Irish Lotto Odds Calculator

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Calculate Lotto Odds

Balls to be drawn: Total number of prize levels:
From a pool of: Tick to include bonus balls:
Bonus balls to be drawn: Prize levels that involve
matching a bonus ball:
Bonus ball name:
Odds for Popular Lotteries:

Calculated Odds
Numbers Matched Odds Show Working Out +
6 Main Numbers (Jackpot) 1 in 10,737,573.000 Show/Hide ›

The odds for this prize level are not influenced by any 'Bonus Balls' and only the variables associated with the main ball pool are required to calculate the correct odds. The following formula is therefore used (Please note: calculations have been rounded):

C(n,r)
C(r,m)
×
C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
C(6,6)
×
C(47-6,6-6)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 6 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
6!
6! × (6 - 6)!
×
41!
0! × (41 - 0)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,6) = 6! ÷ (6! × (6-6)!)
C(47-6,6-6) = 41! ÷ (0! × (41-0)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
1 × 1
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
6! ÷ (6! × (6-6)!) = 1
41! ÷ (0! × (41-0)!) = 1
10,737,573 = 10,737,573.000
1
Calculate:
10,737,573 ÷ (1 × 1) = 10,737,573.000
5 Main Numbers + Bonus Ball 1 in 1,789,595.500 Show/Hide ›

The odds for this prize level are directly influenced by the Bonus Ball. Since the Bonus Ball is drawn from the same pool as the main numbers, the following formula is used (Please note: calculations have been rounded):

C(n,r)
r - m
n - r
× C(r,m) × C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
6 - 5
47 - 6
× C(6,5) × C(47-6,6-5)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 5 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
6 - 5
47 - 6
×
6!
5! × (6 - 5)!
×
41!
1! × (41 - 1)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,5) = 6! ÷ (5! × (6-5)!)
C(47-6,6-5) = 41! ÷ (1! × (41-1)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
0.0244 × 6 × 41
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
(6-5) ÷ (47-6) = 0.0244
6! ÷ (5! × (6-5)!) = 6
41! ÷ (1! × (41-1)!) = 41
10,737,573 = 1,789,595.500
6
Calculate:
10,737,573 ÷ (0.0244 × 6 × 41) = 1,789,595.500
5 Main Numbers 1 in 44,739.888 Show/Hide ›

The odds for this prize level are indirectly influenced by the Bonus Ball. Even though this prize level only involves matching 5 main numbers, the fact that you can also match 5 main numbers and a Bonus Ball means the odds of matching 5 main numbers alone are increased. Since the Bonus Ball is also drawn from the same pool as the main numbers, the following formula is used (Please note: calculations have been rounded):

C(n,r)
n - r - r + m
n - r
× C(r,m) × C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
47 - 6 - 6 + 5
47 - 6
× C(6,5) × C(47-6,6-5)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 5 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
47 - 6 - 6 + 5
47 - 6
×
6!
5! × (6 - 5)!
×
41!
1! × (41 - 1)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,5) = 6! ÷ (5! × (6-5)!)
C(47-6,6-5) = 41! ÷ (1! × (41-1)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
0.9756 × 6 × 41
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
(47-6-6+5) ÷ (47-6) = 0.0244
6! ÷ (5! × (6-5)!) = 6
41! ÷ (1! × (41-1)!) = 41
10,737,573 = 44,739.888
240
Calculate:
10,737,573 ÷ (0.9756 × 6 × 41) = 44,739.888
4 Main Numbers + Bonus Ball 1 in 17,895.955 Show/Hide ›

The odds for this prize level are directly influenced by the Bonus Ball. Since the Bonus Ball is drawn from the same pool as the main numbers, the following formula is used (Please note: calculations have been rounded):

C(n,r)
r - m
n - r
× C(r,m) × C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
6 - 4
47 - 6
× C(6,4) × C(47-6,6-4)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 4 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
6 - 4
47 - 6
×
6!
4! × (6 - 4)!
×
41!
2! × (41 - 2)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,4) = 6! ÷ (4! × (6-4)!)
C(47-6,6-4) = 41! ÷ (2! × (41-2)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
0.0488 × 15 × 820
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
(6-4) ÷ (47-6) = 0.0488
6! ÷ (4! × (6-4)!) = 15
41! ÷ (2! × (41-2)!) = 820
10,737,573 = 17,895.955
600
Calculate:
10,737,573 ÷ (0.0488 × 15 × 820) = 17,895.955
4 Main Numbers 1 in 917.741 Show/Hide ›

The odds for this prize level are indirectly influenced by the Bonus Ball. Even though this prize level only involves matching 4 main numbers, the fact that you can also match 4 main numbers and a Bonus Ball means the odds of matching 4 main numbers alone are increased. Since the Bonus Ball is also drawn from the same pool as the main numbers, the following formula is used (Please note: calculations have been rounded):

C(n,r)
n - r - r + m
n - r
× C(r,m) × C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
47 - 6 - 6 + 4
47 - 6
× C(6,4) × C(47-6,6-4)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 4 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
47 - 6 - 6 + 4
47 - 6
×
6!
4! × (6 - 4)!
×
41!
2! × (41 - 2)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,4) = 6! ÷ (4! × (6-4)!)
C(47-6,6-4) = 41! ÷ (2! × (41-2)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
0.9512 × 15 × 820
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
(47-6-6+4) ÷ (47-6) = 0.0488
6! ÷ (4! × (6-4)!) = 15
41! ÷ (2! × (41-2)!) = 820
10,737,573 = 917.741
11,700
Calculate:
10,737,573 ÷ (0.9512 × 15 × 820) = 917.741
3 Main Numbers + Bonus Ball 1 in 688.306 Show/Hide ›

The odds for this prize level are directly influenced by the Bonus Ball. Since the Bonus Ball is drawn from the same pool as the main numbers, the following formula is used (Please note: calculations have been rounded):

C(n,r)
r - m
n - r
× C(r,m) × C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
6 - 3
47 - 6
× C(6,3) × C(47-6,6-3)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 3 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
6 - 3
47 - 6
×
6!
3! × (6 - 3)!
×
41!
3! × (41 - 3)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,3) = 6! ÷ (3! × (6-3)!)
C(47-6,6-3) = 41! ÷ (3! × (41-3)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
0.0732 × 20 × 10,660
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
(6-3) ÷ (47-6) = 0.0732
6! ÷ (3! × (6-3)!) = 20
41! ÷ (3! × (41-3)!) = 10,660
10,737,573 = 688.306
15,600
Calculate:
10,737,573 ÷ (0.0732 × 20 × 10,660) = 688.306
3 Main Numbers 1 in 54.340 Show/Hide ›

The odds for this prize level are indirectly influenced by the Bonus Ball. Even though this prize level only involves matching 3 main numbers, the fact that you can also match 3 main numbers and a Bonus Ball means the odds of matching 3 main numbers alone are increased. Since the Bonus Ball is also drawn from the same pool as the main numbers, the following formula is used (Please note: calculations have been rounded):

C(n,r)
n - r - r + m
n - r
× C(r,m) × C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
47 - 6 - 6 + 3
47 - 6
× C(6,3) × C(47-6,6-3)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 3 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
47 - 6 - 6 + 3
47 - 6
×
6!
3! × (6 - 3)!
×
41!
3! × (41 - 3)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,3) = 6! ÷ (3! × (6-3)!)
C(47-6,6-3) = 41! ÷ (3! × (41-3)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
0.9268 × 20 × 10,660
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
(47-6-6+3) ÷ (47-6) = 0.0732
6! ÷ (3! × (6-3)!) = 20
41! ÷ (3! × (41-3)!) = 10,660
10,737,573 = 54.340
197,600
Calculate:
10,737,573 ÷ (0.9268 × 20 × 10,660) = 54.340
2 Main Numbers + Bonus Ball 1 in 72.453 Show/Hide ›

The odds for this prize level are directly influenced by the Bonus Ball. Since the Bonus Ball is drawn from the same pool as the main numbers, the following formula is used (Please note: calculations have been rounded):

C(n,r)
r - m
n - r
× C(r,m) × C(n-r,r-m)
C(n,r) = Odds of correctly choosing r balls from n
n = Number of balls in the main pool
r = Balls drawn from the main pool
m = Balls to be matched from the main pool
C(47,6)
6 - 2
47 - 6
× C(6,2) × C(47-6,6-2)
Substitute:
n for 47 (number of balls in the main pool)
r for 6 (balls drawn from the main pool)
m for 2 (balls to be matched from the main pool)
47!
6! × (47 - 6)!
6 - 2
47 - 6
×
6!
2! × (6 - 2)!
×
41!
4! × (41 - 4)!
Expand:
C(47,6) = 47! ÷ (6! × (47-6)!)
C(6,2) = 6! ÷ (2! × (6-2)!)
C(47-6,6-2) = 41! ÷ (4! × (41-4)!)
! means 'Factorial' eg: 47! = 47 × 46 × 45 ... × 1
Note: 0! = 1
10,737,573
0.0976 × 15 × 101,270
Simplify:
47! ÷ (6! × (47-6)!) = 10,737,573
(6-2) ÷ (47-6) = 0.0976
6! ÷ (2! × (6-2)!) = 15
41! ÷ (4! × (41-4)!) = 101,270
10,737,573 = 72.453
148,200
Calculate:
10,737,573 ÷ (0.0976 × 15 × 101,270) = 72.453

Overall Odds: 1 in 28.714

Please note, some lotteries have irregular prize levels, therefore the odds calculated may not be 100% accurate.


How to use the Lotto Odds Calculator


  1. Enter the number of balls to be drawn
  2. Enter the total number of balls from which these are drawn
  3. Choose the total number of prize levels the lottery has, eg: Match 6, Match 5, Match 4 and Match 3 would be 4 levels
  4. If the lottery includes 'bonus' numbers eg: a Powerball, tick the "include bonus balls" box
  5. If the box has been ticked, a dropdown menu will appear in a similar style to the original fields. Enter the number of 'bonus' numbers to be drawn, the size of the pool it/they are drawn from, and the amount of prize levels that involve matching the bonus number. Finally, select the name of the bonus number from the remaining dropdown box
  6. Click the "Calculate Odds" button to view the odds, or to start again, click Reset.

Alternatively you can choose a lottery from the "Popular Lotteries" dropdown menu at the bottom of the form to quickly input the variables for your chosen lottery and auto-display the odds table.

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