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Free · Instant · Total Days Calculator
Total Days Calculator
Count the total days between any two dates in seconds. Enter a start date, an end date, and any holidays, and see the total days right away — free, instant, and accurate.
About this tool
What Is a Total Days Calculator?
A total days calculator counts the number of days between two dates. You pick a start date and an end date, and it tells you how many days fall in that period, including both the start date and the end date. If some of those days are holidays, you enter the number of holidays and the calculator subtracts them from the total.
The count is inclusive. A period from 1 September to 30 September 2026 is 30 days, not 29, because both 1 September and 30 September are counted. That is the detail most people get wrong when they count days by hand: they subtract the start date from the end date and forget to add the start day back.
This calculator counts calendar days, including Saturdays and Sundays. It subtracts only the holidays you enter. If you need working days only, add the weekend days in the period to the holidays number, and the result will be the number of working days.
Students use the result to plan a term and to set an attendance target. Once you know the total days, you can enter that number as the total in the Attendance Percentage Calculator, together with the days you attended, to get your attendance percentage for the period.
It is also handy for leave planning. Before you book a trip or take days off, count the days in the period, work out how many you can miss, and check that your plans fit inside that number.
Plan ahead
Why Count Total Days
Counting the days in a term or a month sounds simple, but the number is the starting point for almost every attendance plan. Here is what a correct total lets you do.
- Plan a whole term. Know exactly how many days a term, a semester, or a course block covers before you plan anything else around it.
- Set a real attendance target. A 75% target means nothing without a total. Multiply your total days by 0.75 to find the minimum days you must attend.
- Plan leave without guessing. See how many days you can miss before you book leave, so a holiday never turns into an attendance shortage.
- Check a date range quickly. Count any period in seconds — a month, a term, or the days between two events — without counting on your fingers or a wall calendar.
- Feed the attendance calculator. The total days figure goes straight into the attendance percentage calculator as your total, so your percentage is based on the right number.
Total Days Calculator
Count the Days Between Two Dates
Enter a start date, an end date, and the number of holidays in the period. The calculator counts every day from the start date to the end date, including both dates, then subtracts the holidays.
First day of the period
Last day of the period
Number of non-class days
Getting started
How to Use the Total Days Calculator
Using this total days calculator takes less than a minute. Follow these four steps and you will know exactly how many days your period covers.
- Pick a start date. Choose the first day of the period you want to count, for example the first day of term.
- Pick an end date. Choose the last day of the period. The end date must be on or after the start date, and both dates are counted.
- Enter the holidays. Add up the holidays and non-class days inside the period and enter the total. Enter 0 if there are none. If you want working days only, add the weekend days too.
- Press calculate and read the result. The big number is your total days. The note underneath shows the dates and holidays you entered.
The math
How the Count Works
The calculator runs on one formula. It finds the number of days from the start date to the end date, adds one so both dates are counted, then subtracts the holidays.
Worked example: September 2026
Take 1 September to 30 September 2026, with 2 holidays. From 1 September to 30 September is 29 days apart, so add 1 to count both dates: 30 days in the period. Subtract the 2 holidays, and the total is 28 days.
Worked example: an October block
Take 5 October to 23 October 2026, with 1 holiday. From 5 October to 23 October is 18 days apart, so add 1 to count both dates: 19 days in the period. Subtract the 1 holiday, and the total is 18 days.
| Period | Days in period |
|---|---|
| 1 Sep – 30 Sep 2026 | 30 |
| 5 Oct – 23 Oct 2026 | 19 |
| 12 Jan – 6 Feb 2026 | 26 |
| 2 Mar – 20 Mar 2026 | 19 |
These are calendar days, including Saturdays and Sundays. A period that runs across two months is counted the same way: 12 January to 6 February 2026 is 20 days in January plus 6 days in February, which is 26 days. A period of a single day, where the start and end dates are the same, counts as 1 day.
Worked examples
Total Days for Four Example Periods
Four worked examples, checked with the total days calculator above. The days in the period are counted inclusively, and the total is the days in the period minus the holidays.
| Start date | End date | Days in period | Holidays | Total days |
|---|---|---|---|---|
| 1 Sep 2026 | 30 Sep 2026 | 30 | 2 | 28 |
| 5 Oct 2026 | 23 Oct 2026 | 19 | 1 | 18 |
| 12 Jan 2026 | 6 Feb 2026 | 26 | 3 | 23 |
| 2 Mar 2026 | 20 Mar 2026 | 19 | 0 | 19 |
Once you have the total days, use it to work out your attendance. Read how to calculate attendance percentage to see the next step.
Real schedules
Total Days for Real Schedules
Three students, three situations. Each example uses the same formula, with dates a student might actually plan around.
Example 1 · September term
A September term
Inputs: 1 September to 30 September 2026, 2 holidays.
Working: 30 September minus 1 September is 29 days, plus 1 to count both dates gives 30 days. Subtract 2 holidays.
Answer: 28 days. A 30-day month with 2 holidays leaves 28 days to attend.
Example 2 · October block
An October block
Inputs: 5 October to 23 October 2026, 1 holiday.
Working: 23 October minus 5 October is 18 days, plus 1 to count both dates gives 19 days. Subtract 1 holiday.
Answer: 18 days. A three-week block with 1 holiday leaves 18 days.
Example 3 · Winter term
A winter term
Inputs: 12 January to 6 February 2026, 3 holidays.
Working: 20 days in January (12 to 31) plus 6 days in February (1 to 6) gives 26 days. Subtract 3 holidays.
Answer: 23 days. A term that crosses two months still counts the same way.
Next steps
What to Do With Your Total Days
Your total days figure is the starting point for an attendance plan. Here is how to use it.
- Use it as your total in the attendance calculator. Enter the total days as the total, together with the days you attended, to get your attendance percentage for the period.
- Work out your target days. For a 75% rule, multiply the total by 0.75. For 28 days, that is 21 days: you must attend at least 21 of the 28 days.
- Count the days you can miss. Subtract the target days from the total. For 28 days at a 75% target, you can miss 7 days and still stay at 75%.
- Plan leave against the total. Check every planned holiday or trip against the days you can miss, before you commit to it.
- Recount if the dates change. If the term moves or a holiday is added, run the calculator again with the new dates.
Want to know how many classes those missed days are worth? Read how many classes you can miss to turn your total into a safe number of absences.
Watch out
Common Mistakes When Counting Total Days
- Forgetting the end date is counted. The most common error is subtracting the start date from the end date and stopping there. Always add 1 so both dates are counted.
- Subtracting weekends when the tool does not. This calculator counts Saturdays and Sundays. If you want working days only, add the weekend days to the holidays number yourself.
- Forgetting a holiday. A holiday inside the period that you do not enter will inflate your total, and your attendance target will be based on the wrong number.
- Mixing up the start and end dates. If the end date is before the start date, the count is not valid. Check that the start date comes first.
- Using calendar days for a working-days total. If your college counts working days only, a calendar-day total will be too high. Enter the weekend days as holidays to get the working-days total.
Common questions
Total Days Calculator FAQs
How do I calculate total days between two dates?
Count every day from the start date to the end date, including both dates, then subtract any holidays. For example, 1 September to 30 September 2026 is 30 days, and with 2 holidays the total is 28 days.
Does the total days calculator count the start and end dates?
Yes. Both the start date and the end date are counted. A period from 1 September to 30 September is 30 days, not 29.
Does it subtract weekends?
No. This calculator counts calendar days, including Saturdays and Sundays, and subtracts only the holidays you enter. If you need working days only, add the weekend days in the period to the holidays number.
How do I use total days for attendance?
Enter the total days as the total in the Attendance Percentage Calculator, along with the days you attended. That gives you your attendance percentage for the period.
What counts as a holiday?
Any day in the period when no classes are held: public holidays, college holidays, and days the college is closed. If you are counting working days only, weekend days count as holidays too.
What if the end date is before the start date?
The calculator will ask you to check your numbers. Swap the dates so the start date comes first, then calculate again.
Can I count days across two months or two years?
Yes. The calculator counts the days across any range, including across months and years. A period from 12 January to 6 February 2026 is 26 days, for example.
Does it work for school students too?
Yes. The counting is the same for school, college, and university. Enter your term dates and holidays, and the total is the same.
Is this total days calculator free?
Yes. It is completely free with no sign-up, and it runs entirely in your browser.
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