Built in the classroom, not just for it
Every calculator on this site started as a spreadsheet formula written for real students, by someone who spent decades grading real assignments.
From the lecture hall to your browser tab
For over two decades, I taught information technology and computer science courses at a university here in Canada — everything from first-year programming labs to senior seminars. Somewhere between marking my first stack of midterms and my last, I lost count of how many times a student showed up at my office hours holding a calculator, trying to work out exactly what they needed on a final exam to pass the course.
The math itself is simple — it's the same weighted-average formula I used every semester to post grades. But most calculators built for it were either clunky, cluttered with ads, or designed by someone who had clearly never sat on either side of a grade book. So I built my own, first for my own classes, then for anyone who needed it.
Every tool on this site is built with two people in mind: the student trying to figure out where they stand, and the professor who wants that student to have a clear, honest answer. No guesswork, no jargon, no accounts to create — just the same formulas used in real Canadian classrooms, made simple enough for a first-year student to understand at a glance.
That's still the standard I hold every calculator on this site to today.
Designed for both sides of the grade book
Three principles carried over directly from the classroom into every calculator we build.
Built for students first
Every calculator answers the exact question a student actually has — "what do I need to pass?" — without extra steps, sign-ups, or confusing terminology.
Trusted by educators
The formulas behind every tool are the same standard weighted-average methods used by professors and instructors across Canadian colleges and universities.
Private by design
Grades are personal. Every calculation runs locally in your browser — nothing is uploaded, logged, or stored on a server.
A quick history
Started teaching
Began lecturing in information technology and introductory computer science at a Canadian university, while also working part-time as a systems analyst.
The first spreadsheet
Built an internal grade-weighting spreadsheet for my own students after one too many office-hour conversations about midterm math.
Retired from full-time teaching
Stepped back from the classroom after twenty years, but kept hearing from former students and colleagues who still used that old spreadsheet.
These calculators
Turned that spreadsheet into a set of free, ad-light online calculators — built with the same care I put into every course I ever taught.
Try the calculators for yourself
Whether you're a student checking where you stand or an instructor pointing your class to a reliable tool, everything here is free and built to be understood at a glance.