Change the inputs in the grey fields to see how it affects the position size and risk as the account grows. Based on the "fixed ratio model" proposed by Ryan Jones in "The Trading Game."
starting account size:						$ 10,000
margin required per contract:						$   2,000
delta (increase per contract required to add 1 contract):						$   1,000
maximum stoploss per contract per transaction:						$       55
worst foreseeable number of bad trades:						10
number of contracts to trade	required margin	account threshold to add 1 contract	max  expected drawdown$	max  expected drawdown%
1	2,000	11,000	550	6%
2	4,000	13,000	1,100	10%
3	6,000	16,000	1,650	13%
4	8,000	20,000	2,200	14%
5	10,000	25,000	2,750	14%
6	12,000	31,000	3,300	13%
7	14,000	38,000	3,850	12%
8	16,000	46,000	4,400	12%
9	18,000	55,000	4,950	11%
10	20,000	65,000	5,500	10%
11	22,000	76,000	6,050	9%
12	24,000	88,000	6,600	9%
13	26,000	101,000	7,150	8%
14	28,000	115,000	7,700	8%
15	30,000	130,000	8,250	7%
16	32,000	146,000	8,800	7%
17	34,000	163,000	9,350	6%
18	36,000	181,000	9,900	6%
19	38,000	200,000	10,450	6%
20	40,000	220,000	11,000	6%
21	42,000	241,000	11,550	5%
22	44,000	263,000	12,100	5%
23	46,000	286,000	12,650	5%
24	48,000	310,000	13,200	5%
25	50,000	335,000	13,750	4%
26	52,000	361,000	14,300	4%
27	54,000	388,000	14,850	4%
28	56,000	416,000	15,400	4%
29	58,000	445,000	15,950	4%
30	60,000	475,000	16,500	4%
31	62,000	506,000	17,050	4%
32	64,000	538,000	17,600	3%
33	66,000	571,000	18,150	3%
34	68,000	605,000	18,700	3%
35	70,000	640,000	19,250	3%
36	72,000	676,000	19,800	3%
37	74,000	713,000	20,350	3%
38	76,000	751,000	20,900	3%
39	78,000	790,000	21,450	3%
40	80,000	830,000	22,000	3%
41	82,000	871,000	22,550	3%
42	84,000	913,000	23,100	3%
43	86,000	956,000	23,650	3%
44	88,000	1,000,000	24,200	3%
45	90,000	1,045,000	24,750	2%
46	92,000	1,091,000	25,300	2%
47	94,000	1,138,000	25,850	2%
48	96,000	1,186,000	26,400	2%
49	98,000	1,235,000	26,950	2%
50	100,000	1,285,000	27,500	2%