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Calculate square footage for flooring, painting, roofing, and land measurement. Get accurate area calculations with instant cost estimation and unit conversions.
Select shape and enter measurements
Mathematical formulas used for calculations
When to use this calculator
Calculate area for rectangles, circles, triangles, trapezoids, and complex multi-room layouts with precision.
Get instant cost calculations for flooring, painting, and roofing materials with customizable pricing.
Convert between square feet, meters, yards, acres, and hectares instantly for any measurement.
Automatically add 10-15% wastage for accurate material ordering and avoid running short.
Add multiple rooms or sections to calculate total square footage for entire homes or buildings.
Use on any device - desktop, tablet, or mobile - for on-site measurements and calculations.
Square footage is a unit of area measurement representing the size of a two-dimensional space. One square foot equals a square with sides measuring one foot each (12 inches × 12 inches). It's the standard measurement for real estate, flooring, painting, roofing, and construction projects in the United States. Understanding square footage helps estimate material costs, compare property sizes, and plan home improvement projects accurately. This measurement system is based on the imperial system and is widely used by contractors, real estate professionals, and homeowners for practical applications.
Common Shape Formulas:
Converting between square feet and square meters is essential for international projects or comparing measurements:
Conversion Formulas:
For land measurement and real estate, converting square feet to acres is common:
Land Measurement Conversions:
| Room Type | Typical Size | Square Footage |
|---|---|---|
| Small Bedroom | 10' × 10' | 100 sq ft |
| Master Bedroom | 15' × 15' | 225 sq ft |
| Living Room | 16' × 20' | 320 sq ft |
| Kitchen | 10' × 12' | 120 sq ft |
| Bathroom | 5' × 8' | 40 sq ft |
| Garage (1-car) | 12' × 20' | 240 sq ft |
Standard Coverage Guidelines:
Note: These are industry-standard estimates. Actual coverage may vary based on material type, surface condition, and installation method. Always consult product specifications and consider ordering extra material.
| Square Feet | Square Meters | Square Yards | Acres |
|---|---|---|---|
| 100 sq ft | 9.29 sq m | 11.11 sq yd | 0.0023 acres |
| 500 sq ft | 46.45 sq m | 55.56 sq yd | 0.0115 acres |
| 1,000 sq ft | 92.90 sq m | 111.11 sq yd | 0.0230 acres |
| 2,000 sq ft | 185.81 sq m | 222.22 sq yd | 0.0459 acres |
| 5,000 sq ft | 464.52 sq m | 555.56 sq yd | 0.1148 acres |
| 10,000 sq ft | 929.03 sq m | 1,111.11 sq yd | 0.2296 acres |
| 43,560 sq ft | 4,046.86 sq m | 4,840 sq yd | 1.0 acre |
Calculate exact flooring material needed for hardwood, laminate, tile, carpet, or vinyl. Add 10-15% wastage for cuts and mistakes. Compare costs between different flooring types by adjusting price per square foot.
Determine wall area for painting projects. Calculate paint quantity needed based on coverage rate (350-400 sq ft per gallon). Account for multiple coats and subtract door/window areas for accuracy.
Estimate roofing materials like shingles, tiles, or metal roofing. Measure roof sections, apply pitch factor, and add 10-15% wastage for overlaps and cuts. Get accurate material costs for budgeting.
Convert property sizes between square feet, acres, and hectares. Perfect for real estate listings, land purchases, or agricultural planning. Compare lot sizes easily with instant conversions.
Calculate total living space for property listings. Measure individual rooms and sum for total square footage. Essential for appraisals, pricing, and comparing properties.
Plan home improvement projects with accurate measurements. Calculate materials for multiple rooms, estimate costs, and create detailed budgets. Track square footage for permits and contractors.
Use a quality tape measure and measure twice to ensure accuracy. For best results, measure in feet and inches, then convert to decimal feet (e.g., 12 ft 6 in = 12.5 ft). Measure at floor level for flooring and at wall height for painting.
Always add 10-15% wastage for flooring and roofing materials. Tile and diagonal patterns need 15% wastage. Straight-lay hardwood or laminate needs 10%. Complex rooms with many corners may need up to 20% wastage.
For patterned flooring, wallpaper, or tile, add extra material for pattern matching. Large patterns may require 20-25% extra. Always order from the same batch to ensure color consistency.
For flooring, include doorway transitions in your measurements. For painting, subtract door areas (approximately 20 sq ft per door) and window areas (15 sq ft per standard window) from wall calculations.
Verify all measurements before ordering materials. Have a second person check your calculations. For large projects, consider hiring a professional measurer to ensure accuracy and avoid costly mistakes.
For best accuracy, use a laser distance measurer for large rooms or outdoor spaces. Digital tools eliminate human error and provide instant measurements. Always round up to the nearest full unit when ordering materials.
To calculate square footage of a rectangular room, multiply the length by the width. For example, a room that is 15 feet long and 12 feet wide has 180 square feet (15 × 12 = 180). For irregular shapes, divide the space into rectangles, calculate each area separately, and add them together. Our calculator supports rectangle, circle, triangle, trapezoid, and complex multi-room calculations.
Measure your room's length and width in feet, multiply them to get square footage, then add 10-15% for wastage due to cuts and mistakes. For example, a 200 sq ft room needs 220-230 sq ft of flooring material (200 + 10-15% wastage). Our flooring calculator automatically adds wastage and calculates total cost based on material price per square foot.
To convert square feet to square meters, multiply by 0.092903. For example, 100 square feet = 9.29 square meters (100 × 0.092903). Conversely, to convert square meters to square feet, multiply by 10.764. Our calculator automatically shows conversions in square feet, square meters, square yards, acres, and hectares.
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Industry standards for residential construction and measurement practices.
Visit NAHB →Official standards for measuring and calculating residential square footage.
Visit ANSI →Measurement standards and unit conversion references.
Visit NIST →Practical guides for measuring and estimating flooring materials.
Visit Home Depot →This square footage calculator is provided as a free tool for educational and planning purposes. While we use industry-standard formulas and best practices, the results should be used as estimates for preliminary planning.
Professional Consultation: For critical applications such as commercial construction, legal property measurements, or large-scale projects, we recommend consulting with licensed professionals including contractors, architects, surveyors, or real estate appraisers who can provide certified measurements and expert guidance.
Measurement Accuracy: The accuracy of calculations depends entirely on the precision of your input measurements. Always measure carefully, double-check dimensions, and consider site-specific factors that may affect material requirements.
Material Ordering: When ordering materials, always account for wastage (typically 10-15%) and consult with suppliers about their specific product coverage rates and recommendations. Material characteristics, installation methods, and site conditions can significantly affect actual requirements.
No Warranty: CalcFinex provides this calculator "as is" without warranties of any kind. We are not liable for any decisions made based on calculator results. Users assume all responsibility for verifying calculations and consulting appropriate professionals.