FREE TOOLS

Calculators,
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Kelly, CLV, Monte Carlo, arbitrage, combined and a returns converter. Free for everyone.

Pro-grade, beginner-friendly

These are the same instruments professionals use — Kelly sizing, Monte Carlo, exposure and risk analysis. You can run every one from day one with sensible defaults; no finance background required. Go deeper whenever you're ready.

Kelly Calculator

Find your optimal allocation from edge and returns.

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CLV Calculator

Measure closing line value on any position.

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Portfolio Monte Carlo

Stress-test your portfolio over thousands of positions.

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Arbitrage Calculator

Split an allocation across brokers to lock in a guaranteed profit.

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Combined Calculator

Multiply legs into one price and see the true payout — and returns.

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Returns Converter

Switch between decimal, American, fractional and implied %.

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Hedge Calculator

Lock the same result either way — size the hedge that equalises both sides.

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EV Calculator

Turn your probability and the price into one number: is this position worth it?

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Which calculator for what?

A pro's workflow.

Each tool answers one question. Here's the order a disciplined investor runs them — from reading a price to proving an edge.

What is this price really saying?

Convert it to implied probability and strip the margin before you judge it.

Returns Converter

Is there any value here?

Compare your probability to the price — positive EV, or pass.

EV Calculator

How much should I allocate?

Turn your edge into a position size that maximizes long-run growth.

Kelly Calculator

Can my plan survive a bad run?

Simulate thousands of careers and read the drawdowns, not the average.

Portfolio Monte Carlo

Am I actually beating the market?

Closing line value is the earliest proof of a real, repeatable edge.

CLV Calculator

Can I lock a result early?

Size the opposite side to secure profit or cap a loss before it settles.

Hedge Calculator

Is there a guaranteed profit?

When two brokers disagree enough, cover every outcome for a locked return.

Arbitrage Calculator

What does a multi-leg really need?

See the true probability a combined position needs — usually more than it looks.

Combined Calculator

Want these automated?

Yoseri runs Kelly, CLV and Monte Carlo on every signal — and tracks the results for you.

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Calculators,no signup.

Kelly Calculator

CLV Calculator

Portfolio Monte Carlo

Arbitrage Calculator

Combined Calculator

Returns Converter

Hedge Calculator

EV Calculator

A pro's workflow.

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Calculators,
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