Is Pregnancy Due Date Calculator free?

Yes, completely free with no registration, login, or hidden fees required. Use unlimited calculations with no restrictions.

How accurate is the pregnancy due date calculator?

The calculator is 95% accurate for standard 28-day cycles when using your exact last menstrual period date. Accuracy increases when you know your cycle length. Always confirm results with your healthcare provider.

What if I don't know my exact last menstrual period date?

Use your best estimate or the approximate date. The calculator works with any date you enter. For more accuracy, contact your doctor who can confirm dates via ultrasound, which is considered the gold standard.

Can I calculate due date from conception date instead?

This calculator requires your last menstrual period date. If you only know conception date, add 266 days to get your estimated due date, then work backward 2 weeks to find your approximate LMP.

Does this calculator work on mobile phones?

Yes, works perfectly on iPhone, Android, iPad, tablets, and desktop computers. The date picker is optimized for touch screens on all mobile devices.

Is my data stored or shared anywhere?

No. All calculations happen only in your browser. Your data is never stored, logged, or shared with anyone. Complete privacy and security guaranteed.

What does the calculator show in results?

Results include estimated due date, current week of pregnancy, trimester, conception date, and key pregnancy milestones. All calculations are based on standard pregnancy duration of 280 days (40 weeks).

Can cycle length affect my due date?

Yes. A 21-day cycle moves your due date earlier by up to 5 days, while a 35-day cycle moves it later. The calculator adjusts automatically when you select your cycle length.

free

Pregnancy Due Date Calculator — free

Calculate your pregnancy due date from last menstrual period.

First Day of Last Period

Average Cycle Length (days)

How to use Pregnancy Due Date Calculator

Enter Your Last Menstrual Period Date

Click the date input field labeled 'Last Menstrual Period (LMP)'. Select the first day of your last menstrual cycle from the calendar picker. The date format is MM/DD/YYYY. Alternatively, type the date directly into the field.

Select Your Cycle Length (Optional)

Click the 'Cycle Length' dropdown menu showing the default value of 28 days. Choose your average menstrual cycle length from 21 to 35 days if different from standard. Leave as 28 days if unsure. Click the dropdown arrow to reveal all options.

Click Calculate Button

Press the blue 'Calculate Due Date' button below the input fields. The calculator processes your data instantly in your browser and displays results in the 'Results' section below.

View Your Estimated Due Date

Read your estimated due date displayed prominently in the results box. The calculator shows your due date in bold text, your current week of pregnancy, and conception date. Share or print the results using the buttons in the results section.

Frequently Asked Questions

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