August 24, 2026 · 4 min read

My first guess at converting a percentage to a GPA was to divide by 25. A 75% becomes a 3.0, right? That felt tidy until I realised a 75% in my home country meant something completely different from a 75% somewhere else, and dividing by 25 was quietly underrating my grades.

Here's what actually matters when you turn a percentage into a 4.0.

Why you can't just divide by 25

The pass line is in a different place depending on where you studied. In China, a pass is 60%. In the UK it's 40%. In a lot of Indian universities it's 40% too. On a US 4.0 scale, a 1.0 is roughly a 60% pass.

So a 70% is a First Class (excellent) in the UK, but only a C under Chinese 60%-pass grading. Same number, totally different meaning, because the number only makes sense relative to where "failing" starts.

Dividing by 25 assumes everyone's pass line is 0%, which it isn't. That's why the simple method gives you a number that looks lower than your grades deserve.

A conversion table for a 60% pass line

If your grading system uses a 60% pass (common in China and several other countries), this is the mapping that comes up most often:

If your university uses a 40% pass line instead, the mapping shifts: a 70% there is near the top of the scale, not the middle. The table only works for a 60% pass line, which is the first thing worth checking about your own transcript.

How I actually did it

The honest approach is to normalise each score against your pass line first, then map it onto 4.0, and weight the result by credits. Doing that by hand across a whole transcript gets tedious quickly, so I used a percentage to GPA calculator that handles the pass-line adjustment and credit weighting for me.

The point is to avoid the "divide by 25" trap that makes a good transcript look mediocre, not to get the number perfect. American admissions officers see percentage transcripts all the time, and they'd rather have an honest approximation than a mathematically clean but wrong one.