How is my due date calculated?

We use Naegele's rule — 280 days (40 weeks) from the first day of your last menstrual period, or 266 days from conception. If your cycle length differs from 28 days, we adjust the due date accordingly.

Is this a substitute for medical advice?

No. This calculator provides an estimate based on standard formulas. Only about 4% of babies are born on their due date. Always consult a healthcare provider for pregnancy-related decisions.

What's my current trimester?

Pregnancy is split into three trimesters — first (weeks 0–13), second (weeks 14–27), and third (weeks 28–40). The calculator shows your current trimester based on today's date.

Does this store my data?

No. All calculations happen in your browser. Your dates are never sent to or stored on any server.

Pregnancy Calculator

Calculate your due date and track pregnancy progress

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Date

Cycle length (days)28

Frequently Asked Questions

How is my due date calculated?

We use Naegele's rule — 280 days (40 weeks) from the first day of your last menstrual period, or 266 days from conception. If your cycle length differs from 28 days, we adjust the due date accordingly.
Is this a substitute for medical advice?

No. This calculator provides an estimate based on standard formulas. Only about 4% of babies are born on their due date. Always consult a healthcare provider for pregnancy-related decisions.
What's my current trimester?

Pregnancy is split into three trimesters — first (weeks 0–13), second (weeks 14–27), and third (weeks 28–40). The calculator shows your current trimester based on today's date.
Does this store my data?

No. All calculations happen in your browser. Your dates are never sent to or stored on any server.