This calculator tells you how far along a pregnancy is by counting weeks from the first day of the last menstrual period, which is the standard clinical way to measure gestational age. Enter the last period date and it reports the current week and day, the trimester you are in, the estimated due date at 40 weeks, and the number of days remaining. Gestational age is expressed as weeks plus days, so 12 weeks and 3 days means you are in your thirteenth week. The first trimester runs to week 13, the second through week 27, and the third to birth. Everything is calculated locally in your browser and no information is uploaded. These dates are estimates based on a typical cycle and can differ from an ultrasound dating scan, so always rely on your healthcare provider for medical guidance and confirmed timing.
It counts from the first day of your last menstrual period, the standard clinical way to date a pregnancy, so week one begins before conception.
The first trimester runs through week 12, the second through week 27 and the third from week 28 to birth.
It estimates the days left to a due date at 40 weeks from your last period.
This calculator tells you how far along a pregnancy is by counting weeks from the first day of the last menstrual period, which is the standard clinical way to measure gestational age. Enter the last period date and it reports the current week and day, the trimester you are in, the estimated due date at 40 weeks, and the number of days remaining.
Yes. Pregnancy Week Calculator is completely free, with no sign-up and no usage limits.
Yes. Pregnancy Week Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Pregnancy Week Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.