Health Tools

Pregnancy Due Date Calculator

Estimate a due date from the first day of the last menstrual period or a conception date.

Updated April 11, 2026
Free online tool
Planning and research use

Why this page exists

Pregnancy timing questions are easier to follow when the estimate is laid out clearly. This calculator helps visitors estimate a due date from either the first day of the last menstrual period or a conception date and also shows a current pregnancy-week estimate based on today's date in the app environment.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Pregnancy due date calculator

Estimate a due date from the first day of the last menstrual period or from a conception date.

Result

Oct 22, 2026

Estimated due date based on a 280-day pregnancy dated from the first day of the last menstrual period.

Estimated due dateOct 22, 2026

Current pregnancy week13 weeks 1 days

Days remaining188 days

Milestone referenceFirst trimester estimate

Using Jan 15, 2026 as the first day of the last menstrual period points to an estimated due date of Oct 22, 2026.
Based on today's date, the estimate is around 13 weeks 1 days with about 188 days remaining until the due-date estimate.
Pregnancy dating often changes with medical context, cycle timing, or ultrasound information, so use this as a planning estimate only.

This is a standard due-date estimate, not medical advice. Ultrasound findings, cycle length, and clinician guidance can change the due date used in care.

Planning note

Last updated April 11, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Choose whether you want to estimate from the first day of the last menstrual period or from a conception date.

Enter the relevant date for the method you want to use.

The calculator estimates a due date, the current pregnancy week, and a simple milestone reference.

Understanding your result

This is meant to be a planning estimate rather than a clinical answer. It gives a readable due-date reference and a quick week-based view, but real prenatal care may use additional information to confirm or adjust timing.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Estimate from the last menstrual period

This is the standard simple method many people use as an early planning reference.

Estimate from a conception date

If conception timing is clearer than cycle timing, this mode gives a comparable due-date estimate.

Check the current pregnancy-week estimate

The current week result helps visitors connect the due-date estimate with where the pregnancy timeline sits today.

FAQ

Common questions

How is the due date estimated from the last menstrual period?

This calculator uses a standard 280-day estimate from the first day of the last menstrual period.

How is the due date estimated from a conception date?

It uses a standard 266-day estimate from the conception date for a simplified planning result.

Is this medical advice?

No. It is an estimate only, and clinician guidance, ultrasound findings, and cycle timing can all affect the due date used in care.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Health ToolsUpdated April 11, 2026