If they're standard size this is a table I would use:
http://edis.ifas.ufl.edu/ps046
Table 2.
Example of target body weights during the rearing of replacement pullets.
Age
(weeks)
Body weight
(Pounds)
(Grams)
1
0.14
65
2
0.24
110
3
0.40
180
4
0.55
250
5
0.71
320
6
0.88
400
7
1.10
500
8
1.28
580
9
1.50
680
10
1.70
770
11
1.92
870
12
2.09
950
13
2.27
1030
14
2.43
1100
15
2.56
1160
16
2.67
1210
17
2.76
1250
18
2.82
1280
19
2.89
1310
20
3.00
1360
-Kathy
http://edis.ifas.ufl.edu/ps046
Table 2.
Example of target body weights during the rearing of replacement pullets.
Age
(weeks)
Body weight
(Pounds)
(Grams)
1
0.14
65
2
0.24
110
3
0.40
180
4
0.55
250
5
0.71
320
6
0.88
400
7
1.10
500
8
1.28
580
9
1.50
680
10
1.70
770
11
1.92
870
12
2.09
950
13
2.27
1030
14
2.43
1100
15
2.56
1160
16
2.67
1210
17
2.76
1250
18
2.82
1280
19
2.89
1310
20
3.00
1360
-Kathy