{
    "name": "Teacher Student Ratio Calculator",
    "url": "https://calculators.geekmidst.com/calculators/teacher-student-ratio-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/teacher-student-ratio-calculator.md",
    "category": "Education",
    "description": "Calculate students per teacher from enrolment and full-time-equivalent staff, and how many teachers you need to meet a target ratio.",
    "summary": "The pupil–teacher ratio is the number of students divided by the number of full-time-equivalent teachers. Enter your target ratio to see the staffing it implies.",
    "also_called": [
        "Pupil–teacher ratio calculator",
        "Student–teacher ratio calculator"
    ],
    "applies_to": "Worldwide",
    "last_updated": "2026-10-29",
    "computation": "Results are computed in the visitor’s browser on the HTML page. This API describes the calculator; it does not compute results.",
    "inputs": [
        {
            "name": "students",
            "label": "Number of students",
            "type": "number",
            "default": "600"
        },
        {
            "name": "teachers",
            "label": "Teachers (full-time equivalent)",
            "type": "number",
            "default": "24"
        },
        {
            "name": "target",
            "label": "Target students per teacher",
            "type": "number",
            "default": "20",
            "optional": true
        }
    ],
    "outputs": [
        {
            "key": "students_per_teacher",
            "label": "Students per teacher",
            "format": "number"
        },
        {
            "key": "ratio_text",
            "label": "Ratio",
            "format": "text"
        },
        {
            "key": "teachers_per_100",
            "label": "Teachers per 100 students",
            "format": "number"
        },
        {
            "key": "teachers_needed",
            "label": "Teachers needed for target",
            "format": "integer"
        },
        {
            "key": "additional_teachers",
            "label": "Additional teachers needed",
            "format": "number"
        }
    ],
    "formula": {
        "text": "Students per teacher = Students ÷ FTE teachers;  Teachers needed = ⌈Students ÷ Target⌉",
        "variables": {
            "FTE teachers": "full-time-equivalent teaching staff",
            "Target": "the maximum students per teacher you must meet"
        }
    },
    "worked_example": {
        "inputs": {
            "students": "600",
            "teachers": "24",
            "target": "20"
        },
        "steps": [
            "600 ÷ 24 = 25 students per teacher (25 : 1).",
            "At 20 : 1, 600 ÷ 20 = 30 teachers are needed.",
            "30 − 24 = 6 more teachers."
        ],
        "result": "With 24 teachers for 600 students the ratio is 25 : 1; reaching 20 : 1 needs 6 more teachers."
    },
    "interpretation": "The pupil–teacher ratio is not the same as class size: teachers also have planning time and non-class duties, so average classes are usually larger than the ratio.",
    "assumptions": [
        "Teachers are counted as full-time equivalents."
    ],
    "limitations": [
        "Whether support staff, heads or specialists count as teachers depends on the reporting rules you follow."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "Is pupil–teacher ratio the same as class size?",
            "answer": "No. Class size is students in one room; the ratio spreads all students over all teachers, including those not teaching at that moment."
        },
        {
            "question": "How do I count part-time teachers?",
            "answer": "Use full-time equivalents: a teacher working half a full timetable counts as 0.5."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Ratio Calculator",
            "url": "https://calculators.geekmidst.com/calculators/ratio-calculator"
        },
        {
            "name": "Classroom Capacity Calculator",
            "url": "https://calculators.geekmidst.com/calculators/classroom-capacity-calculator"
        },
        {
            "name": "Academic Year Working Days Calculator",
            "url": "https://calculators.geekmidst.com/calculators/academic-year-working-days-calculator"
        }
    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}