Quick answer: To work out a bet, multiply the odds of every selection to get the total odds, then multiply by your stake. Three games at 1.50, 1.80 and 2.00 give total odds of 5.40, so ₦500 returns ₦2,700 if all three win, and that slip wins roughly 1 time in 5. Use the free calculator below for accas, acca boosts, system bets and your real chance of winning.
Estimates only. Check the final figures on your bet slip. No result is guaranteed. 18+
How to use the bet calculator
- Acca payout: enter your stake and the odds of each game. You see the total odds, your return, the PrimeStakes acca boost (20% extra winnings on total odds of 10.00 or more) and your real chance of winning.
- System bet: enter your total stake, choose the system (for example 2/3) and the odds. Untick any game that lost to see what you still win.
- Real chance: turn any odds into a percentage, and check the bookmaker's margin on a match.
How accumulator odds work
Accumulator (acca) odds multiply. That is why small stakes can return a lot, and also why accas lose so often.
| Games | Odds each | Total odds | ₦500 returns | Rough chance all win |
|---|---|---|---|---|
| 2 | 1.50 | 2.25 | ₦1,125 | About 1 in 2 |
| 3 | 1.50 | 3.38 | ₦1,688 | About 1 in 3 |
| 5 | 1.50 | 7.59 | ₦3,797 | About 1 in 8 |
| 8 | 1.50 | 25.63 | ₦12,814 | About 1 in 26 |
| 12 | 1.50 | 129.75 | ₦64,873 | About 1 in 130 |
The rough chance ignores the bookmaker's margin, so the real chance is a little lower. Each extra game makes the payout bigger and the chance of winning smaller.
Acca boosts explained
Many Nigerian bookmakers add a bonus to winning accas. PrimeStakes adds 20% extra winnings on multibets with total odds of 10.00 or more, from a ₦100 stake. Other bookmakers use a ladder that grows with the number of selections. Boosts only pay when every selection wins, so do not add weak games just to reach a bigger boost. Check the current terms on your bookmaker before you rely on any boost.
System bets explained
A system bet (also called a combo bet) splits your selections into smaller accas, so one losing game does not always lose everything.
| System | What it creates | Bets |
|---|---|---|
| 2/3 | Every double from 3 games | 3 |
| 2/4 | Every double from 4 games | 6 |
| 3/4 | Every treble from 4 games | 4 |
| 3/5 | Every treble from 5 games | 10 |
| 4/5 | Every 4-fold from 5 games | 5 |
Your total stake is shared equally between the bets. A ₦600 2/3 system is three ₦200 doubles. If one game loses, one double still wins. System bets cost more per possible win than a single acca, but they lose less often.
Odds, implied chance and the bookmaker margin
Decimal odds hide a chance: 1 divided by the odds. Odds of 2.00 mean about 50%, 1.50 about 67% and 4.00 about 25%.
Bookmakers set odds so that the chances of all outcomes add up to more than 100%. The extra is their margin. For a match priced at home 2.10, draw 3.30 and away 3.60, the chances add up to about 105.7%, so the margin is about 5.7%. Lower margins mean fairer odds for you. Check any match in the Real chance tab.
Common mistakes the calculator helps you avoid
- Adding a "banker" at 1.10 to pad out a slip. It barely raises the odds but adds another way to lose.
- Chasing a bigger boost. Extra games to reach a boost threshold usually cost more than the boost pays.
- Misreading system bets. The big payout shown is only if every game wins; check the ticked-results line.
- Forgetting the stake. Profit is return minus stake. A ₦500 slip that returns ₦600 is ₦100 profit.
Where to use your numbers
Once you are happy with a slip, place it on a licensed bookmaker. CodeDey recommends PrimeStakes: licensed by the Ekiti State Lotteries and Gaming Commission (EKS/0034/26), ₦100 minimum deposit, most withdrawals in 2–5 minutes, and a 20% acca boost on 10.00+ odds. Read our PrimeStakes review or rebuild a slip from another bookmaker with the booking code converter.
Set a budget before you bet, and stop when it is gone. See our responsible gambling guide.
Questions people ask
How do I calculate accumulator winnings?
Multiply the odds of every selection together to get the total odds, then multiply by your stake. Three games at 1.50, 1.80 and 2.00 give total odds of 5.40, so a ₦500 stake returns ₦2,700 if all three win.
How does the PrimeStakes acca boost work?
PrimeStakes adds 20% extra winnings on multibets with total odds of 10.00 or more, from a ₦100 stake. Tick the PrimeStakes boost option in the calculator to estimate it, and check the current terms on PrimeStakes.
What is a system bet?
A system bet splits your selections into smaller accumulators. A 2/3 system on three games creates three doubles, so you can still win something if one game loses. Your stake is divided equally across all the combinations.
What does implied probability mean?
It is the chance of an outcome hidden in the odds: 1 divided by the decimal odds. Odds of 2.00 mean about 50%, odds of 4.00 about 25%. Bookmakers add a margin, so the real chance is a little lower.
What is the bookmaker margin?
Add up the implied probabilities of every outcome in a market. For a match with home 2.10, draw 3.30 and away 3.60, the total is about 105.7%, so the margin is about 5.7%. Lower margins mean better value for players.
Is this calculator free?
Yes. It is free, needs no login and runs on your phone. Nothing you type is sent anywhere.