The accuracy of the dates below depends on the accuracy of your last menstrual period. Your “Last Menstrual Date” may not be compatible with your gestational week due to reasons such as wrong remembering, delayed ovulation date (cycles lasting less than 28 days or longer), irregular menstruation, “oversight”. Therefore, in order to determine the compatibility of your last menstrual period with your gestational week, your last menstrual period should be confirmed by an ultrasonography preferably performed in the first trimester.

Your Last Menstrual Date
Day Month Year
Weeks (End Dates) Dates Lower Boundary Middle Top Boundary
1.Week

     
2.Week

  Ovulation  
3.Week

  İmplantasyon  
4.Week

  -  
5.Week

  -  
6.Week

  -  
7.Week

  1  
8.Week

  2  
9.Week

  4  
10.Week

  6  
11.Week

  8  
12.Week

  14  
13.Week

  26  
14.Week

  45  
15.Week

  74  
16.Week

  110  
17.Week

  150  
18.hafta

  210  
19.Week

  280  
20.Week

  320  
21.Week

  400  
22.Week

  470  
23.Week

  550  
24.Week

  640  
25.Week

  790  
26.Week

550 820 1330
27.Week

650 960 1500
28.Week

750 1050 1680
29.Week

900 1300 1900
30.Week

1000 1400 2080
31.Week

1180 1650 2350
32.Week

1300 1780 2500
33.Week

1480 2000 2750
34.Week

1680 2200 2930
35.Week

1850 2490 3200
36.Week

2080 2700 3330
37.Week

2250 2850 3500
38.Week

2500 2950 3650
39.Week

2650 3200 3800
40.Week

2770 3350 3900
42.Week

2890 3450 4050

Fetal weights in the table are given in grams (g). These rates are average values based on researches, they are not certain and binding!