📐 Home Improvement & DIY Tool
Square Footage Calculator: Area & Material Cost
Measure room square footage, add waste margins, and estimate total flooring or paint costs instantly.
Measure room square footage, add waste margins, and estimate total flooring or paint costs instantly.
Whether you're shopping for hardwood flooring, purchasing turf for the yard, or determining how many gallons of paint to buy, getting an accurate square footage estimate prevents costly multiple trips to the home improvement store.
| Room Type | Typical Dimensions | Approximate Area |
|---|---|---|
| Half Bathroom | 5 ft x 6 ft | 30 sq ft |
| Small Bedroom / Office | 10 ft x 10 ft | 100 sq ft |
| Standard Master Bedroom | 14 ft x 16 ft | 224 sq ft |
| Two-Car Garage | 20 ft x 20 ft | 400 sq ft |
For any rectangular or square space, use the basic area equation:
Square Feet = Length (ft) x Width (ft)
If your room is an L-shape or irregular, divide the floor plan into two separate rectangles, calculate each area, and add them together.
Flooring and tiles are cut to fit around corners, doorways, and obstacles. A 10% waste buffer is standard for straight-lay flooring. Add 15% for diagonal patterns, herringbone layouts, or rooms with many angles where more cuts are required.
Carpet is often sold by the square yard. To convert:
Square Yards = Square Feet / 9
For example, 198 sq ft / 9 = 22 square yards of carpet needed.
Multiply length in feet by width in feet. For example, a 12 ft by 15 ft room equals 180 square feet.
Cutting around corners, trimming plank ends, and accidental damage require excess material buffer so you don't run short mid-project.
There are 9 square feet in 1 square yard. Divide your total square footage by 9 to determine carpet yardage.
Split the room into two or more rectangles. Calculate the area of each rectangle separately using Length x Width, then add all the areas together.
Yes. Calculate the total wall area (add up each wall's Length x Height), then enter a price per square foot based on your paint's coverage rate.
Basic area: L x W = sq ft
With 10% waste: sq ft x 1.10
With 15% waste: sq ft x 1.15
Sq yards: sq ft / 9
Sq meters: sq ft / 10.764
Cost: total sq ft x price per sq ft
| Straight lay hardwood | 10% |
| Carpet | 10% |
| Ceramic tile (straight) | 10% |
| Diagonal tile / herringbone | 15% |
| Vinyl plank (LVP) | 10% |
| Paint (single coat) | 0% |