Quarter Kelly
--
Most conservative.
Inputs
Use your win rate and average payoff ratio.
Enter assumptions, then calculate a sizing range.
Sizing view
Read full Kelly first, then compare calmer bands.
Waiting for a valid edge
--
A positive Kelly fraction appears when the assumed edge turns positive.
Half Kelly
--
Balanced reference.
Full Kelly
--
Maximum growth case.
Risk temperature
Sizing spectrum
The marker stays near calm or pushes toward assertive sizing depending on the Kelly fraction.
Waiting for a scenario
What the calculator assumes
This tool uses only your win rate and average profit / loss ratio. It returns full, half, and quarter Kelly references. It does not estimate the edge for you, and it does not replace account-level risk limits.
Examples: compare a 55% setup at 1.8R, sanity-check a discretionary trade plan, or explain fractional Kelly sizing to a teammate.
FAQ: This calculator runs locally and does not forecast win rate for you. Use it as a sizing reference alongside account-level risk limits and drawdown rules.
Quick guide
Use cases, answers, and nearby tools
Compact below-tool notes that help first-run users and repeated visitors move faster without changing the main interface.
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How to use
Run a clean first pass
- Enter win probability and average profit / loss ratio.
- Calculate the edge and compare quarter, half, and full Kelly sizing bands.
- Use the spectrum and result notes to sanity-check how aggressive the fraction feels.
Examples
Real jobs this page helps with
- Trade plan sizingCompare how a 55 percent setup at 1.8R changes across quarter, half, and full Kelly references.
- Risk discussionShow a teammate why fractional Kelly is often calmer than using the theoretical maximum size.
FAQ
What people usually want to know
- Does it estimate win rate for me?
- No. You provide the edge assumptions, and the page returns sizing references from those inputs.
- Should I always use full Kelly?
- Not necessarily. Many users treat half or quarter Kelly as a calmer reference when edge estimates are noisy.
- Is any market data required?
- No. This is a static local calculator driven entirely by your inputs.