Pregnancy Due Date Calculator
Free, private and calculated in your browser
Enter your dating information
Start with the first day of your last menstrual period (LMP). Optional adjustments refine the estimate.
Estimates do not confirm pregnancy or replace prenatal care. Dating can change after clinical assessment.
Your estimated timeline
Estimated due date
April 30, 2027
Estimated gestational age
5w 0d
245 days remaining
Key dates
Week 14
Second trimester begins
October 30, 2026
Week 28
Third trimester begins
February 5, 2027
Week 37
Full term begins
April 9, 2027
Week 40
Estimated due date
April 30, 2027
About this tool
Pregnancy Due Date Calculator is a privacy-first utility designed to finish a small everyday task without an account, remote API or server-side data store. Inputs are processed in the browser and the visible result is available immediately, including when the calculation itself is performed offline.
The interface keeps the important caveats beside the result. Sensor readings are labeled as estimates, dates and financial projections expose their assumptions, and health or travel information includes a clear reminder to confirm decisions with an appropriate professional or official authority.
How to use
Choose a mode
Open the tool and select the measurement, calculation or study mode that matches your task.
Enter local values
Use the labeled inputs and sample values. Permission-based features request access only after you press their start button.
Review the result
Read the result and its limits. Time-sensitive tools use absolute timestamps so background tabs do not create drift.
Export or reset
Copy or download only when needed, and reset the form when you finish on a shared device.
Use cases
Quick personal workflow
Use it for a one-off measurement, conversion, study session or planning estimate without creating a profile.
Offline and private work
Keep notes, values and local records in the current browser session when connectivity or data sharing is undesirable.
Common mistakes
Mistake:Treating an estimate as a certified measurement or official decision.
Fix:Read the tool disclaimer and use calibrated instruments or official sources when accuracy has legal, medical or safety consequences.
Mistake:Leaving sensitive values open on a shared device.
Fix:Export only the information you need, then clear the form or close the private browser session.
Frequently asked questions
Related guides
References & standards
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