Calculate future dates by adding a specific number of days to any starting date. Perfect for project planning, countdowns, scheduling, and date math.
Your project starts on June 1, 2026 and you have a 45-day timeline to complete it.
Result Date: July 16, 2026
Adding 45 calendar days to June 1 gives you July 16. That's about 6 weeks and 3 days for your project.
Today is May 14, 2026. You want to know what date is 90 days from now.
Result Date: August 12, 2026
90 days from today lands in mid-August. That's approximately 3 months or 12 weeks and 6 days away.
You're booking a 14-day vacation starting September 1, 2026. When does it end?
Result Date: September 15, 2026
A 14-day vacation from September 1 ends on September 15, giving you exactly 2 weeks away.
A contract has a 10 business day review period starting June 1, 2026 (a Monday).
Result Date (weekdays only): June 12, 2026 (Friday)
10 business days from a Monday is 2 full work weeks, ending on the following Friday, June 12. Weekends (June 6-7) are skipped.
You can subtract days by entering a negative number. Great for finding dates in the past.
Use the "Weekdays only" option to skip Saturdays and Sundays — perfect for business deadlines and work scheduling.
Our calculator automatically accounts for leap years (February 29) when adding days across year boundaries.
See your result broken down into weeks and months to better understand the time span at a glance.
The Add Days Calculator is a simple yet powerful tool that lets you calculate exact future or past dates by adding or subtracting a specific number of days from any starting date. Whether you're planning a project timeline, counting down to an event, or need to know what date falls 90 days from today, this calculator handles all the date math automatically — accounting for month lengths, leap years, and even optional weekday-only calculations.
Date arithmetic is more complex than it seems. Months have different lengths, leap years add an extra day every four years, and counting only business days requires skipping weekends. Our calculator handles all of these complexities so you can focus on planning, not counting days on a calendar.
Manual date calculation is error-prone and time-consuming, especially over long periods. This calculator eliminates mistakes and gives you instant, accurate results with a clear breakdown. Whether you're a project manager setting deadlines, a traveler planning an itinerary, or someone tracking a personal goal, this tool makes date math effortless. You also get the day of the week for the result date, plus a duration breakdown in weeks and months for better context.
The Add Days Calculator is incredibly versatile and useful in countless real-world scenarios. Here are some of the most common applications:
Calculate project milestones, deadlines, and sprint end dates. Use weekdays-only mode for accurate business day estimates.
Determine exact return dates, plan multi-stop itineraries, and calculate how many days until your next trip.
Calculate business-day deadlines for contract reviews, response periods, and filing dates that exclude weekends.
Set 30-day challenges, 90-day fitness plans, or 365-day countdowns. Know exactly when your goal period ends.
Calculate assignment due dates, exam countdowns, and semester end dates for better academic scheduling.
Track billing cycles, grace periods, and payment due dates. Calculate exactly when payments are due.
⚠️ Important Note: While our Add Days Calculator provides accurate date calculations, always verify critical dates — especially for legal contracts, court filings, financial deadlines, or medical appointments. Different jurisdictions may have specific rules about business day counting (e.g., excluding holidays), and this calculator counts only standard weekdays.