Crown-rump length (CRL) calculator
Crown-rump length (CRL) chart.
CRL
– Crown-rump length.
Calculator
Gestational age
(GA)
4w
5w
6w
7w
8w
9w
10w
11w
12w
13w
14w
15w
1d
2d
3d
4d
5d
6d
CRL
Crown-rump length
, mm
Multiple Pregnancy
?
Singleton
Twins
Triplets
Transvaginal ultrasound
< 5w1d
-
Thickened endometrium
< 5w1d
-
Corpus luteum
5w1d-5w5d
-
Gestational sac
5w5d-6w0d
-
Yolk sac
6w0d
-
Fetal pole
6w0d
-
Fetal heart rate
#
CRL
Crown-rump length
