Square Footage Calculator — Calculate Area, Perimeter, and Costs

Square Footage Calculator

Calculate square footage, perimeter, and material costs for rooms, floors, walls, and land areas. Perfect for flooring, painting, tiling, and construction projects.

Step 1: Room Dimensions

20 ft
15 ft

How to Measure

Measure the length and width of your room in feet. For irregular shapes, break them down into rectangles and add them together. Always add 5-10% extra for material waste.

Step 2: Material & Costs

$3.50
10%

Common Material Costs

Flooring: $2-8/sq ft, Carpet: $3-6/sq ft, Tile: $4-15/sq ft, Hardwood: $8-15/sq ft. Labor costs are typically 50-100% of material costs.

Square Footage Results

Summary
Material Comparison
Breakdown

Total Area

300 sq ft
20 ft × 15 ft rectangle
Perimeter
70 ft
Material Cost
$1,050
Area with Waste
330 sq ft
Cost with Waste
$1,155

Material Cost Comparison

Material Type Cost per sq ft Material Cost Total with Waste

Area Calculation Formula

Area Formulas

Rectangle: Area = Length × Width

Triangle: Area = ½ × Base × Height | Circle: Area = π × Radius² | Add waste: Total Area = Area × (1 + Waste%)

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