More Florida schools would likely get F’s from the state under a new grading formula up for consideration by the state Board of Education next week.

New projections released Tuesday by state education officials indicate the number of failing schools in Miami-Dade could climb to 50, from the current five. Broward’s F schools could spike to 27, from five.

The projections — along with many provisions of the new grading formula — are drawing criticism from school superintendents around the state, who say some of the proposed changes go too far.

“We support increased standards and accountability measures,” Miami-Dade Superintendent Alberto Carvalho said. “But that needs to be considered side by side with the possibility of unintended consequences – consequences that could negatively impact children and the communities in which they live.”

State education officials cautioned against reading too much into the projections. They said the figures were not “strong estimates” and were only intended to “illustrate the potential impact of the proposed rule changes.”

“Don’t take these as gospel. They’re simulations only,” said Jane Fletcher, director of the DOE office of accountability and policy research.

Fletcher said she expects the letter-grade results will be different once there are two years of student scores on the FCAT 2.0, which debuted in 2011. Also, students generally perform better on an exam in its second year.

The state of Florida has awarded a letter grade to each of its public schools for more than a decade. The grade for elementary and middle schools is based largely on student performance on the Florida Comprehensive Assessment Tests, and includes a measure for improvement. High school grades also take into account graduation rates, college readiness and the number of students earning industry certification.

This year, state education officials are proposing to change the grading formula because the state standardized exam has changed. The Legislature had also asked for some changes, and tweaks were needed to get a waiver from the federal No Child Left Behind law.

Overall, the state has tested 18 changes. Among them:

•  Raising the bar on FCAT 2.0 scores, making it harder to pass the more rigorous exam.

•  Including test scores for students with disabilities and those learning English in the calculation for the school grade. Fletcher said that will help “provide focus to those students to make sure schools help them improve just like any other student.”

•  Factoring in Florida’s end-of-course exams, which are being phased in for middle and high school students.

•  Giving more weight to students who improve to high-passing grades on the state exam.

•  Crediting middle schools for students who take and perform well on high school end-of-course exams.

•  Giving an automatic F to schools that don’t have at least 25 percent of students reading at grade level.

The state Board of Education will consider the proposal Tuesday in Tallahassee.

John Padget, a state board member and former superintendent of Monroe County Schools, said he supports the new formula for all schools, elementary, middle and senior high.

“Under the existing system, it was too easy for an elementary school to get an A or B. The new grading system will send early performance signals so that taxpayers and parents will have a single, accurate measurement tool to evaluate their neighborhood school,” Padget said in an email.