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Pregnancy Calculator

Estimate due date and gestational age from the last period

About this tool and FAQ+

What is "Pregnancy Calculator"?

"Pregnancy Calculator" provides an indicative calculation: estimate due date and gestational age from the last period. It is intended for adults and does not diagnose a condition.

How to use

Complete only the visible fields and press the primary action. The result appears below with the method assumptions and limitations.

Features of "Pregnancy Calculator"

  • Formula and result boundaries shown in the interface
  • Parameters considered: Pregnancy Calculator
  • Less common parameters in additional settings
  • A general estimate rather than a diagnosis
When this tool helps

When to use

"Pregnancy Calculator" can be used for a quick reference calculation before discussing an individual situation with a qualified professional.

Advantages of the online version

The tool separates inputs, output and assumptions. It does not replace a clinician, examination or personalized medical recommendation.

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Made in rc-web.kz

Use the date the bleeding started, not the date it ended.

The estimated due date, gestational age and trimester will appear here.
Advanced settingsCycle-length adjustment and official methodology

Default: 28 days. This setting only shifts the estimated due date by the difference from 28 days.

The calculator does not reinterpret ultrasound measurements. Clinical dating uses the LMP, an early accurate ultrasound, or both, with changes documented by a clinician.

Official ACOG sources

  • ACOG: how the estimated due date is determined
  • ACOG: methods for estimating the due date

Sources checked July 11, 2026.