Table 4: The Monash Chart. CRL reference table based on true gestational age in an IVF cohort.

CRL (mm)GA (wks, days)GA (days)

1.0 mm6W1D42.9
1.5 mm6W1D43.3
2.0 mm6W2D43.7
2.5 mm6W2D44.1
3.0 mm6W3D44.5
3.5 mm6W3D45.0
4.0 mm6W3D45.4
4.5 mm6W4D45.8
5.0 mm6W4D46.2
5.5 mm6W5D46.6
6.0 mm6W5D47.0
6.5 mm6W5D47.4
7.0 mm6W6D47.8
7.5 mm6W6D48.2
8.0 mm7W0D48.6
8.5 mm7W0D49.1
9.0 mm7W0D49.5
9.5 mm7W1D49.9
10.0 mm7W1D50.3
10.5 mm7W2D50.7
11.0 mm7W2D51.1
11.5 mm7W3D51.5
12.0 mm7W3D51.9
12.5 mm7W3D52.3
13.0 mm7W4D52.7
13.5 mm7W4D53.2
14.0 mm7W5D53.6
14.5 mm7W5D54.0
15.0 mm7W5D54.4
15.5 mm7W6D54.8
16.0 mm7W6D55.2
16.5 mm8W0D55.6
17.0 mm8W0D56.0
17.5 mm8W0D56.4
18.0 mm8W1D56.8
18.5 mm8W1D57.3
19.0 mm8W2D57.7
19.5 mm8W2D58.1
20.0 mm8W2D58.5
20.5 mm8W3D58.9
21.0 mm8W3D59.3
21.5 mm8W4D59.7
22.0 mm8W4D60.1
22.5 mm8W5D60.5
23.0 mm8W5D60.9
23.5 mm8W5D61.4
24.0 mm8W6D61.8
24.5 mm8W6D62.2
25.0 mm9W0D62.6
25.5 mm9W0D63.0
26.0 mm9W0D63.4

GA: gestational age, W: weeks, and D: days.