Kelly Stakes Calculator

The following tables may be used to calculate a Kelly stake as a percentage of your betting bank. It should be noted that many people prefer to use a percentage of this figure, as Kelly staking is very aggressive and doesn't account for several bets riding at the same time, i.e. it assumes that each bet is settled before the next one is placed.10%-50% of the recommended Kelly stakes will suit most needs.
To use the tables below, you need two figures

• The bookies percentage (the inverse of the decimal odds), which you may use the conversion table here.
• Your estimate of the true chance, which you may calculate from your estimate of the 'fair odds' using the conversion table here.

To use the table, read across the table using the bookies percentage and down the table using your estimate of the fair chance, e.g. with a bookies percentage of 65% and a fair chance of 70% your Kelly stake is 14% of your bank.
A negative percentage indicates that you shouldn't back at these odds - in fact it indicates what amount a layer could risk against you!

Bookies Percentage
	95	90	85	80	75	70	65	60	55	50
95	0%	50%	67%	75%	80%	83%	86%	88%	89%	90%
90	-100%	0%	33%	50%	60%	67%	71%	75%	78%	80%
85	-200%	-50%	0%	25%	40%	50%	57%	63%	67%	70%
80	-300%	-100%	-33%	0%	20%	33%	43%	50%	56%	60%
75	-400%	-150%	-67%	-25%	0%	17%	29%	38%	44%	50%
70	-500%	-200%	-100%	-50%	-20%	0%	14%	25%	33%	40%
65	-600%	-250%	-133%	-75%	-40%	-17%	0%	13%	22%	30%
60	-700%	-300%	-167%	-100%	-60%	-33%	-14%	0%	11%	20%
55	-800%	-350%	-200%	-125%	-80%	-50%	-29%	-13%	0%	10%
50	-900%	-400%	-233%	-150%	-100%	-67%	-43%	-25%	-11%	0%
45	-1000%	-450%	-267%	-175%	-120%	-83%	-57%	-38%	-22%	-10%
40	-1100%	-500%	-300%	-200%	-140%	-100%	-71%	-50%	-33%	-20%
35	-1200%	-550%	-333%	-225%	-160%	-117%	-86%	-63%	-44%	-30%
30	-1300%	-600%	-367%	-250%	-180%	-133%	-100%	-75%	-56%	-40%
25	-1400%	-650%	-400%	-275%	-200%	-150%	-114%	-88%	-67%	-50%
20	-1500%	-700%	-433%	-300%	-220%	-167%	-129%	-100%	-78%	-60%
15	-1600%	-750%	-467%	-325%	-240%	-183%	-143%	-113%	-89%	-70%
10	-1700%	-800%	-500%	-350%	-260%	-200%	-157%	-125%	-100%	-80%
5	-1800%	-850%	-533%	-375%	-280%	-217%	-171%	-138%	-111%	-90%

Bookies Percentage
	45	40	35	30	25	20	15	10	5
95	91%	92%	92%	93%	93%	94%	94%	94%	95%
90	82%	83%	85%	86%	87%	88%	88%	89%	89%
85	73%	75%	77%	79%	80%	81%	82%	83%	84%
80	64%	67%	69%	71%	73%	75%	76%	78%	79%
75	55%	58%	62%	64%	67%	69%	71%	72%	74%
70	45%	50%	54%	57%	60%	63%	65%	67%	68%
65	36%	42%	46%	50%	53%	56%	59%	61%	63%
60	27%	33%	38%	43%	47%	50%	53%	56%	58%
55	18%	25%	31%	36%	40%	44%	47%	50%	53%
50	9%	17%	23%	29%	33%	38%	41%	44%	47%
45	0%	8%	15%	21%	27%	31%	35%	39%	42%
40	-9%	0%	8%	14%	20%	25%	29%	33%	37%
35	-18%	-8%	0%	7%	13%	19%	24%	28%	32%
30	-27%	-17%	-8%	0%	7%	13%	18%	22%	26%
25	-36%	-25%	-15%	-7%	0%	6%	12%	17%	21%
20	-45%	-33%	-23%	-14%	-7%	0%	6%	11%	16%
15	-55%	-42%	-31%	-21%	-13%	-6%	0%	6%	11%
10	-64%	-50%	-38%	-29%	-20%	-13%	-6%	0%	5%
5	-73%	-58%	-46%	-36%	-27%	-19%	-12%	-6%	0%