Calculators
Exact answers to the questions that actually get asked, not just the arithmetic. Each one runs inside your browser, so the numbers you type never leave your device.
Attendance and marks
No calculators match your search.
How these calculators handle your data
Your numbers never leave your device
Worked out by your browser as you type. Nothing is transmitted, nothing is stored, and there is no account to create.
Free, with no paid tier above it
No sign-up, no daily limit, no smaller version being held back. Run every subject through them as often as you like.
Answers as you type
Results update with every keystroke, so you can try a different target or an extra subject and see the effect straight away.
Why the second question matters more than the first
Most calculators stop at the percentage. That is the easy half, and it is rarely the reason anyone came looking. The real question is the one that follows it: so how many classes can I still miss, or how many marks do I need in the final paper? Those need a different calculation, and they are the ones these pages are built around.
They are also honest about the point where the answer stops being encouraging. Some targets become arithmetically impossible partway through a term, and a calculator that quietly returns a number for that case is worse than one that says so plainly. When a target cannot be reached, these tools tell you, and then tell you the best you can still finish on, which is the figure you actually need for the conversation that follows.
Frequently asked questions
Do these calculators send my numbers to a server?
No. Each one does its work in your browser on your own device. Your attendance figures and your marks are never transmitted, there is no account, and nothing is stored once you close the tab. That is worth knowing here, because the numbers people put into these tools are usually the ones they would least like attached to their name.
Which calculators are here right now?
An attendance calculator that works out your percentage and how many classes you can still miss or must attend, and a marks percentage calculator that handles any number of subjects, different maximum marks, optional weighting, grade bands and the marks you still need to hit a target. Each is a full page rather than a box on a shared page, so the awkward cases are handled properly.
Are the 75 percent rule and the grade bands official?
No, and this is the most important thing to understand about any calculator like this. The 75 percent attendance minimum and the grade bands built in here are widely used conventions, not a single national standard. Institutions vary them, and some apply the attendance minimum per subject rather than overall. The arithmetic is exact, but your own regulations are the authority for the rules it is applied to, which is why every threshold on these pages can be changed.
Do they work offline?
Once a page has loaded, the calculation needs no connection at all. You can lose your network and keep working, because the code that does the job is already on your device. It is also a simple way to check the privacy claim for yourself.
Can I rely on these for my official records?
Treat them as a working aid rather than a record. They are exact about the maths, but they only know the numbers you type, and your register or mark sheet is the document that counts. If a result decides something that matters, such as whether you can sit an exam, confirm it against your institution figures before acting on it.
Do I need an account or an install?
No. Every calculator runs in a normal browser on a phone, tablet or computer. There is nothing to install, no extension, no sign-up and no limit on how many times you use them.