House Square Footage Calculator

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House Square Footage Calculator

Total Square Footage

0 sq. ft.
function addRoomRow() { var container = document.getElementById('room-rows-container'); var newRow = document.createElement('div'); newRow.className = 'room-row'; newRow.style.cssText = 'display: flex; gap: 10px; margin-bottom: 15px; flex-wrap: wrap; background: #fff; padding: 15px; border-radius: 8px; border: 1px solid #eee;'; newRow.innerHTML = '
'; container.appendChild(newRow); } function calculateTotalSqFt() { var lengths = document.getElementsByClassName('room-length'); var widths = document.getElementsByClassName('room-width'); var totalSqFt = 0; for (var i = 0; i 0) { var totalCost = totalSqFt * priceInput; costDisplay.innerText = 'Estimated Value: $' + totalCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); } else { costDisplay.innerText = "; } } function resetCalculator() { var container = document.getElementById('room-rows-container'); container.innerHTML = '
'; document.getElementById('price-per-sqft').value = "; document.getElementById('total-result').innerText = '0 sq. ft.'; document.getElementById('total-cost-display').innerText = "; }

How to Use the House Square Footage Calculator

Calculating the square footage of your home is a vital step whether you are planning a renovation, applying for a mortgage, or listing your property for sale. This tool allows you to break down your home into manageable sections and provides a combined total automatically.

Step-by-Step Measurement Guide

  1. Measure Individual Rooms: Use a tape measure or laser distance tool to find the length and width of each room. For the most accurate result, measure from the baseboards.
  2. Input Dimensions: Enter the name of the room (e.g., Master Bedroom) and its dimensions in the calculator above.
  3. Add Rows for Additional Areas: Click the "+ Add Another Room" button for every unique space in your home, including hallways, closets, and bathrooms.
  4. Review the Total: The calculator sums the area (Length × Width) for every row automatically.

Calculating Odd-Shaped Rooms

If your room isn't a perfect rectangle, you can still calculate it accurately by breaking the room into smaller rectangular sections. For example, if you have an "L-shaped" kitchen, treat it as two separate rectangles, measure each, and add them as separate entries in the calculator.

Example Calculation:
If your Living Room is 20 feet long and 15 feet wide:
20 ft × 15 ft = 300 sq. ft.

If your Kitchen is 12 feet long and 10 feet wide:
12 ft × 10 ft = 120 sq. ft.

Total: 420 sq. ft.

What Counts as Square Footage?

In real estate, "Gross Living Area" (GLA) typically only includes finished, heated, and above-grade spaces. Generally, the following are not included in official square footage totals for appraisals:

  • Unfinished basements or attics
  • Garages and carports
  • Open porches or patios
  • Detached sheds or accessory buildings

Why Accuracy Matters

An error in square footage can lead to significant financial consequences. When buying materials like flooring, an overestimate leads to wasted money, while an underestimate can stall your project. In real estate sales, even a 100 sq. ft. discrepancy can change the valuation of a home by thousands of dollars depending on your local market rate.

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