1. Select your shape
Choose from rectangle, circle, triangle, trapezoid, L-shape, annulus, or wall-and-window layouts to match your project.
What is garage square footage?
Garage square footage is the total floor area of a garage measured in square feet. To find garage square footage, measure the interior length and width in feet and multiply them together. Garage square footage is used for epoxy coating estimates, floor tile calculations, storage planning, and property appraisals.
Getting started
How to Calculate Garage Square Footage
To calculate garage square footage, measure the interior length and width of the garage in feet and multiply. A standard single-car garage is typically 12x20 ft (240 sq ft), and a two-car garage is typically 20x20 ft (400 sq ft) or 24x24 ft (576 sq ft).
2. Enter your measurements
Input dimensions in feet, inches, yards, meters, or centimeters. The Square Foot Calculator converts units automatically.
3. Get area and cost
View results in square feet, square yards, square meters, and acres. Add a material price per unit to estimate total project cost.
Quick reference
Reference
1 acre = 43,560 square feet
1 square yard = 9 square feet
1 square meter = 10.764 square feet
1 square inch = 0.00064516 square feet
Material pricing
Calculate Cost of Materials
Enter the price per square foot of material to estimate total cost. The calculator accepts pricing in square feet, square inches, square yards, or square meters and converts to the correct total based on your area.
There are 2 steps to calculate material cost:
- Enter the price per unit area. For tiling projects, enter the price per box and the number of square feet each box covers. For carpet, enter the cost per square yard. For flooring installation with hardwood or laminate, enter the cost per square foot.
- Select the unit of area that matches your pricing. The Square Foot Calculator multiplies your total area by the unit price to produce an estimated material cost, including labor costs when added to the per-unit price.
To calculate the volume of bulk materials like mulch or gravel for landscaping, convert area to cubic yards or cubic meters by multiplying the area by the depth of material.
Core formula
Basic Formula for Area
Area is the amount of space occupied by a 2-dimensional shape. The shape could be a floor, a wall, a playground, or a field. The simplest formula for area applies to any rectangular shape:
Area = Length × Width
Measure the length and width of the space in feet. Multiply the two values to get the area in square feet. A rectangular room that is 12 feet (3.66 meters) long and 10 feet (3.05 meters) wide has an area of 120 sq ft (11.15 sq m).
Square yardage is area measured in yards, and square meters is area measured in meters. Measure in feet, find the area in square feet, then convert to the unit you need.
For an L-shape room, split the floor into 2 rectangular sections, calculate each area, and add the results. Convert all measurements to the same unit before multiplying, if your dimensions are in different units like inches and feet.
Basic Length Conversion
Convert other units of measure to feet with these 4 formulas:
| From | To Feet | Formula |
|---|---|---|
| Inches | Feet | Divide by 12 |
| Yards | Feet | Multiply by 3 |
| Meters | Feet | Multiply by 3.28084 |
| Centimeters | Feet | Divide by 30.48 |
For example, 48 inches ÷ 12 = 4 feet. A measurement of 5 meters × 3.28084 = 16.40 feet. The Square Foot Calculator handles these conversions automatically when you select the input unit.
Unit conversion
Area Conversion
Measure your space in inches or centimeters, calculate area in square inches or square centimeters, then convert to any unit you need, including square feet, square yards, square meters, or acres.
| Unit | Square Feet Equivalent |
|---|---|
| 1 sq ft | 144 sq in |
| 1 sq yd | 9 sq ft |
| 1 sq m | 10.764 sq ft |
| 1 acre | 43,560 sq ft |
A 300 sq ft room equals 33.33 sq yd, 27.87 sq m, or 43,200 sq in. The Square Footage Calculator displays all conversions at once so you can compare units for flooring, carpet, or tiling projects without manual math.
Shape formulas
Area Formulas for Different Shapes
The Square Foot Calculator supports 11 shape formulas for construction, interior design, landscaping, and flooring projects. Each formula below includes a diagram with labeled dimensions.
Rectangle Shape
Calculate square foot of a rectangle
Using measurements in feet: Area (ft²) = Length × Width. This is the most common formula for calculating square footage of a rectangular room, floor, wall, or field. A room 15 feet (4.57 meters) long and 12 feet (3.66 meters) wide has a Rectangle Area of 180 sq ft (16.72 sq m).
Room Shape
Calculate square foot of a room
Using measurements in feet: Area (ft²) = Room Length × Room Width. Measure the longest wall for length and the perpendicular wall for width. A standard rectangular room that is 12 feet (3.66 meters) long and 10 feet (3.05 meters) wide has an area of 120 sq ft (11.15 sq m). Door and window openings do not reduce floor area because the floor extends under the opening. For rooms with closets or alcoves, measure each rectangular section separately and add the areas together.
Waste factor
Adding 10% Surplus for Materials
Add a 10% surplus to your calculated area to account for material waste during cutting, breakage, and pattern matching. This waste factor applies to flooring, carpet, tiling projects, and landscaping materials.
Original Area
100 sq ft
+10%
Order Amount
110 sq ft
Total Material = Area × 1.10
A room with 200 sq ft of floor area needs 220 sq ft of material: 200 × 1.10 = 220 sq ft. Increase the surplus to 15% (multiply by 1.15) for diagonal flooring installation patterns or complex tiling projects with many cuts. The Square Foot Calculator includes a waste factor field for this calculation.
FAQ
Frequently Asked Questions
How do I calculate garage square footage?
Measure the interior length and width in feet and multiply. A 20x20 ft garage is 400 square feet. Measure from wall to wall, not including the wall thickness.
How many square feet is a 2-car garage?
A standard 2-car garage is 400-576 square feet (20x20 to 24x24 ft). Larger 2-car garages with workshop space can be 600-800 sq ft.
How much epoxy do I need for my garage floor?
One gallon of epoxy typically covers 200-250 sq ft. A 400 sq ft 2-car garage needs about 2 gallons of epoxy coating. Most kits include enough for 200-500 sq ft.
How many square feet is a 1-car garage?
A standard 1-car garage is 200-260 square feet (10x20 to 12x22 ft). This provides space for one vehicle with minimal storage.
How much does garage flooring cost per square foot?
Epoxy coating costs $3-7/sq ft, interlocking tiles cost $2-8/sq ft, and rubber matting costs $3-10/sq ft. A 400 sq ft garage floor epoxy project typically costs $1,200-2,800 installed.
Does garage square footage count in home appraisals?
No, garage space is typically not included in a home's total living area square footage. However, garage size is listed separately and does add to overall property value.