Kelly Criterion Calculator

Optimal position sizing for asymmetric growth

How does this help you?

The Kelly Criterion tells you how much of your portfolio to put into one trade based on your win rate and average win/loss sizes.

Too much per trade = one bad loss wipes you out. Too little = your account grows painfully slow. Kelly finds the sweet spot.

Half Kelly (recommended) gives ~75% of optimal growth with far less volatility. Your portfolio: $1000.00

Win Rate55%

Average Win15%

Average Loss8%

Account: $1000.00|Edge: 4.7%

Full Kelly

31.0%

Size: $310.00

Portfolio: 31%

Ruin: 1.9%

Half Kelly

15.5%

Size: $155.00

Portfolio: 16%

Ruin: 0.0%

Quarter Kelly

7.8%

Size: $77.50

Portfolio: 8%

Ruin: 0.0%

Growth Projections (Half Kelly)

1 trades

$1066.66

5 trades

$1380.79

10 trades

$1906.58

20 trades

$3635.06

30 trades

$6930.54

40 trades

$13213.64

50 trades

$25192.89

60 trades

$48032.32

70 trades

$91577.58

80 trades

$174600.20

90 trades

$332889.69

100 trades

$634681.64