Accumulator

An accumulator (or "acca") is a single wager that combines four or more individual selections into one bet. Every selection must win for the accumulator to pay out. If even one selection loses, the entire bet is lost. The potential payout grows quickly with each added selection because the odds are multiplied together rather than added. Worked example: a five-fold accumulator with every leg priced at 2.00 produces a combined price of 2.00 × 2.00 × 2.00 × 2.00 × 2.00 = 32.00. A £10 stake therefore returns £320 (a £310 profit) if all five legs win. Mix the prices and the maths still holds: legs of 1.50, 2.00 and 3.00 give 1.50 × 2.00 × 3.00 = 9.00, so £10 returns £90. Why it matters: accumulators turn small stakes into large theoretical payouts, which is why they are so popular for football. The trade-off is probability. If each of those five legs is a genuine 50% shot, the chance of all five landing is 0.5^5 = 3.125% — roughly one in 32. The long combined price is simply the fair reflection of that low chance, before the bookmaker's margin is taken from every individual leg. Common mistake: stacking heavy favourites at short prices to feel "safe". Six legs at 1.20 only return 1.20^6 ≈ 2.99 — just under treble your money — yet a single upset still loses the lot. The margin compounds across every selection too, so accumulators carry a higher built-in house edge than singles. Compare to: Parlay, Double Bet.