Judge the amount of money to trade

External question — Personal Finance Stack Exchange Author: David Original post: https://money.stackexchange.com/questions/155248 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I have been day trading for about a year. I got some statistics on a stock market pattern. The latter gives me an 82% probability of occurring and an expected gain of 13% per trade. I'm having trouble judging how much stock to buy based on X amount of money to maximize my profit. I had thought of using Kelly's criterion, but I'm not sure if it works in day trading. Can you give me a formula or advice for how many shares I should buy per trade? In general, my pattern works well, but I feel like I could greatly increase my profit per trade.