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A bettor's calculations, done right
Six calculators Babeth uses all the time. Everything runs in your browser, nothing is sent.
Stake calculator (Kelly)
How much to stake for a given chance and odds? The Kelly formula maximizes bankroll growth; we take only a fraction to smooth drawdowns, never more than 5 % per bet.
Edge
+9.2 %
Full Kelly
8.4 %
Fraction applied
2.5 %
Suggested stake
25.09 €
BabethFull Kelly is theoretically optimal, but it assumes your probability is exact. It never quite is: hence the fraction. The 5 % cap is the rule that keeps you in the game.
Babeth runs these calculations on 4,000 markets every 45 seconds, with the true probability of every bet.
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