How can I convert my GWA to GPA when applying to universities abroad?

I'm planning to apply to universities abroad, but my academic records use a GWA grading system instead of GPA. Different universities seem to have different GPA scales and conversion methods, which makes the process a bit confusing. What is the best way to accurately convert GWA to GPA for admissions and scholarship applications? Are there any reliable tools or resources that can help with this?