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Calcimator

Student-Teacher Ratio Calculator

Calculate student-teacher ratios and resource impact from class size changes.

Inputs

Results

Current Ratio

18.2:1

Avg Class Size20 students
Effective Staff (FTE)27.5
Additional Teachers Needed1
Meets Target?No
Ratio if +1 Teacher17.5:1
Ratio if -1 Teacher18.9:1
How to Use This Calculator
  1. Enter Total Students — the full enrollment count for the school, grade, or department.
  2. Enter Total Teachers — the number of full-time classroom teachers.
  3. Add Teacher Aides and set their Aide Equivalency (%) — 50% means each aide counts as half a teacher for ratio purposes.
  4. Set Target Ratio — the maximum students-per-teacher your policy or accreditation standard requires.
  5. Review Current Ratio and Meets Target? to determine if staffing is compliant.
  6. Use Additional Teachers Needed and the Ratio if +1 Teacher outputs to make evidence-based hiring decisions.
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