Square Footage Calculator
Accurately measure area for flooring, paint, and renovation projects.
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Calculation Results:
Total Area: 0 sq ft
Estimated Material Cost: $0.00
How to Calculate Square Feet
Square footage is a measurement of area, typically used to determine the size of a room or a piece of land. Calculating it correctly is essential for purchasing materials like flooring, carpet, or sod, ensuring you don't overbuy or run short.
The Basic Formula
For a standard rectangular or square area, the formula is simple:
Length (ft) × Width (ft) = Total Square Feet (sq ft)
Dealing with Inches
Most rooms aren't measured in perfect foot increments. To calculate accurately with inches, you must first convert the inches to a decimal of a foot by dividing by 12.
- Example: If a wall is 10 feet 6 inches long.
- Divide 6 by 12 = 0.5.
- Total Length = 10.5 feet.
Example Calculation
Imagine you are tiling a kitchen that is 12 feet 4 inches long and 10 feet wide.
- Convert Length: 4″ / 12 = 0.33. Total length = 12.33 ft.
- Multiply: 12.33 ft × 10 ft = 123.3 sq ft.
- Wastage: Usually, you should add 10% for cuts and mistakes. 123.3 × 1.10 = 135.63 sq ft total to order.
Common Measurements and Their Square Footage
| Standard Room | Average Dimensions | Est. Sq Ft |
|---|---|---|
| Small Bathroom | 5′ x 8′ | 40 sq ft |
| Master Bedroom | 14′ x 16′ | 224 sq ft |
| Two-Car Garage | 20′ x 20′ | 400 sq ft |