Use this free square footage calculator to calculate square feet for rooms, flooring, carpet, tile, paint, roofing, yards, landscaping, real estate, and home improvement projects. Enter your measurements in feet and inches, choose the shape or calculator type, and get instant square footage, conversions, material estimates, and cost estimates.
Calculate square footage of a room or area by selecting a shape and entering measurements.
Add bedrooms, living rooms, hallways, closets, or other spaces to calculate total house square footage or project area.
Estimate flooring, carpet, tile, hardwood, laminate, vinyl plank, and rug square footage with optional waste, price, and box coverage.
For flooring, many homeowners add 5% to 15% extra material for cuts, waste, mistakes, and future repairs. Complex rooms, diagonal patterns, or tile layouts may require more extra material.
Estimate wall area, paintable square footage, number of coats, and gallons of paint needed.
Paint coverage varies by paint brand, wall texture, primer, color change, and surface condition. Always check the paint can label for exact coverage.
Estimate roof area, roofing squares, waste, and optional roofing cost for general planning.
This roofing estimate is for general planning only. Actual roof area can vary based on pitch, overhangs, dormers, valleys, hips, skylights, and roof complexity.
Calculate lawn, sod, artificial turf, garden bed, patio, paver, mulch, driveway, or walkway area.
Calculate total project cost or reverse-calculate price per square foot for flooring, tile, carpet, painting, landscaping, cleaning, construction, and real estate.
To calculate square footage, multiply the length by the width. For example, a room that is 12 feet long and 10 feet wide is 120 square feet. This simple square feet calculator can help with rooms, flooring, paint, roofing, yards, landscaping, and real estate planning.
Formula: Square Feet = Length × Width
When measurements include inches, convert inches into feet before multiplying. For example, 6 inches equals 0.5 feet and 3 inches equals 0.25 feet.
| Shape | Formula |
|---|---|
| Rectangle | Length × Width |
| Square | Side × Side |
| Triangle | Base × Height ÷ 2 |
| Circle | π × Radius² |
| Trapezoid | (Base 1 + Base 2) × Height ÷ 2 |
| L-Shaped Room | Rectangle 1 Area + Rectangle 2 Area |
A flooring square footage calculator helps you measure hardwood, laminate, vinyl plank, tile, carpet, rugs, and other flooring materials. Measure the room length and width, multiply them together, then add extra material for cuts, waste, mistakes, and future repairs.
For carpet square footage, tile square footage, and flooring boxes, it is common to add 5% to 15% waste. Complex rooms, closets, diagonal layouts, patterned tile, stairs, and irregular walls may require more material. Always round up when buying flooring boxes.
Example: A 12 ft by 15 ft room is 180 sq ft. If you add 10% waste, you need 198 sq ft of flooring.
A paint square footage calculator estimates wall area by multiplying wall width by wall height. Then multiply by the number of walls and the number of coats. Doors and windows can be subtracted from the paintable area.
Paint coverage per gallon may vary by paint brand, surface texture, primer, color change, and wall condition. Many paint cans estimate around 350 square feet per gallon, but you should check the label for exact coverage.
Example: A wall that is 12 ft wide and 8 ft tall is 96 sq ft. Four similar walls would be 384 sq ft before subtracting doors and windows.
Roof area is different from floor area because roof pitch increases the surface area. Roofing contractors often use roofing squares, where 1 roofing square equals 100 square feet. Waste is often added for cuts, installation, valleys, hips, and roof complexity.
This roofing square footage calculator provides a general planning estimate. Actual roof measurements should be confirmed by a qualified roofing professional, especially for homes with dormers, skylights, overhangs, complex slopes, or multiple roof sections.
Use the yard square footage calculator to estimate lawn, garden bed, patio, driveway, walkway, paver, sod, artificial turf, grass seed, and mulch planning areas. For larger properties, square feet can also be converted into acres.
For irregular outdoor spaces, divide the area into smaller rectangles, triangles, or circles, calculate each area separately, and add the totals together.
A house square footage calculator can help estimate finished living area, but real estate measurements can differ based on listing rules, appraisal methods, local standards, and property type. Finished above-grade living area is often treated differently from basement square footage, garage square footage, porches, decks, patios, and unfinished spaces.
For listings, appraisals, legal documents, or home sales, confirm professional measurement standards in your area before relying on any calculator result.
| Room Size | Square Feet |
|---|---|
| 8 × 10 | 80 sq ft |
| 10 × 10 | 100 sq ft |
| 10 × 12 | 120 sq ft |
| 12 × 12 | 144 sq ft |
| 12 × 15 | 180 sq ft |
| 15 × 20 | 300 sq ft |
| 20 × 20 | 400 sq ft |
| 20 × 30 | 600 sq ft |
| Square Feet | Square Yards | Square Meters | Acres |
|---|---|---|---|
| 100 | 11.11 | 9.29 | 0.0023 |
| 250 | 27.78 | 23.23 | 0.0057 |
| 500 | 55.56 | 46.45 | 0.0115 |
| 1,000 | 111.11 | 92.90 | 0.0230 |
| 5,000 | 555.56 | 464.52 | 0.1148 |
| 43,560 | 4,840 | 4,046.86 | 1 |
Multiply the length by the width. For example, a 12 ft by 10 ft room is 120 square feet.
A 10x10 room is 100 square feet.
A 12x12 room is 144 square feet.
Convert inches into feet first, then multiply length by width. For example, 6 inches equals 0.5 feet.
Many projects add 5% to 15% extra material for cuts, waste, mistakes, and future repairs.
Multiply wall width by wall height, multiply by the number of walls, subtract doors and windows, and multiply by the number of coats.
A roofing square equals 100 square feet.
One acre equals 43,560 square feet.
Garages are usually not counted as finished living area, but rules may vary depending on local real estate and appraisal practices.
Finished basement space may be reported separately from above-grade living area. Users should confirm local standards for real estate listings and appraisals.
