Browser-based · No upload · Fast calculation

Pregnancy Due Date Calculator

Estimate pregnancy due date from last period date. This calculator runs locally in your browser.

First day of last menstrual period

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Is my input uploaded?

No. This calculator runs in your browser with local JavaScript.

Are results guaranteed?

Results are estimates for general use. Review calculations before making financial, medical or legal decisions.

Can I copy the result?

Yes. Use the Copy Result button after calculating.