Pregnancy Due Date Calculator
Calculate your pregnancy due date from your last period date or your conception date — free online. — free, fast and private.
How to use Pregnancy Due Date Calculator
- Choose whether to calculate from your last period or conception date.
- Pick the date.
- Click Calculate Due Date to see your estimated delivery date.
Note: this tool runs in your browser. Nothing is uploaded.
Disclaimer: this is an estimator only — please see a qualified professional for advice about your specific situation. This is an estimate. Only a doctor or midwife, usually with an ultrasound, can confirm your due date. See a healthcare professional for prenatal care.
Frequently Asked Questions
Is the due date from conception different from LMP?
Yes, by about two weeks. From the last period you add 280 days (40 weeks); from conception you add 266 days (38 weeks), because conception usually happens about 14 days after the last period starts. Both methods should land on the same due date.
Is this tool free to use?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — nothing you enter is uploaded to a server.
Can I use it on my phone?
Yes, it is fully mobile-friendly and works in any modern browser on phone, tablet or computer.