Attendance Percentage Calculator
Track attendance for multiple subjects instantly. Fast, accurate, and completely private. This free tool calculates your attendance percentage and shows how many classes you can safely bunk based on standard attendance rules while maintaining your required percentage. No signup, no data sharing—everything runs right in your browser.
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What is Attendance Percentage?
Attendance percentage is a simple measure of how often you show up for classes or work. It's calculated as:
Attendance % = (Classes Attended ÷ Total Classes) × 100
Most institutions set a minimum threshold you must maintain—typically 75% in schools and colleges. If you fall below this, you may become ineligible for exams, assignments, or other academic requirements. Your employer or school may also have different rules, so always verify your specific requirement.
How This Calculator Works
This tool is designed to help you track attendance across multiple subjects at once. Here's what it does:
Add subjects one by one
Enter the subject name, classes attended, total classes held, and your required attendance percentage (default: 75%).
Instantly see three key metrics per subject
Attendance %: Your current percentage for that subject. Status: Green (safe), yellow (warning), or red (critical). Bunkable classes: How many future classes you can safely skip while maintaining your required percentage.
Check your overall attendance
At the bottom, you'll see your overall attendance percentage calculated across all subjects combined using weighted attendance.
Note: Your data is saved to your browser using localStorage. It won't be lost if you refresh the page, but clearing your browser data will erase your saved subjects.
Real-Life Examples
Let's look at how the formula works in actual situations:
High School Student
Your Math class has held 40 classes. You attended 35.
(35 ÷ 40) × 100 = 87.5%
✓ Safe—exceeds typical 75% requirement. You can bunk some future classes safely.
College Student
Your Physics course has 50 total classes. You attended 36.
(36 ÷ 50) × 100 = 72%
⚠️ Warning—below 75%. You need to attend upcoming classes.
Workplace
Your company tracked 22 working days. You attended 21.
(21 ÷ 22) × 100 = 95.5%
✓ Excellent—meets workplace standards (typically 95%+).
Diploma Program
Your technical course requires 80%. Total classes: 60. Attended: 50.
(50 ÷ 60) × 100 = 83.3%
✓ Safe—meets the strict 80% requirement for technical programs.
Understanding Bunkable Classes
"Bunkable classes" are the maximum number of future classes you can skip while still maintaining your required attendance percentage, assuming all skipped classes increase the total count but not your attended count.
The formula is:
Bunkable = floor( (Attended × 100 − Required% × Total) ÷ Required% )
floor means we always round down to the nearest whole number
⚠️ Important Rule
If you are already below your required percentage, you cannot bunk any more classes. The calculator will show 0 bunkable classes. You must attend future classes to bring your attendance back up to the required level.
Example: How Bunkable Classes Work
Math class: 40 classes conducted, you attended 32, required: 75%
Current: (32 ÷ 40) × 100 = 80% ✓ Safe
Bunkable = floor( (32 × 100 − 75 × 40) ÷ 75 ) = floor( 800 ÷ 75 ) = 10 classes
You can skip up to 10 future classes. If you skip 11, your attendance drops below 75%.
What is Weighted Overall Attendance?
When you add multiple subjects, the calculator shows your overall attendance across all subjects combined. This is calculated by treating all your classes as one pool:
Overall Attendance % = (Total Attended Across All Subjects ÷ Total Classes Across All Subjects) × 100
Example: If you have Mathematics (40 attended / 50 total) and English (35 attended / 50 total), your overall attendance is:
(40 + 35) ÷ (50 + 50) × 100 = 75 ÷ 100 × 100 = 75%
This is different from averaging (which would be (80% + 70%) ÷ 2 = 75%). The weighted method is more accurate because it accounts for the actual number of classes, not just the percentages.
Step-by-Step: How to Use This Tool
1. Fill in the subject form
Enter your subject name (e.g., "Mathematics"), the number of classes you attended, the total classes held, and your required attendance percentage (default 75%).
2. Click "Add Subject"
The button is enabled once all fields are valid. Your subject will be added to the list below.
3. Review your results
Each subject shows: attendance percentage, status badge (green/yellow/red), and how many classes you can safely bunk.
4. Add more subjects
Repeat for each subject. Your overall attendance automatically updates.
5. Check your overall attendance
Once you add at least one subject, a summary at the bottom shows your combined attendance and status.
6. Delete subjects if needed
Click the trash icon on any subject card to remove it. Your data is saved automatically.
Understanding Status Badges
Each subject shows a color-coded status badge:
✅ Green (Safe)
Your attendance meets or exceeds the required percentage. You can safely bunk the number of classes shown.
⚠️ Yellow (Warning)
Your attendance is between 65% and below the required percentage. You need to attend more classes. No bunking is safe at this level.
❌ Red (Critical)
Your attendance is below 65%. You're at serious risk of becoming ineligible. Attend immediately.
Attendance Requirements by Institution Type
Different institutions have different requirements. Here's what's typical:
Schools
Standard: 75%. Some schools require 80% for exam eligibility. Competitive entrance exams often have stricter rules. Always check your school's handbook.
Colleges & Universities
Standard: 75%. Engineering programs often require 80%. Medical colleges may be stricter. Some allow 65-70% with valid medical certificates.
Technical Diplomas
SBTET, polytechnics, and vocational programs typically require 80%. Practical sessions are often counted separately or more strictly.
Workplaces
Most companies expect 95%+ attendance. HR uses this for performance reviews, promotions, and benefits eligibility.
⚠️ Important: Always verify your specific institution's attendance policy. Rules vary significantly by school, college, state, and country. When in doubt, ask your academic advisor or HR manager.
Tracking Attendance Over Different Periods
You don't need to wait until the end of the semester or year to calculate. This tool works for any timeframe:
Weekly Check-ins
Track your attendance each week to spot bad patterns early. If you're consistently losing attendance, you can take corrective action before it becomes a problem.
Monthly Reviews
Update your subjects monthly to see if you're on track. This helps you decide if you can afford to bunk an upcoming class safely.
Semester & Annual Tracking
Final calculation before grades are finalized. Confirms you're eligible for exams and that your attendance meets official requirements.
Why Accurate Attendance Tracking Matters
Avoid last-minute surprises: Discover early if you're trending toward ineligibility, not on exam day.
Plan safely: Know exactly how many classes you can safely bunk per subject without falling below requirements.
Catch trends early: If attendance is dropping, identify it weekly rather than discovering it after the semester.
Support appeals: If you need to request an exemption or extension, accurate records strengthen your case.
Eliminate guessing: Stop relying on rough estimates. Know your exact percentage and safe bunk count.
Frequently Asked Questions
What is the formula for attendance percentage?
Attendance % = (Classes Attended ÷ Total Classes) × 100. For example: if you attended 45 out of 50 classes, your attendance is (45 ÷ 50) × 100 = 90%.
How is bunkable classes calculated?
Bunkable classes = floor((Attended × 100 − Required% × Total) ÷ Required%). This tells you the maximum number of future classes you can skip while maintaining your required percentage. If you're already below the required percentage, this value is 0.
What if I'm already below the required percentage?
If your current attendance is below your required percentage, you cannot safely bunk any more classes. The calculator shows 0 bunkable classes. You must attend all future classes to bring your percentage back up.
How do I calculate overall attendance when I have multiple subjects?
Overall attendance is calculated by adding all your attended classes and dividing by the total of all classes across all subjects. It's not an average of percentages—it's a weighted calculation based on actual class counts.
Can I use this tool to track attendance weekly or monthly?
Yes. Update your subjects' attended and total classes counts whenever you want—daily, weekly, or monthly. The formula works for any time period. Just keep updating the numbers.
Does this tool work for employees too?
Absolutely. HR teams use the same attendance formula. Track working days instead of classes. Most companies require 95%+ attendance.
Is my attendance data stored on a server?
No. All your data stays on your device using your browser's localStorage. We never send it to any server, and we never track or sell your information. Your attendance is completely private.
What's the difference between this calculator and a spreadsheet?
This calculator gives instant results with no setup required. A spreadsheet requires manual configuration and formula writing. Plus, this tool automatically shows status badges and bunkable class calculations.
Can I change the required percentage for each subject?
Yes. When you add a subject, you can set the required percentage (1-100). The default is 75%, but you can customize it per subject if different classes have different requirements.
Do online and in-person classes count equally?
That depends on your institution. Most treat them the same, but some have different rules. Check your school's or employer's policy. If they're weighted differently, calculate them as separate subjects.
Privacy & Data Security
No server storage
All calculations happen in your browser. Your attendance data never leaves your device.
No tracking or analytics
We don't track what you calculate, don't sell your data, and don't share it with third parties.
localStorage persistence
Your subjects are saved locally. If you clear your browser data, they'll be deleted. To back them up, write them down.
Take Control of Your Attendance Today
Whether you're in high school, college, or the workplace, knowing your exact attendance percentage puts you in control. This tool gives you the clarity to make safe decisions about when you can miss a class and when you need to show up.
Use it weekly or monthly to stay on track. The earlier you catch attendance problems, the more time you have to fix them.
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