Due Date Calculator

This intuitive digital tool takes the first day of your last menstrual period and your average cycle length as the main input. Using a standard medical model of about 280 days of gestation, it gives you an estimated, easy-to-read result and a simple pregnancy calendar that helps you track how far along you are.

The first day of your last menstrual period is what doctors use to determine how many weeks into pregnancy you are, even though actual conception and ovulation happen later. Entering this date lets the calculator provide a more accurate, clinically-aligned starting point for your expected delivery window.

Average cycle length is the number of days from the start of one period to the start of the next. Changing this setting helps the calculator adjust your gestational timeline in a more personalized way, so the result better reflects your natural ovulation pattern and expected baby arrival.

Yes. You can enter any typical cycle length (for example 25 or 32 days) and the due date tool will calculate a customized schedule for your pregnancy. This makes the estimate more reliable, especially if you know your ovulation tends to be earlier or later than average.

Every due date is an estimated prediction, not a guarantee of the exact delivery day. This online tool uses widely accepted medical guidelines, so it offers a helpful and reasonably accurate guide to your baby’s timeframe, but your doctor and ultrasound scans will always give the most precise clinical information.

Gestational age is the length of the pregnancy in weeks and days, and each trimester is a phase within that schedule. Based on your data, the calculator can estimate your current gestation, show which trimester you’re in, and act as an informative pregnancy calendar that helps you monitor how your fetus is developing week by week.

If you’re unsure, you can select the closest date you remember. The due date calculator will still give a useful, informative result, but you should treat it as approximate. For more reliable dating, your doctor may recommend an ultrasound to better determine how far along you are.

The tool can’t pinpoint the exact day of conception, but it can predict a likely window. In most cases, conception happens around ovulation, roughly 11–21 days after the first day of your last period, depending on your cycle. You can use the estimated due date and gestational age as a guide to find that likely timeframe.

This free, easy-to-use digital tool is designed mainly for single, naturally conceived pregnancies with relatively regular cycles. If you conceived through IVF, are expecting multiples, or have conditions that affect gestation, your doctor may use more specialized medical methods, ultrasound measurements, and a different schedule to calculate your expected delivery date.

No. The due date calculator is a helpful, informative guide for a mother who wants to check her expected timeline and track her pregnancy. It is not a substitute for professional care. Always follow the advice of your healthcare provider, who can support you with personalized medical assessments, ultrasound scans, and a detailed birth schedule tailored to you and your baby.