The Kelly Criterion is a formula for deciding how much to bet when you have an edge.
It tries to balance two things:
- Growing your bankroll.
- Not blowing yourself up when variance shows up.
Kelly tells you what percentage of your bankroll to stake based on the size of your edge.
Why staking matters
Finding a +EV bet is only half the job.
You also need to know how much to bet.
Bet too little, and your edge barely matters.
Bet too much, and normal variance can wreck you.
The Kelly Criterion gives you a mathematical starting point.
The basic idea
Bigger edge means bigger recommended stake.
Smaller edge means smaller recommended stake.
No edge means no bet.
That is the bit people forget.
Kelly is not a magic staking plan for random bets.
It only makes sense when the edge is real.
Why people use fractional Kelly
Full Kelly can be aggressive.
Very aggressive.
Even if the maths is correct, the swings can be horrible.
That is why many bettors use half Kelly, quarter Kelly, or even smaller.
You give up some theoretical growth, but the ride is much easier to survive.
The goal is not to maximise stress. The goal is to stay in the game long enough for the edge to pay out.
A simple example
Say your bankroll is $1,000.
Full Kelly says to bet 8%.
- Full Kelly stake = $80
- Half Kelly stake = $40
- Quarter Kelly stake = $20
The edge is the same.
The risk profile is not.
How Edge Hunters handles it
Edge Hunters can show sensible stake sizing based on the edge and your bankroll.
You still choose your risk level.
Some people want to be aggressive. Some people want smoother growth.
The key is that the stake should be tied to the edge, not emotion.
The key takeaway
Kelly helps turn edge into staking.
It does not make bad bets good.
It helps you size good bets properly.
Next up: Variance and bankroll Why even good bets can lose, and how to survive the swings.
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