Portfolio Margin Calculator

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How It Works
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Initial vs Maintenance Margin

Reg T - Set by Federal Reserve (initial margin):

Initial: 50% long, 150% short
Maintenance: 25% long, 30% short (typical)

Portfolio Margin

Risk-based margin model (for experienced traders with $125k+):

Assumes ±15% price move
Uses worst-case scenario loss
Adds 15% buffer for volatility
More capital efficient

Key Insight: Portfolio margin typically requires 50-70% less capital because it considers position correlation and hedges, not just individual position risk.

Reg T Maintenance Margin

25% long / 30% short

Portfolio Margin Required

Based on ±15% stress scenario

Capital Savings

Leverage Multiplier

0.00x

Efficiency Ratio Explained: Portfolio Margin ÷ Reg T Margin. Lower is better.
Example: 0.69x means you need only 69% as much capital with PM vs Reg T, giving you 45% more buying power with the same capital.

Total Position Value

0 positions

Margin Efficiency Ratio

0.00x

PM Capital / RegT Capital (lower is better)

Margin Requirement Comparison

Maintenance Margin Requirements

Long Position %

Short Position %

Reg T Breakdown

Portfolio Margin Breakdown

Stress Testing Analysis
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Shows absolute margin amounts and P&L at each price level. Green PM = better than Reg T, Red = worse. (Price = quantity-weighted average)

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How It Works ?