# Pregnancy due date calculator

Canonical page: https://nepocore.com/tools/due-date/

Estimate a due date from the first day of the last period. This browser tool shows the inputs, assumptions and resulting output so you can use it for a specific everyday task.

## How to use it

1. Enter your own values or choose a supported file.
2. Adjust the options and run the tool.
3. Review the result, then copy, export or save it when available.

## Example

Use the first day of the last period and an assumed regular cycle length to estimate a due date.

## Limits and checks

This is a date estimate, not confirmation of pregnancy. Clinical assessment and ultrasound may give more accurate dating.

## Access and processing

Free to use without an account. Interactive processing requires JavaScript in a modern browser. Input is processed in the browser rather than sent to a processing server. Optional browser storage is not a synchronized account.

## Method and sources

- [NHS — estimated due date and dating scans](https://www.nhs.uk/pregnancy/finding-out/due-date-calculator/)

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