What weighted HS GPA calculation methods have you seen, both at high schools and at colleges that recalculate HS GPA?
University of California recalculation: using 10th-11th grade academic (“a-g”) courses, +1 for UC-designated honors (including AP and most IB) courses and transferable college courses, three variants (unweighted, weighted-capped (up to 8 semesters of +1 honors points, most commonly seen on UC web sites), fully weighted). Calculator here: GPA Calculator for the University of California – RogerHub
California State University recalculation: same as University of California weighted-capped recalculation, except that a semester college course counts as two courses with two grades. One campus (San Luis Obispo) includes 9th grade courses and grades.
University of Central Florida recalculation: using academic courses with +1 for AP / IB / AICE / DE and +0.5 for pre-AP / pre-IB / pre-AICE: FAQ:How is my high school GPA calculated for admission?
University of Florida recalculation: using academic courses and weighted as described at How will UF compute my high school GPA? » Questions » University of Florida , but weighting values are not given.
South Carolina standardized HS GPA calculation: https://ed.sc.gov/tests/tests-files/eocep-files/uniform-grading-policy-february-2018/