Grass Seed Coverage Calculator
ANA›Life Services Authority›National Calculator Authority›Grass Seed Coverage 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; } }
Grass Seed Coverage Calculator
Calculate the amount of grass seed needed to cover your lawn based on area, grass type, and seeding method.
Lawn Length (feet)
Lawn Width (feet)
Grass Type
Kentucky Bluegrass Tall Fescue Fine Fescue Perennial Ryegrass Bermudagrass Zoysiagrass St. Augustinegrass Centipedegrass
Seeding Method
New Lawn (Full Seeding) Overseeding (Existing Lawn)
Seed Bag Size (lbs)
Price Per Bag ($) (optional)
Calculate
function graCalc() { var length = parseFloat(document.getElementById('gra-length').value); var width = parseFloat(document.getElementById('gra-width').value); var grassType = document.getElementById('gra-grass-type').value; var seedingMethod = document.getElementById('gra-seeding-method').value; var bagWeight = parseFloat(document.getElementById('gra-bag-weight').value); var pricePerBag = parseFloat(document.getElementById('gra-price-per-bag').value); var resultDiv = document.getElementById('gra-result');
// Validation if (isNaN(length) || length Please enter a valid lawn length greater than 0.'; return; } if (isNaN(width) || width Please enter a valid lawn width greater than 0.'; return; } if (isNaN(bagWeight) || bagWeight Please enter a valid bag size greater than 0.'; return; }
// Seeding rates in lbs per 1,000 sq ft (new lawn / overseeding) // Source: University Extension Services & seed manufacturer guidelines var seedingRates = { kentucky_bluegrass: { new: 2.0, overseeding: 1.0, name: "Kentucky Bluegrass" }, tall_fescue: { new: 8.0, overseeding: 4.0, name: "Tall Fescue" }, fine_fescue: { new: 4.0, overseeding: 2.0, name: "Fine Fescue" }, perennial_ryegrass: { new: 8.0, overseeding: 4.0, name: "Perennial Ryegrass" }, bermuda: { new: 1.5, overseeding: 0.75, name: "Bermudagrass" }, zoysia: { new: 2.0, overseeding: 1.0, name: "Zoysiagrass" }, st_augustine: { new: 0.5, overseeding: 0.25, name: "St. Augustinegrass" }, centipede: { new: 0.25, overseeding: 0.125,name: "Centipedegrass" } };
var rateInfo = seedingRates[grassType]; var ratePerThousand = rateInfo[seedingMethod]; // lbs per 1,000 sq ft
// Calculate area var areaSqFt = length * width; var areaAcres = areaSqFt / 43560;
// Total seed needed (lbs) // Formula: Seed (lbs) = (Area (sq ft) / 1000) * Rate (lbs/1000 sq ft) var totalSeedLbs = (areaSqFt / 1000) * ratePerThousand;
// Number of bags needed (round up) var bagsNeeded = Math.ceil(totalSeedLbs / bagWeight); var totalSeedPurchased = bagsNeeded * bagWeight; var leftoverSeed = totalSeedPurchased - totalSeedLbs;
// Cost calculation var costHTML = ''; if (!isNaN(pricePerBag) && pricePerBag > 0) { var totalCost = bagsNeeded * pricePerBag; var costPerSqFt = totalCost / areaSqFt; costHTML = 'Estimated Total Cost$' + totalCost.toFixed(2) + '' + 'Cost per sq ft$' + costPerSqFt.toFixed(4) + ''; }
var methodLabel = seedingMethod === 'new' ? 'New Lawn (Full Seeding)' : 'Overseeding';
resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Results ' + '' + 'Grass Type' + rateInfo.name + '' + 'Seeding Method' + methodLabel + '' + 'Lawn Area' + areaSqFt.toLocaleString('en-US', {maximumFractionDigits:1}) + ' sq ft (' + areaAcres.toFixed(4) + ' acres)' + 'Seeding Rate' + ratePerThousand + ' lbs per 1,000 sq ft' + 'Seed Required' + totalSeedLbs.toFixed(2) + ' lbs' + 'Bags Needed (' + bagWeight + ' lb bags)' + bagsNeeded + ' bag' + (bagsNeeded !== 1 ? 's' : '') + '' + 'Total Seed Purchased' + totalSeedPurchased.toFixed(2) + ' lbs' + 'Leftover Seed' + leftoverSeed.toFixed(2) + ' lbs' + costHTML + ''; }
#### Formula
Seed Required (lbs) = (Lawn Area (sq ft) ÷ 1,000) × Seeding Rate (lbs / 1,000 sq ft)
Bags Needed = ⌈ Seed Required ÷ Bag Size ⌉ (rounded up to nearest whole bag)
Lawn Area (sq ft) = Length (ft) × Width (ft)
Seeding rates vary by grass species and method. New lawn seeding requires approximately twice the seed of overseeding an existing lawn.
Grass TypeNew Lawn (lbs/1,000 sq ft)Overseeding (lbs/1,000 sq ft) Kentucky Bluegrass2.01.0 Tall Fescue8.04.0 Fine Fescue4.02.0 Perennial Ryegrass8.04.0 Bermudagrass1.50.75 Zoysiagrass2.01.0 St. Augustinegrass0.50.25 Centipedegrass0.250.125
#### Assumptions & References
- Bags needed are always rounded up to the nearest whole bag to ensure full coverage.
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