Parlay & Accumulator Calculator
Add each leg's decimal price, set a stake, and see the combined price plus what the whole slip returns if every leg lands.
Key terms, plainly put
A parlay (or accumulator) rolls several separate bets into one — every leg has to land for the whole thing to pay out. Prices multiply together, so a handful of modest legs can build into a big number surprisingly fast. Chance of winning falls just as fast, in the other direction.
The maths behind it
Combined price = leg 1 × leg 2 × leg 3 ..., then total back = stake × combined price. One leg missing and the whole slip loses — there's no partial credit.
Worked example
Three legs at 2.00, 1.80, and 1.50 combine to 2.00 × 1.80 × 1.50 = 5.40. A £10 stake returns £54.00 total if all three land — £44.00 profit. Miss any single leg and the whole bet is gone.
What each extra leg costs you
The part the adverts skip: probability drops off faster than the payout climbs. Three common per-leg prices, carried out to six legs.
Short-priced legs (1.50 each, ~67% per leg)
| Legs | Combined odds | Combined probability |
|---|---|---|
| 1 | 1.50 | 66.7% |
| 2 | 2.25 | 44.4% |
| 3 | 3.38 | 29.6% |
| 4 | 5.06 | 19.8% |
| 5 | 7.59 | 13.2% |
| 6 | 11.39 | 8.8% |
Evens legs (2.00 each, 50% per leg)
| Legs | Combined odds | Combined probability |
|---|---|---|
| 1 | 2.00 | 50.0% |
| 2 | 4.00 | 25.0% |
| 3 | 8.00 | 12.5% |
| 4 | 16.00 | 6.3% |
| 5 | 32.00 | 3.1% |
| 6 | 64.00 | 1.6% |
Value legs (2.50 each, 40% per leg)
| Legs | Combined odds | Combined probability |
|---|---|---|
| 1 | 2.50 | 40.0% |
| 2 | 6.25 | 16.0% |
| 3 | 15.63 | 6.4% |
| 4 | 39.06 | 2.6% |
| 5 | 97.66 | 1.0% |
| 6 | 244.14 | 0.4% |
Common questions
Why do combined odds grow so much faster than any single leg?
Because prices multiply rather than add — each leg scales the whole payout, not just adds a bit onto it. It's also exactly why the chance of every leg landing shrinks fast as legs pile up.
Does one leg losing wreck the whole bet?
Yes, on a standard parlay — every leg needs to win. Some bookmakers offer separate "each-way" or "insurance" accumulator variants that soften this, but the plain version pays nothing if any leg falls.
Is there a cap on how many legs I can add?
Not here — add as many as the slip needs. Just bear in mind that combined odds swell quickly, and so does the risk of a wipeout.