Square Footage Calculator
Calculate the area in square feet for rooms, lots, and various shapes. Convert between area units.
A square footage calculator computes the area of rooms, lots, or irregularly shaped spaces from length and width measurements.
Examples
Room measurement
A 12 ft x 15 ft room = 180 sq ft. This is about 16.7 square meters.
Circular patio
A circular patio with 8 ft radius: Area = pi x 64 = 201.06 sq ft.
Frequently Asked Questions
How many square feet in an acre?
1 acre = 43,560 square feet. The calculator shows the acre equivalent for any area.
How do I measure an irregular room?
Break the room into rectangles and triangles, calculate each separately, then add the areas together. For four-sided irregular shapes, enter the four side lengths.
Result
300.00 sq ft
- Area per unit
- 300.00 sq ft
- Quantity
- 1
- Total area
- 300.00 sq ft
- Square meters
- 27.87 m²
Related Calculators
Quick Tips
- •For L-shaped rooms, calculate each rectangle separately and add them together.
- •When measuring in inches, the calculator converts to feet automatically.
- •Use the quantity field for repeating areas like identical tiles or rooms.