Betting tools

The calculators behind the maths

Six free tools for sizing bets and reading prices — each on its own page, mobile-first, and updating as you type. Everything runs in your browser and nothing is stored.

Arbitrage

Split a stake across two books to lock a margin while prices hold.

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Expected Value (EV)

See whether a price is worth more than it costs over volume.

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Kelly Staking

Size a stake from your edge and bankroll.

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No-Vig Fair Odds

Strip the book's margin to reveal the fair price.

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Odds Converter

Convert decimal, American, fractional and implied odds.

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Vig & Hold

Measure the margin baked into a market.

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The basics

What the numbers mean

Arbitrage

What is arbitrage betting?

Arbitrage means backing every outcome of an event across different books at prices that, together, cover the whole market for less than it pays out. When the numbers line up, the position carries a margin while those prices hold — it depends on the odds not moving and on staking each side correctly, so it is a market inefficiency, not a payout promise.

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+EV

What is +EV betting?

A bet is positive expected value when the price on offer implies worse odds than the real chance of the outcome. Over many bets of that kind the maths leans in your favour, even though any single bet can lose. The edge is statistical and shows up across volume — never in a guarantee about one result.

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Australia

Is arbitrage legal in Australia?

Arbitrage betting is legal for Australian punters — you are simply placing ordinary bets at licensed bookmakers. Bookmakers don't like it, though: they may limit your stakes or close your account if they spot the pattern.

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For education only — not financial advice. 18+. Gamble responsibly. Past performance does not guarantee future results.

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