Education tool
Deadline Calculator
Add or subtract calendar days to calculate deadlines, reminders, and follow-up dates.
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How To Use Deadline Calculator
Quick notes to help you understand the result before you act on it.
Overview
Use this deadline calculator to find a due date after a number of calendar days.
You can also subtract days to find a start date or reminder date before a deadline.
Deadline Rule
- Deadline date = start date plus the number of calendar days.
- Subtract mode moves backward by the same number of calendar days.
Practical Tips
- Use the business days calculator when weekends should be excluded.
- Check official deadlines for local holidays, filing rules, and time cutoffs.
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FAQ
Common questions about this tool.
Does this count weekends?
Yes. This calculator uses calendar days, including weekends.
Can I calculate a reminder date before a deadline?
Yes. Enter the deadline as the start date and choose Subtract Days.