Building a Multi: Understanding Combined Probability

Multi bets (also called parlays or accumulators) combine multiple selections into a single wager. The combined odds are calculated by multiplying the individual decimal odds together. A 3-leg multi at 2.00, 1.80, and 2.20 produces combined odds of 7.92.

The Hidden Cost of Each Extra Leg

The critical insight most punters miss: each leg you add dramatically reduces your overall probability of winning. A single bet at 2.00 has a 50% implied chance. Add a second leg at 2.00 and your chance drops to 25%. Add a third and you are down to 12.5%. The returns look attractive, but the maths works heavily against you with every additional leg.

When Multis Make Sense

Multis are best used sparingly and only when you have genuine independent edges across multiple markets. They should never be your primary betting strategy. Use this calculator to visualise the trade-off before placing any multi bet.