Understand the numbers behind your plan.
Plan a savings goal, compare investing scenarios or understand a trade. Start with a worked example, then change the numbers in the corresponding calculator.
Start with the mechanism behind the number.
Each guide is maintained as an independent page with practical formulas, worked examples, common mistakes, FAQs, and links to primary documentation.
What Is Liquidation in Crypto Futures?
Understand crypto futures liquidation price, mark price, maintenance margin, leverage, bankruptcy price, and why exchange estimates differ.
How to Calculate Crypto Futures PnL
Calculate long and short crypto futures PnL, net profit after fees and funding, ROE, position quantity, and break-even price.
Cross Margin vs. Isolated Margin
Compare cross and isolated margin for crypto futures, including collateral scope, liquidation behavior, account risk, and practical use cases.
Maker vs. Taker Fees in Crypto Futures
Understand maker and taker orders, crypto futures fee calculations, round-trip cost, post-only orders, fee tiers, and break-even impact.
How Crypto Funding Rates Work
Learn how perpetual futures funding rates work, who pays whom, how to calculate funding payments, and how funding affects PnL and liquidation risk.
How to Calculate Crypto Position Size
Learn how to calculate crypto futures position size from account risk, entry price, stop loss, fees, slippage, leverage, and liquidation distance.
How to Calculate Crypto Average Entry Price
Learn how to calculate a weighted average crypto entry price across multiple buys or futures fills, including fees, target-average sizing, and partial closes.
How to Set a Stop Loss in Crypto Trading
Learn how to choose a crypto stop-loss level, connect it to account risk and position size, and understand trigger price, slippage, and order type.
How to Calculate Risk-Reward Ratio and R-Multiples
Learn how to calculate crypto risk-reward ratio, R-multiples, weighted take-profit targets, break-even win rate, and trading expectancy after costs.
How Dollar-Cost Averaging Works in Crypto Investing
Learn how crypto dollar-cost averaging works, how recurring purchases change average cost, and how to read fees, ROI, and historical backtests.
DCA vs. Lump Sum: How to Compare Crypto Strategies
Compare crypto DCA with lump-sum investing using equal budgets, market paths, fees, time in the market, and historical backtest limits.
How Long to Save $20,000 at $500 a Month?
Save $20,000 in 40 months at $500 a month without interest. Compare paycheck budgets, return assumptions, starting savings and missed deposits in U.S. dollars.
Built from primary and official documentation.
The library distinguishes general principles from exchange-specific implementation. Every document lists the references used to verify its definitions, formulas, and data methods.
Read the rule. Test the scenario.
Use the documentation to understand the mechanism, then move directly into a calculator with editable exchange assumptions.