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Dynamic Position Sizer

How many contracts should you trade RIGHT NOW? Evaluates Kelly Criterion, drawdown buffer, daily loss limit, volatility regime, and time of day to find your optimal size. Knows rules for 25 prop firm accounts.

Kelly Calculator →Recovery Calculator →Prop Firm Simulator →

Current Conditions

$0
10:00
12 AM6 AM12 PM6 PM11 PM

Trading Stats

$150
$100
55%
3
Edge/Trade: $37.50

Real-Time Position Sizing

Set your firm, current P&L, regime, and time. Get an instant recommendation that accounts for all constraints simultaneously. Or generate a full sizing grid to keep as a reference card.

Constraints checked:

  • - Quarter Kelly (conservative)
  • - Drawdown buffer (20% cap)
  • - Daily loss limit (50% cap)
  • - Firm max contracts
  • - Consistency rules

Multipliers:

  • - Quiet/Steady: 100%
  • - Elevated: 75%
  • - Volatile: 50%
  • - Extreme: 25%
  • - Time-of-day: 60-100%