Square Footage Calculator

1. Select your preferred measurement unit (Feet or Meters).
2. Enter a name for each room or space (optional).
3. Enter the length and width of the room.
4. Click "Add Room" to include additional rooms or areas.
5. The total area and per-room breakdown are calculated automatically.

What is Square Footage?

Square footage is a measurement of area expressed in square feet (sq ft). It is calculated by multiplying the length of a space by its width. Square footage is the standard unit of area measurement in real estate, construction, and interior design in the United States. In metric countries, the equivalent measurement is square meters (sq m), where 1 square meter equals approximately 10.764 square feet. This calculator supports both units and provides instant conversion between them, making it useful for international property comparisons and material estimates.

How to Calculate Area

For rectangular rooms, simply multiply length by width. A room measuring 12 feet by 10 feet has an area of 120 square feet. For irregularly shaped rooms, divide the space into rectangular sections, calculate each section's area separately, and add them together. For example, an L-shaped room can be split into two rectangles. This tool lets you add multiple rooms and calculates the total area across all of them, which is especially useful when estimating materials for an entire home or office.

Common Use Cases

• Estimating flooring materials (tile, hardwood, carpet) for renovation
• Calculating paint coverage for walls and ceilings
• Determining the size of a property for real estate listings
• Sizing HVAC systems based on total conditioned area
• Comparing property values on a price-per-square-foot basis
• Planning furniture layout by measuring available floor space

Material Estimation Tips

When purchasing flooring or tile, add 10 to 15 percent to your calculated square footage to account for cuts, waste, and mistakes during installation. For paint, one gallon typically covers 350 to 400 square feet with one coat, so divide your total wall area by 375 and round up to estimate the number of gallons needed. For carpet, suppliers usually sell by the square yard (1 sq yd = 9 sq ft), so divide your square footage by 9. Always double-check measurements before ordering materials, as returns on cut materials are often not accepted.

For unit conversions, use the Feet to Meters converter or the general Unit Converter. For percentage-based calculations, try the Percentage Calculator.