Terms of Use

Last updated: 27 October 2026.

Estimates, not medical advice

DueDateCalc provides date estimates for general information only. It is not a medical service, does not diagnose or treat anything, and does not replace professional care. Estimated due dates are statistical averages; only around 5% of babies arrive on the estimated day. Ultrasound dating and guidance from your own healthcare provider take precedence over anything on this site. If you have concerns about a pregnancy, contact a qualified clinician promptly.

Use of the site

The calculators are free for personal use. You may link to any page. Automated scraping that degrades the service, and presenting this site's estimates as certified medical determinations, are not permitted.

Accuracy

The formulas used are the standard published methods (Naegele's rule with cycle adjustment; conception + 266 days; ultrasound remaining-days), applied as described on each page. We work to keep the arithmetic correct but give no warranty that any estimate fits your individual circumstances.

Liability

To the extent permitted by law, DueDateCalc and its operator are not liable for decisions made in reliance on these estimates. Always confirm dates, screening windows and care plans with your healthcare provider.