Terms of use
Plain-language terms for using this site.
Information, not medical advice
This site provides general information and date calculations for planning. It is not medical advice, diagnosis or treatment, and it doesn’t create a relationship with a healthcare provider. Always follow the advice of your midwife, doctor or fertility clinic, and use the due date they give you. If you think you may have a medical emergency, call 911 (US), 999 (UK) or your local emergency number.
Estimates only
Every result is an estimate based on what you enter and on published conventions. Results can be wrong if inputs are wrong, and even correct calculations can’t predict when a baby will be born.
Provided as is
We work hard to keep the calculations and content accurate and up to date, but the site is provided “as is”, without warranties of any kind. To the extent the law allows, Variable Ratio is not liable for decisions made based on the site.
Using the content
You are welcome to use the calculator for personal use and to link to any page. Please don’t copy the site’s text or illustrations wholesale without permission.
Changes
We may update these terms. The current version is always on this page.
Contact
Questions: hello@pregnancyduedatecalculator.com.
Last updated November 12, 2026.