Pregnancy Due Date Calculator
Calculate estimated due date using the first day of your last menstrual period.
Estimate baby due date from last period.
How to use
- Enter the first day of your last menstrual period.
- Confirm cycle length if the tool asks.
- View the estimated due date.
- Note this is an estimate — ultrasound dating may differ.
About Pregnancy Due Date Calculator
Estimate baby due date from last period.
Runs in your browser — your files and input stay on your device.
Frequently asked questions
Is this a medical diagnosis?
No. Always confirm dates with your healthcare provider.
Is my data stored?
No.
What if my cycles are irregular?
Estimates are less accurate with irregular cycles; clinical dating is preferred.