Does an A always start at 90%?

No. Many schools use A = 90–100, others use A = 93–100 with A− = 90–92. Some drop plus/minus entirely. Check your own grade scale.

Is a 4.0 the maximum?

On the standard unweighted scale, yes — 4.0 is a straight-A average. Weighted scales (for honours/AP/IB courses) can exceed 4.0, sometimes up to 5.0.

Can I convert a percentage straight to GPA?

Only via a mapping like the table above, and only approximately — the percentage-to-letter cutoffs are set by each institution.

US 4.0 GPA Scale — Letter, Percentage & Points

This reference page explains the standard US 4.0 GPA scale and how letter grades, percentages and grade points line up, with a calculator preset so you can average your own courses. The table below is the most common unweighted mapping used by US high schools and universities. Use it to translate a letter or percentage into grade points, then average them with the calculator.

Letter	Percentage	Grade points
A	93–100	4.0
A−	90–92	3.7
B+	87–89	3.3
B	83–86	3.0
B−	80–82	2.7
C+	77–79	2.3
C	73–76	2.0
C−	70–72	1.7
D+	67–69	1.3
D	65–66	1.0
F	below 65	0.0

Course	Grade points	Credits

Result

The formula

GPA = Σ(gradePoints × credits) ÷ Σ(credits)

Convert each grade to its 4.0 points using the table above, multiply by credits, sum, and divide by total credits. Note that the exact percentage bands (for example whether an A starts at 90 or 93, and whether a D floor is 60 or 65) vary between schools — this table shows one widely-used version.

Worked example

Two 3-credit courses, an A (4.0) and a B (3.0):

Quality points = 4.0×3 + 3.0×3 = 12 + 9 = 21
Total credits = 6
GPA = 21 ÷ 6 = 3.50.

Source & caveat: the 4.0 letter/percentage mapping above is the common unweighted US scale as published by many US institutions and college-board resources. Boundaries and plus/minus handling differ by school — always confirm the exact scale in your school or university handbook, as they change.

Frequently asked questions

Does an A always start at 90%?: No. Many schools use A = 90–100, others use A = 93–100 with A− = 90–92. Some drop plus/minus entirely. Check your own grade scale.
Is a 4.0 the maximum?: On the standard unweighted scale, yes — 4.0 is a straight-A average. Weighted scales (for honours/AP/IB courses) can exceed 4.0, sometimes up to 5.0.
Can I convert a percentage straight to GPA?: Only via a mapping like the table above, and only approximately — the percentage-to-letter cutoffs are set by each institution.

GPA

GPA Calculator

The GPA calculator turns your courses into a grade point average on the standard 4.0 scale. For each course en...

Open calculator → Weighted grade

UK Degree Classification Boundaries

This reference page explains how UK undergraduate degrees are classified, with a credit-weighted average calcu...

Open calculator →