The complete guide to the free bunk calculator. Last updated: June 9, 2026
Every Indian college student asks the same question: "How many classes can I skip?" Whether you call it a bunk calculator, attendance skip calculator, or simply want to know how many days you can bunk college — the math is the same.
In this guide, we'll show you exactly how to calculate how many classes you can skip using the 75% attendance rule, with real examples you can apply to your own subjects today.
The basic formula to figure out how many classes you can bunk is surprisingly simple. Here's what you need:
Max Bunks = Total Classes Held − (Total Classes Held × 0.75)Or more simply: you can skip up to 25% of your classes.
For example, if 40 classes have been held for a subject:
Our calculator at 75Club makes this even easier. Instead of doing the math yourself, here's how to figure out how many bunks you have left:
Current % = (B ÷ A) × 100Safe Bunks Left = (B − (A × 0.75)) ÷ 0.75Confused? Let's look at real examples below.
You have attended 8 out of 10 classes.
You have attended 16 out of 20 classes.
You have attended 32 out of 40 classes.
This is where most students get confused. The 75% rule applies per subject, not to your overall attendance. Each subject has its own separate bunk budget.
If you have 5 subjects with 30 classes each:
You cannot skip 15 classes in Subject A and make up for it by attending more in Subject B. Each subject's attendance is tracked independently.
Tired of doing this math every time? 75Club's free bunk calculator does all of this automatically. Here's what it tells you:
The 75Club app is free, works offline, and is built specifically for Indian college students navigating the 75% attendance rule.
If you're planning to skip an entire day of college, remember that most days have 4-6 lectures across multiple subjects. Each lecture period counts separately. So skipping one full day might burn 1 bunk from each of 4-5 subjects depending on the timetable.
Use the 75Club bunk calculator to check your bunk status across all subjects before planning a full-day skip. The app shows you exactly how many safe bunks remain in every subject.
The question "how many classes can I skip" is one every Indian college student asks. The answer depends on how many classes have been held and how many you've attended. With the free 75Club bunk calculator, you get an instant, accurate answer for every subject — no manual math required.
Download 75Club today and never guess your bunks again. Free, no subscription, built for Indian students.
Everything about calculating how many classes you can skip.
The bunk calculator uses the standard 75% attendance formula: Total Classes Held × 0.75 = Minimum Attendance Required. Your safe bunks = Total Classes Held - Minimum Attendance Required. It's mathematically accurate as long as you enter the correct numbers.
You can skip up to 25% of your classes. For every 40 classes held, you can skip 10. For 20 classes held, you can skip 5. For 10 classes held, you can skip 2. Use the 75Club bunk calculator for an exact per-subject count.
To pass under the 75% rule, you cannot miss more than 25% of classes per subject. If you miss more than 25%, you risk being barred from semester exams. Check with the 75Club free bunk calculator for your specific numbers.
Since each day has multiple lecture periods, divide your total safe bunks by the number of lectures per day. For example, 10 safe bunks across 5 lectures per day = about 2 full days you can skip. Always check per-subject counts first.
In a typical semester with 30-40 classes per subject, you can bunk 7-10 lectures per subject. With 5-6 subjects, that's roughly 35-60 total safe bunks across all subjects. Download 75Club to track each subject independently.
Yes! 75Club is a free app with a built-in bunk calculator that shows you exactly how many classes you can skip per subject, your exam eligibility, and a daily "Should I go?" decision. Available on the Google Play Store.
Get the free bunk calculator and know exactly how many classes you can skip.
Get it on Google Play