Pregnancy Due Date Calculator
Estimate your due date from the first day of your last period.
Pregnancy Due Date Calculator
Estimate your due date from the first day of your last period.
Estimate only, using Naegele's rule (280 days from LMP). Always confirm with your doctor.
Features
- Uses Naegele's rule (280 days from LMP)
- Shows current weeks and days pregnant
- Simple single-input calculation
- 100% free, no signup
How to Use
Enter the first day of your last period.
Click Calculate Due Date.
See your estimated due date and current progress.
About This Tool
Pregnancy Due Date Calculator estimates your expected due date using Naegele's rule, based on the first day of your last menstrual period, and shows how far along you currently are.
Frequently Asked Questions
It is a standard clinical estimate, but only about 5% of babies arrive exactly on their due date — always confirm timing with your doctor.
This method assumes a fairly standard cycle length; an irregular cycle may make an ultrasound-based estimate more reliable.