Useful Formulae

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Useful Formulae

Quick formulae for odds comparisons and percentage chances

To convert odds into a percentage chance

(2nd part of price/Total of both halves of price) x 100 = percentage chance

Worked example: 6/4

4/10 x 100 = 40%

To convert a decimal price into a percentage chance

(1/decimal price) x 100 = percentage chance

Worked example: 2.50

1/2.50 x 100 = 40%

To convert a percentage chance into a decimal price

100/percentage chance = decimal price

Worked example: 40%

100/40 = 2.50

To convert a percentage chance into odds/1

(100/percentage chance) -1 = odds/1

Worked example: 40%

(100/40) -1 = 1.50/1

Balance your bets and lays with this conversion chart Each line is designed to break even to a total outlay of £100
Back			Lay
Stake £	Odds/1	Decimal	Decimal	Odds/1	Lay £
99	0.01	1.01	100.00	99.00	1
98	0.02	1.02	50.00	49.00	2
97	0.03	1.03	33.33	32.33	3
96	0.04	1.04	25.00	24.00	4
95	0.05	1.05	20.00	19.00	5
94	0.06	1.06	16.67	15.67	6
93	0.08	1.08	14.29	13.29	7
92	0.09	1.09	12.50	11.50	8
91	0.10	1.10	11.11	10.11	9
90	0.11	1.11	10.00	9.00	10
89	0.12	1.12	9.09	8.09	11
88	0.14	1.14	8.33	7.33	12
87	0.15	1.15	7.69	6.69	13
86	0.16	1.16	7.14	6.14	14
85	0.18	1.18	6.67	5.67	15
84	0.19	1.19	6.25	5.25	16
83	0.20	1.20	5.88	4.88	17
82	0.22	1.22	5.56	4.56	18
81	0.23	1.23	5.26	4.26	19
80	0.25	1.25	5.00	4.00	20
79	0.27	1.27	4.76	3.76	21
78	0.28	1.28	4.55	3.55	22
77	0.30	1.30	4.35	3.35	23
76	0.32	1.32	4.17	3.17	24
75	0.33	1.33	4.00	3.00	25
74	0.35	1.35	3.85	2.85	26
73	0.37	1.37	3.70	2.70	27
72	0.39	1.39	3.57	2.57	28
71	0.41	1.41	3.45	2.45	29
70	0.43	1.43	3.33	2.33	30
69	0.45	1.45	3.23	2.23	31
68	0.47	1.47	3.13	2.13	32
67	0.49	1.49	3.03	2.03	33
66	0.52	1.52	2.94	1.94	34
65	0.54	1.54	2.86	1.86	35
64	0.56	1.56	2.78	1.78	36
63	0.59	1.59	2.70	1.70	37
62	0.61	1.61	2.63	1.63	38
61	0.64	1.64	2.56	1.56	39
60	0.67	1.67	2.50	1.50	40
59	0.69	1.69	2.44	1.44	41
58	0.72	1.72	2.38	1.38	42
57	0.75	1.75	2.33	1.33	43
56	0.79	1.79	2.27	1.27	44
55	0.82	1.82	2.22	1.22	45
54	0.85	1.85	2.17	1.17	46
53	0.89	1.89	2.13	1.13	47
52	0.92	1.92	2.08	1.08	48
51	0.96	1.96	2.04	1.04	49
50	1.00	2.00	2.00	1.00	50
49	1.04	2.04	1.96	0.96	51
48	1.08	2.08	1.92	0.92	52
47	1.13	2.13	1.89	0.89	53
46	1.17	2.17	1.85	0.85	54
45	1.22	2.22	1.82	0.82	55
44	1.27	2.27	1.79	0.79	56
43	1.33	2.33	1.75	0.75	57
42	1.38	2.38	1.72	0.72	58
41	1.44	2.44	1.69	0.69	59
40	1.50	2.50	1.67	0.67	60
39	1.56	2.56	1.64	0.64	61
38	1.63	2.63	1.61	0.61	62
37	1.70	2.70	1.59	0.59	63
36	1.78	2.78	1.56	0.56	64
35	1.86	2.86	1.54	0.54	65
34	1.94	2.94	1.52	0.52	66
33	2.03	3.03	1.49	0.49	67
32	2.13	3.13	1.47	0.47	68
31	2.23	3.23	1.45	0.45	69
30	2.33	3.33	1.43	0.43	70
29	2.45	3.45	1.41	0.41	71
28	2.57	3.57	1.39	0.39	72
27	2.70	3.70	1.37	0.37	73
26	2.85	3.85	1.35	0.35	74
25	3.00	4.00	1.33	0.33	75
24	3.17	4.17	1.32	0.32	76
23	3.35	4.35	1.30	0.30	77
22	3.55	4.55	1.28	0.28	78
21	3.76	4.76	1.27	0.27	79
20	4.00	5.00	1.25	0.25	80
19	4.26	5.26	1.23	0.23	81
18	4.56	5.56	1.22	0.22	82
17	4.88	5.88	1.20	0.20	83
16	5.25	6.25	1.19	0.19	84
15	5.67	6.67	1.18	0.18	85
14	6.14	7.14	1.16	0.16	86
13	6.69	7.69	1.15	0.15	87
12	7.33	8.33	1.14	0.14	88
11	8.09	9.09	1.12	0.12	89
10	9.00	10.00	1.11	0.11	90
9	10.11	11.11	1.10	0.10	91
8	11.50	12.50	1.09	0.09	92
7	13.29	14.29	1.08	0.08	93
6	15.67	16.67	1.06	0.06	94
5	19.00	20.00	1.05	0.05	95
4	24.00	25.00	1.04	0.04	96
3	32.33	33.33	1.03	0.03	97
2	49.00	50.00	1.02	0.02	98
1	99.00	100.00	1.01	0.01	99

© 2000 - 2023 Professional Betting Advice and Strategy from cdsystems.

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by Steve Jones

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