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Pregnancy Due Date Calculator

Estimate due date from last period date.

Runs instantlyCopy individual resultsReset example valuesWorks on mobile

How to use this tool

Enter your values, run the tool, then review the result cards. Most tools update automatically when inputs change, so you can test several scenarios quickly.

Example inputs

Last menstrual period: 2026-01-01

Results this page provides

Estimated due date

How it works

Adds 280 days to the last menstrual period date.

Best use cases

Get a simple due-date estimate for planning.

Limitations

This is not medical advice; confirm pregnancy dates with a clinician.

FAQ

Common questions

Is this tool free?

Yes. It is free and runs as a static browser page.

Can I copy the result?

Yes. Copy all results or copy a single result card.

Does it require an account?

No account is required.

Should I verify important outputs?

Yes. Use this as a practical helper and verify important results before relying on them.