The risk math every trade needs — free, instant, no sign-up. The same engine that
powers the EdgeLedger journal.
Position Size Calculator
How many units to buy/sell so you risk a fixed % of your account.
Risk amount
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Position size (units)
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Notional value
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Margin required
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Risk / Reward & Breakeven Win-Rate
Your reward-to-risk ratio, and the win rate you need just to break even at it.
Reward : Risk
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Breakeven win rate
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Risk (per unit)
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Reward (per unit)
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Crypto Liquidation Price Calculator
Estimated liquidation price for an isolated-margin perpetual position.
Est. liquidation price
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Move to liquidation
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Estimate only — isolated margin, linear contracts, fees & funding excluded.
Exchanges differ; always check your platform's figure.
Kelly Criterion & Expectancy
Is your edge real, and how much should you risk per trade?
Expectancy / trade
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Payoff ratio
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Full Kelly
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Half Kelly
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Quarter Kelly
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Negative Kelly = no edge: don't size up, fix the strategy. Most traders use ¼–½ Kelly.
Drawdown Recovery & Survival
The gain needed to recover a loss — and how many losing trades it takes to get there.
Gain to break even
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Losing trades in a row to reach it
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A 50% drawdown needs a 100% gain to recover. Protecting capital beats chasing returns.
Want all of this in one workbook that does the math automatically?
EdgeLedger Risk Toolkit — position sizer, planner, Kelly & drawdown.
Get the Toolkit — $12 →
Or the full Pro Journal to log & review every trade. Get Pro — $19 →