Enter a GPA and the scale it is on to see the same proportion on the other three scales. This is plain linear scaling, so treat the result as an approximation and not as an official conversion.
target = value ÷ top of source scale × top of target scale. The tops are 4, 5, 10 and 100.
A 7.5 on a 10-point scale is 75 percent of the top: 3.0 on a 4.0 scale, 3.75 on a 5.0 scale and 75 percent.
For applications, ask the admissions office or use the evaluator they name. A proportional estimate is fine for a rough comparison, not for official forms.
The value is divided by the top of its own scale and multiplied by the top of the target scale. A 3.5 on a 4.0 scale is 87.5 percent of the top, which is 4.375 on a 5.0 scale, 8.75 on a 10-point scale and 87.5 percent.
No. Schools, boards and credential evaluators publish their own tables, which are often not linear. A 4.0 does not always mean 100 percent. Use the method your target institution asks for.
Transcripts use the institution's grading rules, weighting for honors courses and rounding. A straight proportion ignores all of that.
That tool uses a stated multiplier such as the CBSE rule of 9.5. This one rescales between four scales in proportion and does not apply any board's rule.