PHILADELPHIA — Education officials on Wedneday unveiled a new grading system for Pennsylvania’s public schools that they described as a tool for parents, administrators and the public to monitor and improve student achievement.

School Performance Profiles will offer academic ratings for each building based on a 100-point scale. Scores for all 3,200 traditional, charter, cyber and technical schools in the state will be available online beginning Sept. 30.

Acting Education Secretary Carolyn Dumaresq offered a preview of the rating system at a news conference and explained in detail how the figures are weighted and calculated. Buildings that score above 70 are considered to be satisfactory.

The new profiles replace the previous standard known as AYP, or adequate yearly progress, which was based solely on student math and reading scores. Pennsylvania is no longer required to use that benchmark since receiving a waiver from the federal No Child Left Behind law.

Schools are now judged on data including attendance, participation in standardized testing, graduation rates and closing the achievement gap. Ratings will be updated annually.

Forty percent of the score comes from exam results, while another 40 percent is based on how much progress students make in a given year. Exams include the Pennsylvania System of Student Assessment, or PSSAs, and high school Keystone tests in English, math and science.

Parents can use the ratings to compare academic options for their children, while administrators can use the data to set goals and allocate resources, officials said. The comprehensive profiles also include statistics like enrollment and dropout rates.