Betting maths and calculators
What is the best way to calculate an accumulator when one leg is void?
Direct answer
In a standard accumulator, a void leg is normally treated as decimal odds 1.00, so payout = stake × product of all non-void decimal odds. Same-game builders and promotional products may have special rules.
How to use this answer
This answer is based on the mathematical principle or published rule identified in the source below. If the question involves a live betting market, confirm its settlement definition before applying it to a specific bet.
Replace the void leg with decimal odds of 1.00 and multiply the remaining valid leg prices, subject to the operator's terms.
Use the precise stake, decimal odds, market terms and outcome probabilities when calculating the result. Expected value measures an average over hypothetical repetitions, not a guaranteed profit.