Free tools. No account. Nothing stored.

Ontario GPA Calculator

Ontario marks come back as percentages, and the grading culture is different from the US — an 80 is a solid A here, and 50 is the line that gets you the credit. If you’re at a university like U of T, Waterloo, McMaster, Queen’s, or Western and need your fine GPA from your percentages, this is the calculator you want.

Enter each course as a percentage and its weight in credits. The tool maps every mark to its Ontario letter grade, turns the letter into points on the scale you pick (4.0 or 4.3), and blends everything by credits.

Ontario courses are graded in percentages, and 50 is the line that passes. Pick your school’s scale, add each course with its percentage, and this maps every mark to a letter and GPA points the Ontario way.

How the Ontario GPA scale works

Ontario universities hand out letter grades from a percentage, and most schools roughly follow the same cut-offs:

  • 90–100 = A+
  • 85–89 = A
  • 80–84 = A−
  • 77–79 = B+
  • 73–76 = B
  • 70–72 = B−
  • 67–69 = C+
  • 63–66 = C
  • 60–62 = C−
  • 50–59 = D range (still a pass)
  • Below 50 = F

Notice the shift: an 80 in the US is usually a B minus; in Ontario it’s an A minus. A 4.0-scale school gives A+ 4.0 (so 90–100 all earn full marks), while a 4.3-scale school like U of T Mississauga’s neighbours or many Ontario colleges rewards an A+ with 4.3. That’s the main difference between the two scales you can select above.

The formula

GPA = Σ(grade points × credits) ÷ Σcredits

Each percentage becomes a letter, each letter pulls its points from the scale, and you weight by credit hours. A 4.0 on the 4.0 scale is perfect; a 4.0 on the 4.3 scale is not perfect — it’s more like a high B+ plus. Keep the scale in mind when you compare yourself against US GPAs.

Worked example

Say your transcript looks like this on the 4.0 scale:

  • Math 88% (A) × 4.0, worth 3 credits = 12.0 points
  • English 74% (B) × 3.0, worth 3 credits = 9.0 points
  • Biology 81% (A−) × 3.7, worth 3 credits = 11.1 points

Add the points: 12.0 + 9.0 + 11.1 = 32.1. Divide by the 9 total credits: 3.57 GPA.

What about U of T’s scale specifically?

U of T (St. George, Scarborough, and Mississauga) runs an A+ at 90+, A at 85–89, A− at 80–84, and so on — that’s exactly the 4.0 line this calculator uses. The main quirk is that U of T’s official 4.0 gives 4.0 for both A and A+ (no 4.3 anywhere), so pick the 4.0 scale for U of T. Schools using the 4.3 scale (several Ontario colleges and some universities) give the extra 0.3 for a 90+.

Frequently asked questions

Is a 50 really a pass in Ontario?

Yes — 50% is the standard passing grade at Ontario universities. Some courses or programs set the bar higher (nursing and engineering programs commonly need 60–70 in core courses). When in doubt, your program’s rules beat any chart.

Do I convert my percentage to GPA the same way as in the US?

No, and that’s a cheap mistake. A US chart maps an 80 to about a B− (2.7); Ontario maps an 80 to an A− (3.7). If you plug an Ontario 80 into a US calculator, you come out nearly a full point lower than the truth.

Why are there two scales?

Ontario schools mostly use 4.0 (U of T, Waterloo, McMaster, Western, Queen’s). The 4.3 scale is common at Ontario colleges and a few universities — it just gives 90–100 an extra 0.3. Pick whichever your school lists in its calendar; the registrar’s chart is the final word.

Can I use percentages if my school grades in letters?

Yes — just convert each letter to your school’s midpoint percentage first (an A is roughly 85–89, so 85) and enter that. The Ontario letter-to-GPA route via the letter grade to GPA converter is the cleaner path if you already have letters.

Does an A+ help on the 4.0 scale?

On the strict 4.0 scale, no — an A and an A+ both earn 4.0, so a 92 and an 88 are identical for GPA. On the 4.3 scale, the A+ earns the extra 0.3 and does help.

Other tools

Or browse everything on the student GPA tools page.