Due Date Calculator
Calculate the exact due date from any start date and duration in days, weeks, or months. Free online due date calculator for project deadlines, task tracking, and event planning.
About This Calculator
The Due Date Calculator helps you determine exactly when a task, project, invoice, or event is due by adding a specific duration to a start date. Whether you are planning a project timeline, tracking a payment due date, setting a deadline, or counting down to an event, this calculator gives you the precise calendar date and shows how much time remains.
The calculation is straightforward: enter a start date and a duration in days, weeks, or months — the calculator adds the duration to the start date using standard date arithmetic. It automatically handles leap years, varying month lengths, and month-end rollovers (e.g., adding 1 month to January 31 gives February 28 or 29). Results include the due date, days remaining from today, weeks remaining, months remaining, and a visual progress chart showing elapsed versus remaining time.
Regional Notes
India (IN): This calculator is useful for tracking project milestones, invoice due dates, statutory compliance deadlines (GST returns, TDS payments), and contract periods. Common durations include 30-day payment terms, 45-day credit periods, and 90-day project sprints.
United States (US): Use this calculator for contract due dates, invoice terms (Net 30, Net 60, Net 90), project deadlines, subscription periods, and escrow timelines. For working-day calculations, use the Business Days Calculator to exclude weekends.
United Kingdom (UK): Apply this calculator for payment terms, notice periods, project milestones, tenancy dates, and statutory deadlines. Combine with the Working Days Calculator for employment notice periods that exclude weekends and bank holidays.
Frequently Asked Questions
How do I use the Due Date Calculator?
Enter your start date and the duration in days, weeks, or months, then click Calculate. The calculator shows the exact due date, days remaining, and a progress chart.
Can I calculate due dates in weeks or months instead of days?
Yes. Use the duration dropdown to switch between days, weeks, and months. The calculator handles all three units and shows the due date with remaining time in each unit.
Is the Due Date Calculator free to use?
Yes, it is completely free to use with no registration or sign-up required. You can also share your calculation via the URL.
Does the calculator account for weekends and holidays?
No, this calculator adds calendar days. For business-days-only calculations (excluding weekends), use our Business Days Calculator instead.
Can I share my due date calculation results?
Yes. The calculator saves all your inputs in the URL, so you can copy and share the link with colleagues, clients, or team members.
What is the difference between calendar days and business days?
Calendar days include all days of the week (Monday through Sunday). Business days (or working days) exclude weekends and optionally public holidays. This calculator uses calendar days.
How accurate is the due date calculation?
The calculator is 100% accurate for arithmetic date addition. It uses the standard Gregorian calendar and handles leap years and varying month lengths automatically.
Can I calculate multiple due dates at once?
This calculator handles one due date at a time. For batch calculations, adjust the duration field and recalculate as needed. Each result is shareable via URL.