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OddsDerby

Free tool

Bet calculator

Work out returns for accumulators (multis, parlays) and system bets. Mark selections as won or lost and add an accumulator bonus percentage.
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Total odds
6.22
Returns
621.60
Profit
521.60
Implied chance all win
16.09%

Want the background? Read our guide: accumulator betting guide.

Frequently asked questions

How are accumulator odds calculated?

Multiply the decimal odds of every selection. Three selections at 1.85, 2.10 and 1.60 give total odds of 6.22, so a 100 stake returns 622 if all win.

What is a system bet?

A system bet places every combination of a given size from your selections — for example a 2/3 system is three doubles. You can win something even if not every selection wins.

Does the calculator include acca bonuses?

Yes. Enter the bonus percentage your bookmaker adds to winning accumulators and we add it to the profit, as most bookmakers do.