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Due Date Calculator

Estimate a pregnancy due date from LMP or conception date.

Works in your browser

Your result will appear here

Enter your values and choose Calculate. Nothing is uploaded.

Method and formula

Adds 280 days to LMP or 266 days to conception date.

Limitations

Inputs stay in this browser session and are not included in analytics.

Educational estimate only—not a medical diagnosis or clinical recommendation. Pregnancy dates require clinical confirmation.

Privacy by design. This tool processes your work locally in this browser session.

Made for a focused workflow

Due Date Calculator works locally in this browser session, with no account required.

What to expect

  • Clear progress and recoverable errors
  • Explicit file handling and privacy information
  • No fabricated results while an engine is unavailable

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Frequently asked questions

How does Due Date Calculator work?

This tool runs in your browser. Follow the workspace prompts to complete the task.

Do I need an account?

No account is required for the basic browser tools currently available.

What happens to my files?

Files used by this tool stay in your browser for the current session.