Master position sizing, portfolio risk, and the mathematics of profitable trading
"Risk comes from not knowing what you're doing." - Warren Buffett
The #1 difference between profitable traders and those who blow up their accounts is disciplined risk management.
Master these concepts and you'll survive to trade another day.
Best for beginners and small accounts. Slow growth but maximum survival.
Sweet spot for most traders. Balanced growth with manageable drawdowns.
For experienced traders only. High growth potential but volatile equity curve.
The Kelly Criterion is a mathematical formula used to determine optimal position sizing based on your edge in the market.
Kelly % = W - [(1 - W) / R]
Where: W = Win Rate (decimal), R = Win/Loss Ratio
Portfolio heat is the total percentage of your account currently at risk across all open positions.
The R:R ratio compares your potential profit (reward) to your potential loss (risk) on each trade.
Breakeven Win Rate Formula: 1 / (1 + R:R Ratio)
Professional traders use the 2% rule: Never risk more than 2% of your account on a single trade.
Example with $10,000 account:
Notice: You're using 40% of capital but only risking 2%. This is normal and correct. Position size โ Risk amount!
As your account grows, your position sizes should grow proportionally to maintain consistent risk percentage.
| Account Size | 2% Risk | Max Shares (at $5 risk) |
|---|---|---|
| $5,000 | $100 | 20 shares |
| $10,000 | $200 | 40 shares |
| $25,000 | $500 | 100 shares |
| $100,000 | $2,000 | 400 shares |