Loading...
Calculate area for rooms, flooring, and paint. Includes material estimates and cost calculator.
Square footage is a measurement of area expressed in square feet (sq ft), calculated by multiplying the length and width of a space. It is commonly used in real estate, flooring, and construction.
Formula: Length × Width = Area
| Room Type | Sq Ft | Dimensions |
|---|---|---|
| Small Bedroom | 100 | 10 × 10 ft |
| Average Bedroom | 132 | 11 × 12 ft |
| Master Bedroom | 200 | 14 × 14 ft |
| Living Room | 250 | 16 × 16 ft |
| Single Garage | 200 | 10 × 20 ft |
| Two-Car Garage | 400 | 20 × 20 ft |
| Small Kitchen | 100 | 10 × 10 ft |
| Average Kitchen | 150 | 10 × 15 ft |
Add 10% for waste. For diagonal patterns, add 15%.
120 sq ft + 10% = 132 sq ft needed
1 gallon covers ~350-400 sq ft. Two coats recommended.
120 sq ft ÷ 350 = 0.34 gallons (1 coat)
Add 10-15% for cuts and breakage.
Formula
Rectangle: A = L × W | Circle: A = π × r² | Triangle: A = ½ × B × HL = length (in the same unit as width)
W = width
r = radius of the circle
B = base of the triangle
H = height of the triangle
Worked Example
Living room 16 ft × 16 ft, convert to sq m
Did you know? The U.S. Census Bureau reports the median new single-family home is 2,299 sq ft — nearly double the 1,200 sq ft average from 1970.
Sources
Calculate heating and cooling BTU needs by room size, insulation, and windows.
Estimate cubic yards of concrete needed with bag counts and cost estimate.
Calculate deck boards, joists, and fasteners needed with waste factor.
Estimate drywall sheets needed for walls and ceilings with tape and screw counts.
Calculate appliance energy costs by wattage, usage hours, and electricity rate.
Calculate posts, rails, and pickets needed for your fence project.