{
    "name": "Plant Population Calculator",
    "url": "https://calculators.geekmidst.com/calculators/plant-population-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/plant-population-calculator.md",
    "category": "Agriculture",
    "description": "Count plants per acre, per hectare and per square metre from row spacing and in-row plant spacing, and the total for your field.",
    "summary": "Each plant occupies a rectangle of row spacing × plant spacing. Divide the area by that rectangle to get the plant population.",
    "also_called": [
        "Plants per acre calculator",
        "Plant density 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": "row_spacing",
            "label": "Row spacing",
            "type": "number",
            "default": "75"
        },
        {
            "name": "plant_spacing",
            "label": "Plant spacing in the row",
            "type": "number",
            "default": "20"
        },
        {
            "name": "spacing_unit",
            "label": "Spacing in",
            "type": "select",
            "default": "cm",
            "options": {
                "cm": "Centimetres",
                "in": "Inches",
                "m": "Metres",
                "ft": "Feet"
            }
        },
        {
            "name": "plants_per_hill",
            "label": "Plants per hill or station",
            "type": "number",
            "default": "1"
        },
        {
            "name": "area",
            "label": "Field area",
            "type": "number",
            "default": "5"
        },
        {
            "name": "area_unit",
            "label": "Area in",
            "type": "segmented",
            "default": "acre",
            "options": {
                "acre": "Acres",
                "ha": "Hectares"
            }
        }
    ],
    "outputs": [
        {
            "key": "plants_per_acre",
            "label": "Plants per acre",
            "format": "integer"
        },
        {
            "key": "plants_per_ha",
            "label": "Plants per hectare",
            "format": "integer"
        },
        {
            "key": "plants_per_m2",
            "label": "Plants per square metre",
            "format": "number"
        },
        {
            "key": "total_plants",
            "label": "Plants in the field",
            "format": "integer"
        },
        {
            "key": "area_per_plant_m2",
            "label": "Area per plant",
            "format": "decimal4"
        }
    ],
    "formula": {
        "text": "Plants per m² = Plants per hill ÷ (Row spacing × Plant spacing, in m);  Per hectare = × 10,000;  Per acre = × 4,046.86",
        "variables": {
            "Row spacing": "distance between rows",
            "Plant spacing": "distance between plants (or hills) along the row",
            "Plants per hill": "plants at each planting station"
        }
    },
    "worked_example": {
        "inputs": {
            "row_spacing": "75",
            "plant_spacing": "20",
            "spacing_unit": "cm",
            "plants_per_hill": "1",
            "area": "5",
            "area_unit": "acre"
        },
        "steps": [
            "Area per plant = 0.75 m × 0.20 m = 0.15 m².",
            "Per hectare = 10,000 ÷ 0.15 = 66,667; per acre = 4,046.86 ÷ 0.15 = 26,979.",
            "For 5 acres: 26,979.04 × 5 = 134,895 plants."
        ],
        "result": "At 75 × 20 cm spacing there are about 66,667 plants per hectare, or 26,979 per acre, which is 134,895 plants on 5 acres."
    },
    "interpretation": "This is the planted population. The stand you harvest is lower after germination failures and losses, so compare it with your target established population.",
    "assumptions": [
        "Spacing is uniform across the field, with no headlands or paths."
    ],
    "limitations": [
        "For bed or paired-row systems, use the average row spacing across one full repeat."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "Why is my count lower in the field?",
            "answer": "Not every seed emerges and some seedlings die. Divide the planted population by your expected establishment to set the seed rate."
        },
        {
            "question": "How do I handle paired rows?",
            "answer": "Use the width of one full repeat (the pair plus its gap) divided by the number of rows in it as the average row spacing."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Plant Spacing Calculator",
            "url": "https://calculators.geekmidst.com/calculators/plant-spacing-calculator"
        },
        {
            "name": "Seed Rate Calculator",
            "url": "https://calculators.geekmidst.com/calculators/seed-quantity-per-acre-calculator"
        },
        {
            "name": "Crop Yield per Acre Calculator",
            "url": "https://calculators.geekmidst.com/calculators/crop-yield-per-acre-calculator"
        }
    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}