Square Footage Calculator

Square

Rectangle

Rectangle Border

Circle

Circle Ring

Annulus

Triangle

Trapezoid

How to Use the Calculator

You can use this tool to determine the area in various units such as square feet, square inches, square yards, square meters, and acres. It’s ideal for different projects like building, gardening, or flooring. Here are some key features:

• Calculate Area: Enter the dimensions of your space to find the total area needed. This helps in planning projects like landscaping, carpeting, or tiling.
• Cost Estimation: Input the price for materials based on unit area. For example:
  • $3.00 per square foot means you pay $3.00 for each square foot.
  • $25.00 per 1,000 square feet means the cost is $25 for 1,000 square feet.
• Bulk Material Volume: For larger materials, such as mulch or gravel, use a different calculator to find cubic yards or cubic meters.
• Measurements: You can enter values in either US or metric units. Acceptable units include:
  • Inches (in)
  • Feet (ft)
  • Yards (yd)
  • Millimeters (mm)
  • Centimeters (cm)
  • Meters (m)

Enter decimal values for more precise calculations. For instance, the measurement 7’3″ can be entered as 7.25 feet. Similarly, 245 cm converts to 2.45 m.

How to Calculate Square Footage

Measure

• Start by measuring the sides of the area you want to calculate. Use a tape measure for accuracy.

Convert all of your measurements to feet

• If your measurements are already in feet, you can go directly to “Calculate the Area as Square Footage.”
• If you have measurements in feet and inches, you can convert them to feet by following these steps:
  • Divide the inches by 12 to get the feet value.
  • Add this value to your feet measurement.
• For measurements in other units, use these conversions to get your values in feet:
  • Inches: Divide by 12.
  • Yards: Multiply by 3.
  • Centimeters: Multiply by 0.03281.
  • Meters: Multiply by 3.281.

Calculate the Area as Square Footage

• For rectangular or square areas, multiply the length by the width:
  • Area (ft²) = Length x Width
• For irregular shapes, divide the area into simpler rectangular or square sections. Calculate each area separately, then add them together to find the total area.

Here’s a quick formula summary:

By following these steps, you can easily determine the square footage of any space you are working with.

Convert between Square Inches, Square Feet, Square Yards, and Square Meters

When measuring area, you can start with units like inches or centimeters and perform your calculations in square inches or square centimeters. Once you have your area calculated, you can easily convert it to square feet or square meters.

Here are the conversion factors you need:

• To convert Square Feet (ft²):
  • To Square Inches (in²): Multiply by 144.
  • To Square Yards (yd²): Multiply by 0.11111.
  • To Square Meters (m²): Multiply by 0.092903.
• To convert Square Yards (yd²):
  • To Square Feet (ft²): Multiply by 9.
  • To Square Meters (m²): Multiply by 0.836127.
• To convert Square Meters (m²):
  • To Square Inches (in²): Multiply by 1,550.
  • To Square Feet (ft²): Multiply by 10.7639.
  • To Square Yards (yd²): Multiply by 1.19599.

Use these factors to switch between area measurements as needed.

Area Formulas and Illustrations for Various Shapes

Square Area

To find the area of a square, you can use this formula:

Area (ft²) = Side Length × Side Length

Rectangle Area

To calculate the area for a rectangle, apply this formula:

Area (ft²) = Length × Width

Rectangle Border Area

For a rectangle with a border, calculate the areas as follows:

• Inner Area (ft²) = Length × Width
• Total Area (ft²) = (Length + (2 × Border Width)) × (Width + (2 × Border Width))
• Area (ft²) = Total Area – Inner Area

Circle Area

Calculate the area of a circle with this formula:

Area (ft²) = π × (Diameter/2)²
(Use π ≈ 3.14)

Circle Border Area

For the area of a circular border, follow these steps:

1. Outer Diameter = Inner Diameter + (2 × Border Width)
2. Outer Area (ft²) = π × (Outer Diameter/2)²
3. Inner Area (ft²) = π × (Inner Diameter/2)²
4. Area (ft²) = Outer Area – Inner Area

(Use π ≈ 3.14)
This formula is similar to that of the annulus.

Annulus Area

To find the area of an annulus, use the following:

1. Outer Area (ft²) = π × (Outer Diameter/2)²
2. Inner Area (ft²) = π × (Inner Diameter/2)²
3. Area (ft²) = Outer Area – Inner Area

(Use π ≈ 3.14)

Triangle Area

To determine the area of a triangle, you can use:

Area (ft²) = (1/4) × √[(a+b+c) × (b+c-a) × (c+a-b) × (a+b-c)]

Trapezoid Area

For the area of a trapezoid, use this formula:

Area (ft²) = ((a + b) / 2) × h