Nursery Container Sizing Calculator
ANA›Life Services Authority›National Calculator Authority›Nursery Container Sizing Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Nursery Container Sizing Calculator
Determine the recommended container size (in gallons) for nursery plants based on root ball dimensions and plant spread. Uses industry-standard nursery trade container sizing guidelines.
Root Ball Diameter (inches)
Root Ball Height / Depth (inches)
Plant Canopy Spread (inches)
Plant Height Above Soil (inches)
Calculate Container Size
function nurCalc() { var resultDiv = document.getElementById('nur-result');
var rbDiam = parseFloat(document.getElementById('nur-rootball-diameter').value); var rbH = parseFloat(document.getElementById('nur-rootball-height').value); var spread = parseFloat(document.getElementById('nur-plant-spread').value); var pHeight = parseFloat(document.getElementById('nur-plant-height').value);
// --- Validation --- var errors = []; if (isNaN(rbDiam) || rbDiam 120) errors.push("Root ball diameter seems unusually large (max 120 in). Please verify."); if (rbH > 120) errors.push("Root ball height seems unusually large (max 120 in). Please verify."); if (spread > 300) errors.push("Plant spread seems unusually large (max 300 in). Please verify."); if (pHeight > 600) errors.push("Plant height seems unusually large (max 600 in). Please verify.");
if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '' + errors.join('') + ''; return; }
// --- Step 1: Root Ball Volume (cylinder approximation, in cubic inches) --- // V_rootball = π × (d/2)² × h var radius_rb = rbDiam / 2.0; var volRootballCuIn = Math.PI * radius_rb * radius_rb * rbH;
// --- Step 2: Convert root ball volume to US gallons --- // 1 US gallon = 231 cubic inches var volRootballGal = volRootballCuIn / 231.0;
// --- Step 3: Container volume must accommodate root ball + 15% buffer --- // (industry standard: container should be ~15% larger than root ball volume) var containerVolGal = volRootballGal * 1.15;
// --- Step 4: Spread-based minimum container diameter check --- // Recommended container diameter ≥ spread / 3 (ANSI Z60.1 guideline) var minContainerDiamIn = spread / 3.0;
// --- Step 5: Height-based minimum container depth check --- // Container depth ≥ root ball height + 1 inch drainage allowance var minContainerDepthIn = rbH + 1.0;
// --- Step 6: Derive container volume from minimum diameter & depth --- // V_min_container = π × (minDiam/2)² × minDepth (cubic inches → gallons) var minContainerVolFromSpread = Math.PI * Math.pow(minContainerDiamIn / 2.0, 2) * minContainerDepthIn / 231.0;
// --- Step 7: Take the larger of the two volume requirements --- var requiredVolGal = Math.max(containerVolGal, minContainerVolFromSpread);
// --- Step 8: Map to standard nursery trade container sizes (gallons) --- // Standard sizes: #1=1, #2=2, #3=3, #5=5, #7=7, #10=10, #15=15, // #25=25, #45=45, #65=65, #100=100, #200=200, #300=300 var stdSizes = [ {gal: 0.5, label: "#Liner / 0.5 gal"}, {gal: 1, label: "#1 (1 gal)"}, {gal: 2, label: "#2 (2 gal)"}, {gal: 3, label: "#3 (3 gal)"}, {gal: 5, label: "#5 (5 gal)"}, {gal: 7, label: "#7 (7 gal)"}, {gal: 10, label: "#10 (10 gal)"}, {gal: 15, label: "#15 (15 gal)"}, {gal: 25, label: "#25 (25 gal)"}, {gal: 45, label: "#45 (45 gal)"}, {gal: 65, label: "#65 (65 gal)"}, {gal: 100, label: "#100 (100 gal)"}, {gal: 200, label: "#200 (200 gal)"}, {gal: 300, label: "#300 (300 gal)"} ];
var recommended = stdSizes[stdSizes.length - 1]; // default to largest for (var i = 0; i = requiredVolGal) { recommended = stdSizes[i]; break; } }
// --- Step 9: Suggested container diameter & depth for reference --- // Back-calculate from recommended gallon size assuming H:D ratio ≈ 0.9 (typical nursery pot) // V = π × (D/2)² × (0.9×D) → D³ = V × 4 / (π × 0.9) → D = cbrt(...) var volCuIn = recommended.gal * 231.0; var suggestedDiamIn = Math.pow(volCuIn * 4.0 / (Math.PI * 0.9), 1.0/3.0); var suggestedDepthIn = 0.9 * suggestedDiamIn;
// --- Format output --- resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Results ' + '' + 'Root Ball Volume' + '' + volRootballCuIn.toFixed(1) + ' in³ (' + volRootballGal.toFixed(2) + ' gal)' + 'Volume Required (with 15% buffer)' + '' + containerVolGal.toFixed(2) + ' gal' + 'Min Container Diameter (spread ÷ 3)' + '' + minContainerDiamIn.toFixed(1) + ' in' + 'Min Container Depth (root ball + 1 in)' + '' + minContainerDepthIn.toFixed(1) + ' in' + 'Combined Required Volume' + '' + requiredVolGal.toFixed(2) + ' gal' + '' + '' + 'Recommended Container: ' + recommended.label + '' + 'Approx. container dimensions: ' + suggestedDiamIn.toFixed(1) + '" diameter × ' + suggestedDepthIn.toFixed(1) + '" deep' + ''; }
#### Formulas Used
1. Root Ball Volume (cylinder): Vrootball = π × (drb / 2)² × hrb
2. Volume-based container requirement (15% buffer): Vvol = Vrootball × 1.15
3. Spread-based minimum container diameter (ANSI Z60.1): Dmin = Plant Spread / 3
4. Depth-based minimum container depth: Depthmin = hrb + 1 inch
5. Volume from spread/depth constraint: Vspread = π × (Dmin / 2)² × Depthmin
6. Required container volume: Vrequired = max(Vvol, Vspread)
7. Standard size selection: Smallest standard nursery trade container size ≥ Vrequired
Unit conversion: 1 US gallon = 231 cubic inches
#### Assumptions & References
- Root ball is approximated as a cylinder (conservative; actual root balls may be slightly smaller).
- A 15% volume buffer is added above root ball volume to allow for soil, drainage, and root expansion — consistent with nursery industry practice.
- Minimum container diameter = plant spread ÷ 3, per ANSI Z60.1 (American Standard for Nursery Stock).
- Standard nursery trade container sizes follow the American Nursery & Landscape Association (ANLA) / AmericanHort trade size designations (#1 through #300).
- Suggested container dimensions are back-calculated using a typical nursery pot height-to-diameter ratio of 0.9.
- Reference: ANSI Z60.1-2014, American Standard for Nursery Stock; AmericanHort Container Size Guidelines.
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