Calculate Lot Size

Lot Size Calculator

Rectangle / Square Triangle Trapezoid (Uneven Bases)
Feet (ft) Meters (m) Yards (yd)

Calculation Results:

Total Square Footage:
Total Acreage:
Square Meters:
Square Yards:
function updateInputs() { var shape = document.getElementById("lotShape").value; var group1 = document.getElementById("inputGroup1"); var group2 = document.getElementById("inputGroup2"); var group3 = document.getElementById("inputGroup3"); var label1 = document.getElementById("label1"); var label2 = document.getElementById("label2"); var label3 = document.getElementById("label3"); if (shape === "rectangle") { label1.innerText = "Width"; label2.innerText = "Length"; group1.style.display = "block"; group2.style.display = "block"; group3.style.display = "none"; } else if (shape === "triangle") { label1.innerText = "Base"; label2.innerText = "Height"; group1.style.display = "block"; group2.style.display = "block"; group3.style.display = "none"; } else if (shape === "trapezoid") { label1.innerText = "Base 1 (Shortest Side)"; label2.innerText = "Base 2 (Longest Parallel Side)"; label3.innerText = "Height (Distance between bases)"; group1.style.display = "block"; group2.style.display = "block"; group3.style.display = "block"; } } function calculateLotSize() { var shape = document.getElementById("lotShape").value; var unit = document.getElementById("unitType").value; var v1 = parseFloat(document.getElementById("val1").value); var v2 = parseFloat(document.getElementById("val2").value); var v3 = parseFloat(document.getElementById("val3").value) || 0; if (isNaN(v1) || isNaN(v2) || (shape === "trapezoid" && isNaN(v3))) { alert("Please enter valid numeric values."); return; } var areaInSquareUnits = 0; if (shape === "rectangle") { areaInSquareUnits = v1 * v2; } else if (shape === "triangle") { areaInSquareUnits = 0.5 * v1 * v2; } else if (shape === "trapezoid") { areaInSquareUnits = 0.5 * (v1 + v2) * v3; } var sqFt, sqM, sqYd, acres; if (unit === "feet") { sqFt = areaInSquareUnits; sqM = sqFt * 0.092903; sqYd = sqFt / 9; acres = sqFt / 43560; } else if (unit === "meters") { sqM = areaInSquareUnits; sqFt = sqM / 0.092903; sqYd = sqFt / 9; acres = sqFt / 43560; } else if (unit === "yards") { sqYd = areaInSquareUnits; sqFt = sqYd * 9; sqM = sqFt * 0.092903; acres = sqFt / 43560; } document.getElementById("resSqFt").innerText = sqFt.toLocaleString(undefined, {maximumFractionDigits: 2}) + " sq ft"; document.getElementById("resAcres").innerText = acres.toLocaleString(undefined, {maximumFractionDigits: 4}) + " acres"; document.getElementById("resSqM").innerText = sqM.toLocaleString(undefined, {maximumFractionDigits: 2}) + " m²"; document.getElementById("resSqYd").innerText = sqYd.toLocaleString(undefined, {maximumFractionDigits: 2}) + " sq yd"; document.getElementById("lotResult").style.display = "block"; }

How to Calculate Lot Size Effectively

Whether you are buying a new home, planning a landscaping project, or putting up a fence, knowing the exact size of your lot is critical. A lot size calculator simplifies the complex geometry of land measurement, converting simple dimensions into square footage and acreage.

Step-by-Step Guide to Measuring Your Land

To use this calculator, you first need to gather the physical dimensions of your property. You can find these on your property deed, a survey map, or by using a long measuring tape (or a laser measure for smaller suburban lots).

  • Rectangle/Square: Measure the width (frontage) and the depth (length) of the property.
  • Triangle: If your lot is a "pie-shape" in a cul-de-sac, measure the base and the vertical height from that base to the opposite point.
  • Trapezoid: Common for lots where the front and back widths are different but the sides are parallel. Measure both parallel sides and the distance between them.

Understanding Acreage Conversions

In the United States, land is primarily measured in acres. To understand the scale, remember that one acre is equal to 43,560 square feet. This is roughly the size of a standard American football field (excluding the end zones).

Example Calculation: If you have a rectangular lot that is 100 feet wide and 150 feet deep:
100 ft × 150 ft = 15,000 square feet.
15,000 ÷ 43,560 = 0.344 acres.

Why Accuracy Matters

Property value is often calculated based on square footage or price-per-acre. Even a small error in measurement can lead to significant differences in property tax assessments, listing prices, or the amount of materials (like sod or gravel) you need to purchase for home improvements. If your lot has irregular curves, it is best to divide the area into smaller shapes (like several triangles) and add them together for the most precise result.

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