Weekend Accumulators — Build Your Multi-Leg Bet
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Accumulator bets (parlays) combine multiple selections into one bet, multiplying odds for potentially massive returns — but every leg must win. With Premier League, Champions League, and horse racing in full swing, weekend accumulators are hugely popular. This calculator supports 2-10 selections, shows cumulative odds building leg by leg, and calculates implied probability so you know exactly how likely your acca is to land.
Ready to run the numbers?
Why: Accumulators are the most popular bet type in UK and European sports betting — a modest stake can return hundreds or thousands. But most bettors don't calculate the true implied probability of their acca landing. A 4-fold at 2.0 odds per leg has only a 6.25% chance of winning. Understanding cumulative probability, comparing single bets vs accas, and knowing about combination bets (Trixie, Patent, Lucky 15, Yankee) gives you a realistic view of risk and reward.
How: Combined odds = Leg 1 odds × Leg 2 odds × ... × Leg N odds. Total return = stake × combined odds. Implied probability = 1 / combined odds × 100. For each-way accumulators, place returns are calculated at the fractional odds. Combination bets (Lucky 15, Trixie, Patent, Yankee) are multiple accumulators covering different subsets of selections — this calculator shows the total stake required and potential returns for each type.
Run the calculator when you are ready.
Sample Accumulators
Click a scenario to load example values:
⚽ Weekend Football 4-Fold
Typical Premier League accumulator: 4 match results at short odds
🏆 Champions League 3-Fold
Three Champions League winners treble
🎯 Longshot 6-Fold
High-risk 6-fold with bigger odds — huge potential return
🏇 Horse Racing 5-Fold
Five race winners across a Saturday card
🥅 Both Teams to Score 5-Fold
Popular BTTS market with shorter odds per leg
🏀 NBA Parlay 4-Leg
American-style parlay on NBA spreads and totals
Bet Details
Odds per Selection (Decimal)
accumulator_calc.sh
Leg-by-Leg Breakdown
| Leg | Odds | Cumulative Odds | Return at This Leg | Win Prob at This Leg |
|---|---|---|---|---|
| Selection 1 | 2.00 | 2.00 | £20.00 | 50.00% |
| Selection 2 | 2.50 | 5.00 | £50.00 | 20.00% |
| Selection 3 | 1.80 | 9.00 | £90.00 | 11.11% |
| Selection 4 | 3.00 | 27.00 | £270.00 | 3.70% |
Cumulative Return by Leg
Profit vs Stake
Calculation Breakdown
Leg 1
2.00
Leg 2
2.50 → cumulative: 5.00
Leg 3
1.80 → cumulative: 9.00
Leg 4
3.00 → cumulative: 27.00
Combined Odds
2.00 × 2.50 × 1.80 × 3.00 = 27.00
Potential Return
£10.00 × 27.00 = £270.00
Profit
£270.00 − £10.00 = £260.00
Implied Win Probability
1 / 27.00 = 3.70%
Risk Assessment
Very High Risk
Responsible Gambling
Gambling involves risk. Only bet what you can afford to lose. If you need support, contact GamCare (0808 8020 133) or visit BeGambleAware.org.
For educational and informational purposes only. Verify with a qualified professional.
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CalculateWhat is an Accumulator?
An accumulator (or acca/parlay) combines multiple selections into one bet. All legs must win for the bet to pay out. Odds multiply together, creating high potential returns but low win probability.
Risk vs Reward: A 4-fold at 2.0 each = 16.0 combined odds (~6.25% win chance). One losing leg = total loss.
Bet Types
Lucky 15
4 selections = 15 bets (1 four-fold, 4 trebles, 6 doubles, 4 singles)
Lucky 31 / 63
5 or 6 selections with full coverage of combinations
Trixie
3 selections = 4 bets (1 treble + 3 doubles)
Patent / Yankee
Patent: 3 selections, 7 bets. Yankee: 4 selections, 11 bets
Official Sources
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