Due Date Calculator estimates pregnancy due dates using either last menstrual period or conception date, providing comprehensive pregnancy timeline information.

The Due Date Calculator API provides a simple, reliable way to integrate due date calculator functionality into your applications. Built for developers who need production-ready due date calculator capabilities without the complexity of building from scratch.

View API Details →

Available on:

async function callDueDateCalculatorAPI() {
    try {
        const params = new URLSearchParams({
            last_period: '2025-06-01'
        });

        const response = await fetch(`https://api.apiverve.com/v1/duedatecalculator?${params}`, {
            method: 'GET',
            headers: {
                'x-api-key': 'YOUR_API_KEY_HERE'
            }
        });

        const data = await response.json();
        console.log(data);
    } catch (error) {
        console.error('Error:', error);
    }
}

callDueDateCalculatorAPI();

curl -X GET "https://api.apiverve.com/v1/duedatecalculator?last_period=2025-06-01" \
  -H "x-api-key: YOUR_API_KEY_HERE"

Get your API key: https://apiverve.com

📁 For more examples, see the examples folder

Choose your preferred programming language:

npm install @apiverve/duedatecalculator

View NPM Package → | Package Code →

dotnet add package APIVerve.API.DueDateCalculator

View NuGet Package → | Package Code →

pip install apiverve-duedatecalculator

View PyPI Package → | Package Code →

gem install apiverve_duedatecalculator

View RubyGems Package → | Package Code →

composer require apiverve/duedatecalculator

View Packagist Package → | Package Code →

dart pub add apiverve_duedatecalculator

View pub.dev Package → | Package Code →

implementation 'com.github.apiverve:duedatecalculator-api:1.0.0'

Package Code →

go get github.com/apiverve/duedatecalculator-api/go

Package Code →

• 🏠 API Home: Due Date Calculator API
• 📚 API Reference: docs.apiverve.com/ref/duedatecalculator
• 📖 OpenAPI Spec: openapi.yaml
• 💡 Examples: examples/

The Due Date Calculator API is commonly used for:

• Web Applications - Add due date calculator features to your frontend or backend
• Mobile Apps - Native SDKs for Android development
• Automation - Integrate with n8n, Zapier, or custom workflows
• SaaS Products - Enhance your product with due date calculator capabilities
• Data Pipelines - Process and analyze data at scale

All requests require an API key in the header:

x-api-key: YOUR_API_KEY_HERE

Get your API key: https://apiverve.com

Every APIVerve endpoint returns the same envelope — check status, then read data:

{
  "status": "ok",
  "error": null,
  "data": { ... }
}

A real response from the Due Date Calculator API:

{
  "status": "ok",
  "error": null,
  "data": {
    "calculation_method": "last_period",
    "last_period_date": "2024-01-01",
    "estimated_conception_date": "2024-01-15",
    "due_date": "2024-10-07",
    "current_progress": {
      "days_pregnant": 715,
      "weeks_pregnant": 102,
      "days_into_week": 1,
      "formatted": "102 weeks, 1 days",
      "trimester": 3,
      "percentage_complete": 255.36
    },
    "time_until_due": {
      "days": 0,
      "weeks": 0,
      "days_extra": 0,
      "formatted": "Past due date",
      "is_overdue": true
    },
    "upcoming_milestones": [],
    "important_dates": {
      "end_first_trimester": "2024-04-01",
      "end_second_trimester": "2024-07-08",
      "full_term_begins": "2024-09-16"
    },
    "disclaimer": "This is an estimate only. Due dates can vary. Consult your healthcare provider for medical advice."
  }
}

• 🏠 API Home: Due Date Calculator API
• 💬 Support: https://apiverve.com/contact
• 🐛 Issues: GitHub Issues
• 📖 Documentation: https://docs.apiverve.com
• 🌐 Website: https://apiverve.com

We welcome contributions! Please see CONTRIBUTING.md for guidelines.

For security concerns, please review our Security Policy.

This project is licensed under the MIT License - see the LICENSE file for details.

Built with ❤️ by APIVerve

Copyright © 2026 APIVerve. All rights reserved.