# Due Date Calculator

Calculate pregnancy due date based on last period or conception date

> Canonical page: https://elysiatools.com/en/tools/due-date-calculator

- **Category:** Health

- **Keywords:** pregnancy, due date, calculator, baby, conception, last period, gestational, due date calculator

## Overview

The Due Date Calculator provides a quick and accurate estimate of your expected delivery date based on standard medical pregnancy timelines. By inputting the first day of your last menstrual period or your known conception date, you can easily track your pregnancy progress and prepare for upcoming milestones.

## Inputs

- **Calculation Method** (select)
- **Last Period Date** (date): Select first day of last period
- **Conception Date** (date): Select conception date

## When to use

- Immediately after confirming a positive pregnancy test to establish your estimated timeline.
- When preparing for your first prenatal doctor's appointment and needing to provide an estimated gestational age.
- When planning travel or major life events during your pregnancy to understand your trimester stages.

## How it works

- Select your preferred calculation method: either by the first day of your last period or your specific conception date.
- Enter the corresponding date into the input field using the calendar picker.
- Click calculate to generate your estimated due date and current gestational progress.

## Use cases

- Expectant parents planning their maternity leave and work schedule.
- Individuals tracking their pregnancy milestones for prenatal health monitoring.
- Families organizing baby showers and preparations based on the estimated delivery window.

## Frequently asked questions

### How accurate is this due date calculator?

This tool provides an estimate based on standard 40-week pregnancy cycles. Only a healthcare provider can confirm an exact due date via ultrasound.

### Should I use the last period or conception date?

The first day of your last period is the standard medical method. Use the conception date only if you are certain of the exact day fertilization occurred.

### Does this tool account for irregular cycles?

The calculator assumes a standard 28-day cycle. If your cycles are irregular, your doctor may adjust the due date based on clinical examination.

### Is my data stored or shared?

No, this tool processes your input locally and does not store or share your personal health information.

### Can this tool predict the exact day of birth?

No. Only about 5% of babies are born exactly on their estimated due date; it is intended as a guide for prenatal care.

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## Samples

- [Android Date & Time Java Samples](https://elysiatools.com/en/samples/android-datetime-java): Android Java date and time examples including getting current time, formatting dates, and parsing date strings
- [Android Date & Time Kotlin Samples](https://elysiatools.com/en/samples/android-datetime-kotlin): Android Kotlin date and time examples including getting current time, formatting dates, and parsing date strings
- [Date & Time Samples](https://elysiatools.com/en/samples/date-time): Collection of date and time strings in various formats for validation testing
- [macOS Date Time Objective-C Samples](https://elysiatools.com/en/samples/macos-datetime-objectivec): macOS Objective-C date and time examples including NSDate, NSDateFormatter, NSCalendar, and time intervals