CalculateHow
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Square Footage Calculator

Calculate area for construction and design

Select Shape

Measurements

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📚 Examples, Rules & Help

⚡Quick Examples - Try These Calculations

🔍How it Works

Rectangle: Area = Length × Width

Square: Area = Side × Side

Rectangle Border: Area = (Outer Length × Outer Width) - (Inner Length × Inner Width)

Circle: Area = π × Radius² (π ≈ 3.14159)

Circle Border: Area = π × (Outer Radius² - Inner Radius²)

Annulus (Ring): Area = π × (Outer Radius² - Inner Radius²)

Triangle: Area = ½ × Base × Height

Trapezoid: Area = ½ × (Base₁ + Base₂) × Height

Parallelogram: Area = Base × Height

Sector: Area = (θ/360°) × π × r² (where θ is angle in degrees)

🔄Unit Conversions

Imperial Units

• 1 sq ft = 144 sq in

• 1 sq yd = 9 sq ft

• 1 sq yd = 1,296 sq in

Metric Units

• 1 sq m = 10,000 sq cm

• 1 sq m = 10.764 sq ft

• 1 sq ft = 0.0929 sq m

Quick Conversions

• 1 sq yd ≈ 0.836 sq m

• 1 sq m ≈ 1.196 sq yd

• 1 acre = 4,840 sq yd

Common Values

• 100 sq ft ≈ 9.29 sq m

• 1,000 sq ft ≈ 92.9 sq m

• 1 sq m ≈ 1.55 sq yd

🌍Real-World Applications

🏗️Construction & Renovation
Flooring Installation
Calculate square footage for hardwood, tile, or carpet materials with 10% waste factor
Paint Coverage
Determine paint needed - typically 1 gallon covers 350-400 sq ft
🏠Real Estate & Planning
Property Valuation
Calculate total square footage for real estate listings and cost per sq ft analysis
Room Planning
Plan furniture placement and HVAC system sizing based on room area

💡Calculator Tips & Tricks

Pro Tip:Always add 10% extra for waste when buying materials
Accuracy:Use decimal measurements (e.g., 12.5 ft) for precision
Complex Shapes:Break irregular areas into simple shapes and add them

❓Frequently Asked Questions

How much flooring do I need for a 12×15 room?

For a 12×15 ft room, you need 180 sq ft of flooring. Add 10% for waste, so order about 198 sq ft.

How do I calculate paint coverage?

Most paint covers 350-400 sq ft per gallon. Calculate wall area (subtract doors/windows) and divide by coverage rate.

What about irregular shaped rooms?

Break the room into rectangles, triangles, and circles. Calculate each area separately and add them together.

How do I measure square footage in a house?

Step 1: Measure each room's length and width in feet using a tape measure.

Step 2: Multiply length × width for each room to get square footage.

Step 3: Add all room areas together for total house square footage.

How do I calculate the total cost of materials?

Use the "Price per Square Foot" field at the bottom of the measurements section.

Example: For 300 sq ft of flooring at $8.50 per sq ft, enter "8.50" in the price field to get a total cost of $2,550.00.

🎯Common Use Cases

🏠 Home Improvement

  • • Hardwood flooring
  • • Ceramic tiles
  • • Wall painting
  • • Carpet installation

🏗️ Construction

  • • Foundation sizing
  • • Concrete slabs
  • • Roofing materials
  • • Insulation needs

🌱 Landscaping

  • • Sod installation
  • • Mulch coverage
  • • Garden planning
  • • Deck sizing
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