An acca combines multiple selections into one bet. The odds multiply together, which is why the potential returns look big — but every single leg has to win for the bet to pay out. Get four out of five correct and the acca loses.
How the maths work
Multiply the decimal odds of every leg together, then multiply by your stake. A four-fold at 2.0, 2.0, 2.0 and 2.0 combined is 16.0. A £5 stake returns £80 (£75 profit). Use our acca calculator for the maths.
Why accas look better than they are
Every additional leg reduces the probability of the acca winning. Four evens legs multiplied together imply only a 1-in-16 chance of the acca winning. Bookmakers happily offer accumulators because the more legs, the bigger their built-in margin.
Types of acca
- Double / Treble / Four-fold+: straight accas of 2, 3, 4+ legs.
- Bet Builder / Same-Game Acca: combines multiple markets in one match (e.g. Team A to win + BTTS Yes + Over 2.5).
- Lucky 15/31/63: full combination bets covering singles, doubles, trebles and multiples across your selections.
Acca insurance and boosts
Many UK bookmakers offer "acca insurance" — a refund (often as a free bet, subject to conditions) if only one leg lets you down. Others add "acca boosts" — an uplift on the final odds if all legs win. These are useful but read the specific promotion terms — minimum legs, minimum odds and stake conditions apply.
Sensible acca staking
Treat accas as low-stake, high-variance bets — think of them as entertainment rather than income. Keep individual acca stakes small, and remember: a two- or three-leg acca has a genuinely better hit-rate than an eight-leg one.