pandas-ta, freqtrade, Backtrader, jesse-ai, ccxt, vectorbt, quantstats, statsmodels, Hummingbot, Uniswap, Hyperliquid, Deribit, and more.

Goal: be a quick reference for traders & quants who want to implement indicators and strategies without bouncing between dozens of docs. All formulas are free to study & use.

⚠️ Disclaimer: This content is for educational purposes only. Trading carries risk; profit is never guaranteed. Always do your own research (DYOR) and apply sound money management.

☕ Support This Project

All formulas & tools are free. If this library helped your trading, consider buying me a coffee — it keeps the project alive. 🙏

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