Frequently Asked Questions
How does the Due Date Calculator work?
Our Due Date Calculator estimates your delivery date based on the first day of your last menstrual period (LMP) or ultrasound measurements. By standard methodology, it adds approximately 280 days (40 weeks) to your LMP.
Are these pregnancy calculators free to use?
Yes, absolutely! Every ovulation predictor, conception calculator, due date estimator, and contractions timer on myfavcalculator is 100% free with no registration requirements or hidden costs.
Do you store my personal health data?
Absolutely not. We deeply respect user privacy, especially concerning health data. All calculations and estimations are performed locally on your own device inside your browser. We never save, view, or transmit your cycle lengths or medical info.
What exactly is the "fertility window"?
Your fertility window refers to the days during a woman's menstrual cycle when pregnancy is possible. It typically spans the five days leading up to ovulation and the day of ovulation itself. Our Fertility and Ovulation Calculators are designed to help you pinpoint these dates efficiently.
Can I use these tools on my smartphone?
Yes! Our platform features a highly responsive, liquid-grid design that ensures perfect usability and interaction on any mobile phone, tablet, or desktop.