Student-Teacher Ratio Calculator Formula

Understand the math behind the student-teacher ratio calculator. Each variable explained with a worked example.

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Formulas Used

Student-Teacher Ratio

ratio = total_students / total_teachers

Students per Teacher

students_per = round(total_students / total_teachers)

Teachers Needed for 15:1

teachers_needed_for_15 = ceil(total_students / 15)

Variables

VariableDescriptionDefault
total_studentsTotal Students500
total_teachersTotal Teachers (FTE)30

How It Works

How to Calculate Student-Teacher Ratio

The ratio divides total students by total full-time equivalent teachers.

Formula

Student-Teacher Ratio = Total Students / Total Teachers (FTE)

A ratio of 16:1 means 16 students for every teacher. This is different from class size, which measures actual students in a classroom.

Worked Example

A school with 500 students and 30 full-time teachers.

total_students = 500total_teachers = 30
  1. 01Ratio = 500 / 30 = 16.7:1
  2. 02Students per teacher = round(16.7) = 17
  3. 03Teachers needed for 15:1 = ceil(500 / 15) = 34

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