Attendance Days Calculator
Calculate attendance from scheduled weekdays and dated absences. Find how many more attended dates you need to reach a percentage target.
Starts with an editable example. Replace the dates and rules with your own.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
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How to use this calculator
Choose the planning range, the date attendance is recorded through, scheduled weekdays, closures and absences. Set the attendance percentage you want to reach.
Every past scheduled date not marked absent counts as attended. Both range endpoints can count. Future projections assume perfect attendance and keep past absences in the denominator. The entered threshold is compared before display rounding.
A worked example
November 2–6, 2026 has five Monday–Friday dates. One absence gives 4/5, or 80%. Five more attended dates bring the total to 9/10, or 90%, on November 13.
Can more attendance restore a perfect 100%?
Not while a past absence stays in the same cumulative record. Use the actual reporting window and absence policy that apply to you.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results in that range. Daily attendance, office, coverage and chore plans allow up to 366 dates; school cycles, course plans and milestones allow up to 731. Dependency and historical workday calculations scan at most 3,661 dates. Class-session searches allow 366 dates and 200 sessions. Time-zone tools use browser IANA rules and require a choice when local times repeat. Dates and policy rules are entered manually; no employer, retailer, school or local weather policy is inferred. Copy, CSV and printing include the calculation rules; calendar exports appear when the result contains dated events.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.