Kelly Criterion Calculator for Stocks
Find the optimal share of your bankroll to put into a trade.
● Runs in your browserNothing is storedFree
Inputs
The Kelly Criterion is a formula used to determine the optimal size of a series of bets to maximize long-term growth of capital. Enter your win probability and win/loss ratio to calculate the optimal position size.
Optimal position size
Your optimal bet size as a share of bankroll appears here.
- 01Enter your estimated win probability as a percentage.
- 02Enter the win/loss ratio: how much you gain on a win relative to what you lose on a loss.
- 03Click "Calculate" to get the Kelly fraction as a percentage of your bankroll.
🔒Private by default. This tool is designed for convenience and does not store any of your data. All processing is done in your browser.