Deadline Calculator
Plan due dates by adding calendar or business days to a kickoff date. Perfect for project managers, freelancers, or students.
Set to zero if you only need to add hours.
Handy for partial days, review buffers, or timezone hand-offs.
Deadline
Due on
Fri, January 16, 2026
at 09:00 AM
Calendar days added: 6
Business days counted: 5
Weekend skipping: Enabled
How to Use This Calculator
Set the kickoff moment
Choose the date and time the work begins—project start, contract signature, or ticket creation.
Add required lead time
Enter the number of days and hours you need to complete the task or deliverable.
Decide on business vs. calendar days
Toggle weekend skipping if your business runs Monday through Friday. Disable for 24/7 operations.
Formula
Deadline = Start Date + Days + (Hours ÷ 24)
Business Days: skip Saturdays (6) and Sundays (0) while counting forward.
Example: Start Monday 09:00, add 5 business days and 3 hours → Friday 12:00 the following week (skipping the weekend in between).
Why Deadline Planning Matters
Clear deadlines keep projects on track, align collaborators, and set realistic expectations. This calculator removes mental math from scheduling so you can focus on execution.
- Know when to schedule check-ins and client updates.
- Anticipate handoffs between teams by including buffer hours.
- Communicate due dates in a consistent format across time zones.
Frequently Asked Questions
Does this adjust for holidays?
Not automatically. Add extra days manually for company shutdowns or vacations, or adjust the start date to account for the break.
How do I handle different time zones?
Pick the timezone of the responsible team and share the result with both local and target timezone context when communicating.
Can I subtract time to find the start date?
Yes—enter the known due date as the start and add negative hours or days to work backwards, or simply subtract manually before inputting.
What if the project spans multiple milestones?
Run the calculator for each phase or sprint to build a milestone timeline and ensure buffers between deliverables.