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Square Footage Calculator

Calculate square footage for rooms and spaces. Get paint and flooring estimates for your project.

How to Calculate Square Footage

Square footage is area measured in square feet. It's essential for flooring, painting, and real estate.

Area Formulas

  • Rectangle: Length × Width
  • Triangle: ½ × Base × Height
  • Circle: π × Radius²

Measuring Tips

  • Measure to the nearest inch
  • For irregular rooms, divide into simple shapes
  • Include closets and alcoves
  • Measure from wall to wall

Common Uses

  • Flooring: Order 10% extra for cuts and waste
  • Paint: 350-400 sqft per gallon, plan for 2 coats
  • HVAC: Proper sizing depends on square footage
  • Real estate: Price per sqft comparisons

Conversions

  • 1 square foot = 0.0929 square meters
  • 1 acre = 43,560 square feet
  • 1 square yard = 9 square feet

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Frequently Asked Questions

How do I calculate square footage?

Multiply length by width for rectangles. For irregular rooms, divide into rectangles, calculate each, and add together.

How do I convert sqft to sqm?

Multiply square feet by 0.0929 to get square meters. Or divide sqft by 10.764.

How much paint do I need?

One gallon covers about 350-400 sqft. For two coats, double the area and divide by coverage.

How much flooring should I order?

Calculate the area and add 10% for cuts and waste. Order extra for future repairs.