Countertop Square Footage Calculator

ANA›Life Services Authority›National Calculator Authority›Countertop Square Footage 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; } }

Countertop Square Footage Calculator

Calculate the total square footage of your countertop surfaces. Add multiple sections (e.g., different countertop runs) and include an optional overhang and waste factor for accurate material estimates.

#### Section 1

Length (inches)

Depth (inches)

Overhang per Section (inches)

Waste Factor (%)

Calculate

var couSectionCount = 1;

function couAddSection() { couSectionCount++; var container = document.getElementById('cou-sections'); var div = document.createElement('div'); div.className = 'cou-section'; div.id = 'cou-section-' + couSectionCount; div.style.marginTop = '12px'; div.innerHTML = '#### Section ' + couSectionCount + ' ' + '' + '' + 'Length (inches)' + '' + '' + '' + 'Depth (inches)' + '' + '' + ''; container.appendChild(div); }

function couRemoveSection() { if (couSectionCount 100) { errors.push('Waste factor must be between 0 and 100.'); }

var sections = []; for (var i = 1; i 1) continue; // skip empty trailing sections var l = parseFloat(lVal); var d = parseFloat(dVal); if (lVal === '' || isNaN(l) || l 0 && !isNaN(d) && d > 0) { sections.push({ index: i, length: l, depth: d }); } }

if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

if (sections.length === 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Please enter at least one valid section.'; return; }

// Formula: // Effective depth (inches) = depth + overhang // Section area (sq in) = length × effective_depth // Section area (sq ft) = section_area_sq_in / 144 // Total raw sq ft = sum of all section sq ft // Total with waste = total_raw_sq_ft × (1 + wastePct / 100)

var totalRawSqIn = 0; var sectionDetails = [];

for (var s = 0; s ' + 'Section ' + s.index + '' + '' + s.length.toFixed(2) + '"' + '' + s.depth.toFixed(2) + '"' + '' + s.effectiveDepth.toFixed(2) + '"' + '' + s.areaSqFt.toFixed(3) + ' sq ft' + ''; }).join('');

resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Results ' + '' + '' + '' + 'Section' + 'Length' + 'Depth' + 'Eff. Depth' + 'Area' + '' + '' + '' + detailRows + '' + '' + '' + '' + 'Total Raw Area' + '' + totalRawSqFt.toFixed(2) + '' + 'sq ft' + '' + '' + 'With ' + wastePct.toFixed(0) + '% Waste' + '' + totalWithWaste.toFixed(2) + '' + 'sq ft' + '' + '' + 'Overhang applied: ' + overhang.toFixed(2) + ' inches per section. ' + 'Total sections: ' + sections.length + '.

'; }

#### Formula

Effective Depth (in) = Depth + Overhang Section Area (sq in) = Length × Effective Depth Section Area (sq ft) = Section Area (sq in) ÷ 144 Total Raw Area (sq ft) = Σ Section Areas (sq ft) Total with Waste (sq ft) = Total Raw Area × (1 + Waste% ÷ 100)

There are 144 square inches in 1 square foot (12 in × 12 in = 144 sq in). The overhang is added to the depth of each section to account for the countertop edge that extends beyond the cabinet.

#### Assumptions & References

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References

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