Square Footage Calculator — Calculate Area in Square Feet
Quickly calculate the area of a space in square feet. Enter length and width in your preferred unit and get results in sq ft, sq m, sq yd, and acres. See also our Area Calculator and Flooring Calculator.
Formula: Area = Length × Width (with unit conversion to square feet)
How to Calculate Square Footage
- Measure the length of the area in your chosen unit.
- Measure the width of the area in the same unit.
- Select the measurement unit from the dropdown.
- Click Calculate to get the area in square feet and other units.
- For irregular spaces, divide into rectangles and add the results.
Formula
Area (sq ft) = Length (ft) × Width (ft)
Unit Conversions:
1 foot = 0.3048 meters
1 inch = 0.0254 meters
1 yard = 0.9144 meters
1 cm = 0.01 meters
1 sq ft = 0.092903 sq m
1 acre = 43,560 sq ftExample Calculation
A room measures 20 feet long and 15 feet wide:
Area = 20 × 15 = 300 sq ft
= 27.87 m² = 33.33 yd² = 0.006887 acres
Common Room Sizes Reference Table
| Room Size (ft) | Square Feet | Square Meters | Square Yards |
|---|---|---|---|
| 10 × 10 | 100 | 9.29 | 11.11 |
| 10 × 12 | 120 | 11.15 | 13.33 |
| 12 × 12 | 144 | 13.38 | 16.00 |
| 12 × 14 | 168 | 15.61 | 18.67 |
| 14 × 16 | 224 | 20.81 | 24.89 |
| 15 × 20 | 300 | 27.87 | 33.33 |
| 20 × 20 | 400 | 37.16 | 44.44 |
| 20 × 30 | 600 | 55.74 | 66.67 |
Frequently Asked Questions
How many square feet are in an acre?
One acre contains exactly 43,560 square feet. This is equivalent to approximately 4,047 square meters or 4,840 square yards.
How do I convert square feet to square meters?
Multiply the area in square feet by 0.092903 to get square meters. For example, 300 sq ft × 0.092903 = 27.87 m².
How do I calculate square footage of an irregular room?
Divide the room into smaller rectangular sections, calculate the square footage of each section separately, then add all the areas together.
What is the difference between square feet and linear feet?
Linear feet measures length in one direction only. Square feet measures area (length × width) and represents two-dimensional space.
How many square feet do I need for flooring?
Measure the length and width of each room, calculate the square footage, then add 10% extra for waste and cuts. This gives you the total flooring material needed.