🏃 Health & Fitness
Pregnancy Due Date Calculator
Naegele’s rule adds 280 days to the first day of your last menstrual period. Only about four in a hundred babies arrive exactly on the estimated date, so treat it as the centre of a window rather than a fixed appointment.
How it works
First day of last period
Average cycle length
Estimated due date
Estimated conception
Second trimester begins
Third trimester begins
Days pregnant today
Weeks pregnant today
Frequently asked questions
How do I use the Pregnancy Due Date Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.