Weatherstripping Length and Cost Calculator
ANA›Life Services Authority›National Calculator Authority›Weatherstripping Length and Cost 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; } }
Weatherstripping Length and Cost Calculator
Calculate the total length of weatherstripping needed for your doors and windows, along with the estimated material cost.
Number of Standard Doors
doors
Door Width
inches
Door Height
inches
Number of Windows
windows
Window Width
inches
Window Height
inches
Waste / Overlap Factor
%
Weatherstripping Price
$/linear ft
Roll / Package Length
feet
Calculate Fill in the fields above and click Calculate.
function weaCalc() { var resultDiv = document.getElementById('wea-result');
var numDoors = parseFloat(document.getElementById('wea-num-doors').value); var doorWidth = parseFloat(document.getElementById('wea-door-width').value); var doorHeight = parseFloat(document.getElementById('wea-door-height').value); var numWindows = parseFloat(document.getElementById('wea-num-windows').value); var winWidth = parseFloat(document.getElementById('wea-win-width').value); var winHeight = parseFloat(document.getElementById('wea-win-height').value); var wastePct = parseFloat(document.getElementById('wea-waste').value); var pricePerFoot = parseFloat(document.getElementById('wea-price-per-foot').value); var rollLength = parseFloat(document.getElementById('wea-roll-length').value);
// --- Validation --- if (isNaN(numDoors) || numDoors Please enter a valid whole number for Number of Doors (0 or more).'; return; } if (isNaN(numWindows) || numWindows Please enter a valid whole number for Number of Windows (0 or more).'; return; } if (numDoors === 0 && numWindows === 0) { resultDiv.innerHTML = 'Please enter at least one door or one window.'; return; } if (numDoors > 0 && (isNaN(doorWidth) || doorWidth Please enter a valid Door Width greater than 0.'; return; } if (numDoors > 0 && (isNaN(doorHeight) || doorHeight Please enter a valid Door Height greater than 0.'; return; } if (numWindows > 0 && (isNaN(winWidth) || winWidth Please enter a valid Window Width greater than 0.'; return; } if (numWindows > 0 && (isNaN(winHeight) || winHeight Please enter a valid Window Height greater than 0.'; return; } if (isNaN(wastePct) || wastePct 50) { resultDiv.innerHTML = 'Waste/Overlap Factor must be between 0% and 50%.'; return; } if (isNaN(pricePerFoot) || pricePerFoot Please enter a valid Price per linear foot greater than 0.'; return; } if (isNaN(rollLength) || rollLength Please enter a valid Roll/Package Length greater than 0.'; return; }
// --- Core Formulas --- // Door perimeter: seal two vertical sides + top (not bottom threshold — handled separately) // Full perimeter = 2 * height + width (3-sided seal; bottom uses door sweep) var doorPerimeterIn = (2 * doorHeight + doorWidth); // inches per door var doorPerimeterFt = doorPerimeterIn / 12; // feet per door var totalDoorFt = doorPerimeterFt * numDoors;
// Window perimeter: all 4 sides sealed var winPerimeterIn = 2 * (winWidth + winHeight); // inches per window var winPerimeterFt = winPerimeterIn / 12; // feet per window var totalWindowFt = winPerimeterFt * numWindows;
// Raw total length var rawTotalFt = totalDoorFt + totalWindowFt;
// Apply waste/overlap factor var adjustedTotalFt = rawTotalFt * (1 + wastePct / 100);
// Number of rolls needed (ceiling) var rollsNeeded = Math.ceil(adjustedTotalFt / rollLength);
// Total cost based on actual adjusted length var totalCost = adjustedTotalFt * pricePerFoot;
// Cost if buying whole rolls var rollCost = rollsNeeded * rollLength * pricePerFoot;
// --- Display Results --- var html = '### Results '; html += 'Door Weatherstripping (per door)' + '' + doorPerimeterFt.toFixed(2) + ' ft'; html += 'Total Door Weatherstripping' + '' + totalDoorFt.toFixed(2) + ' ft'; html += 'Window Weatherstripping (per window)' + '' + winPerimeterFt.toFixed(2) + ' ft'; html += 'Total Window Weatherstripping' + '' + totalWindowFt.toFixed(2) + ' ft'; html += 'Raw Total Length' + '' + rawTotalFt.toFixed(2) + ' ft'; html += 'Adjusted Length (incl. ' + wastePct + '% waste)' + '' + adjustedTotalFt.toFixed(2) + ' ft'; html += 'Rolls / Packages Needed' + '' + rollsNeeded + ' roll(s) × ' + rollLength + ' ft'; html += 'Estimated Material Cost (exact length)' + '$' + totalCost.toFixed(2) + ''; html += 'Estimated Material Cost (whole rolls)' + '$' + rollCost.toFixed(2) + ''; html += '';
resultDiv.innerHTML = html; }
#### Formulas Used
Door perimeter (3-sided seal): Door Length = 2 × Door Height + Door Width (inches) ÷ 12 = feet
Note: Only two vertical sides and the top are sealed with weatherstripping. The bottom of the door uses a separate door sweep.
Window perimeter (4-sided seal): Window Length = 2 × (Window Width + Window Height) (inches) ÷ 12 = feet
Raw Total Length: Raw Total = (Door Length × Number of Doors) + (Window Length × Number of Windows)
Adjusted Total Length: Adjusted Total = Raw Total × (1 + Waste % ÷ 100)
Rolls Needed: Rolls = ⌈ Adjusted Total ÷ Roll Length ⌉ (ceiling function)
Material Cost: Cost = Adjusted Total (ft) × Price per Linear Foot
#### Assumptions & References
- Door weatherstripping covers three sides only (two vertical jambs + top header). The door bottom requires a separate door sweep product.
- Window weatherstripping covers all four sides of the window frame.
- A waste/overlap factor of 10% is recommended as a default to account for corners, cuts, and overlaps.
- Typical foam tape weatherstripping costs $0.30–$1.00 per linear foot depending on material (foam, rubber, silicone, V-strip, door sweep).
- Reference: U.S. Department of Energy — Weatherstripping (energy.gov/energysaver/weatherstripping).
- Reference: This Old House — How to Weatherstrip a Door.
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