Category: Health

Due Date Calculator

Estimate your due date and current gestational age from the first day of your last period — supports cycles other than 28 days

💡 Based on Naegele’s rule — pregnancy lasts about 280 days (40 weeks) from the first day of the last period. This is an estimate, not a medical diagnosis.

About Due Date Calculator

Due Date Calculator is a free online tool by HubTools — Estimate your due date and current gestational age from the first day of your last period — supports cycles other than 28 days. Use it instantly in your browser: no installation, no signup.

Privacy matters — this tool runs 100% in your browser. Your files and data are never uploaded to any server; close the tab and everything is gone.

How to use Due Date Calculator

  1. 1

    Enter your details such as weight, height, age, or an important date

  2. 2

    Choose the options that match your situation, such as your weekly activity level

  3. 3

    Click calculate to see the result and all related values

  4. 4

    Use the result to adjust your routine, and consult a professional for further advice

Frequently Asked Questions

Is Due Date Calculator free to use?

Yes. Due Date Calculator by HubTools is 100% free, with no signup and no usage limits.

Will my files be uploaded to a server?

No — Due Date Calculator runs entirely in your browser. Your files and data are never uploaded to any server.

Do I need an account to use it?

No account required. Just open the page and start using it immediately — no personal information needed.