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Due Date Calculator – Estimates a pregnancy due date from the last me...

The Due Date Calculator estimates a pregnancy due date from the last menstrual period or conception date. This Due Date Calculator uses an established clinical or fitness formula to give you a personalised estimate in seconds. Results are for educational reference — for specific health decisions, discuss with your doctor.

The formula behind this calculator: Adds 280 days (40 weeks) to the first day of the last menstrual period. As a practical example: A last period starting January 1 gives an estimated due date around October 8. All results are calculated instantly in your browser — no data is stored or transmitted.

Due Date Calculator FAQ

What does the Due Date Calculator calculate?

Estimates a pregnancy due date from the last menstrual period or conception date.

Is this a substitute for medical advice?

No. These calculators provide general estimates for educational purposes only. Always consult a doctor or qualified health professional for medical decisions.

Why might my doctor's calculation differ?

Clinical assessments use additional factors, validated instruments, and professional judgement not captured in a general-purpose calculator.

Does this work on mobile?

Yes — fully responsive and optimised for smartphones, tablets, and desktop browsers.