Calculate the due date, pregnancy weeks, and trimesters.
The pregnancy calculator calculates the due date based on the start date of the last menstrual period or the ovulation day. The calculator also indicates the current pregnancy week and trimester.
The calculator is completely free, works directly in the browser, and does not store personal information. All calculators on this site are based on up-to-date information.
Due date = last menstrual period + 280 days (Nägele’s rule). Or: ovulation day + 266 days.
Enter your measurements in the calculator fields and press the calculate button – the result will be displayed immediately. You can try different values to compare various scenarios.
Last menstrual period January 15, 2026 → due date October 22, 2026. Today March 20, 2026 → pregnancy week 9+3.
The result is an estimate – for accurate clinical measurements, consult a healthcare professional.
The calculator is suitable for self-monitoring health, planning workouts, and general health literacy. Tracking values over time provides valuable information about changes in the body.
Remember that a single measurement result does not tell the whole story – what matters more is the direction and trend over multiple measurement periods.
Calculate the due date, weeks of pregnancy, and trimesters. Fill in the requested information in the form, and the pregnancy calculator will show the result immediately.
Yes, the pregnancy calculator is completely free and does not require registration. All FiksuLaskuri health calculators are free of charge.
No. The calculations are done entirely in your browser and the data you enter is not sent or stored on the server.
No. The pregnancy calculator is a rough guide, not a medical diagnosis. For health-related decisions, it is advisable to consult a healthcare professional.
Yes – at the bottom of the page, you can see other calculators related to the same topic that may also interest you.