Simple web converter from 0-10 grade scale to Grade Point Average (4-point) scale.
PS: It's in portuguese.
If you want to simply use it, there's a working demo here.
If you want to download and run it locally:
mkdir gpacalc
cd path/to/gpacalc
git clone https://github.com/regisin/gpa
Then in your browser, open the url file:///path/to/gpacalc/gpa/index.html.
Use it, copy it, modify it, no need to give me credit. Don't blame me if you use it and something goes wring!