Rectangle Square Foot Calculator

Q: How do I calculate the square footage of a rectangle?

Multiply the length by the width. Both measurements should be in feet. A rectangle 20 feet long and 15 feet wide has an area of 300 square feet.

Q: What is the formula for rectangle area?

Area = Length x Width. This formula works for any rectangular shape including rooms, floors, walls, lots, and garden beds.

Q: How do I convert rectangle dimensions from inches to feet?

Divide inches by 12 to convert to feet. For example, 48 inches / 12 = 4 feet. Then multiply length by width in feet for square footage.

Q: How many square feet is a 20x30 rectangle?

A 20x30 rectangle is 600 square feet (20 ft x 30 ft = 600 sq ft). That equals 66.67 square yards or 55.74 square meters.

Q: Can I use this for wall measurements?

Yes, walls are rectangular. Measure the wall width and height, multiply for total wall area. Subtract any windows or doors for paintable surface area.

What is rectangle square footage?

Rectangle square footage equals length times width. Multiply length × width in feet for area. A 20 × 15 ft (6.1 × 4.57 m) rectangle has 300 sq ft (27.87 m²). For a rectangle with a frame, use the rectangle border calculator.

Getting started

How to Calculate Rectangle Square Footage

To calculate rectangle square footage, measure both sides in feet and multiply length × width. The formula works for any rectangular space, including rooms, garden beds, fences, and patios. For non-rectangular spaces, use the triangle or L-shape calculator instead.

1. Measure both sides

Measure length and width of the rectangle in feet using a tape measure.

2. Apply length × width

Rectangle area = length × width. A 20 × 15 ft rectangle has 300 sq ft.

3. Use for any rectangle

Apply rectangle area to floors, walls, garden beds, patios, or fence panels.

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

Rectangle area times price per unit equals material cost. Enter the price per square foot, square yard, or square meter for any rectangular project.

There are 2 steps to calculate material cost:

Enter the price per square foot of the material covering the rectangle.
The Square Foot Calculator multiplies rectangle area by your price for the material total.

Add a 5-10% waste factor for cuts and pattern matching when ordering materials.

FAQ

Frequently Asked Questions

How do I calculate the square footage of a rectangle?

Multiply the length by the width. Both measurements should be in feet. A rectangle 20 feet long and 15 feet wide has an area of 300 square feet.

What is the formula for rectangle area?

Area = Length x Width. This formula works for any rectangular shape including rooms, floors, walls, lots, and garden beds.

How do I convert rectangle dimensions from inches to feet?

Divide inches by 12 to convert to feet. For example, 48 inches / 12 = 4 feet. Then multiply length by width in feet for square footage.

How many square feet is a 20x30 rectangle?

A 20x30 rectangle is 600 square feet (20 ft x 30 ft = 600 sq ft). That equals 66.67 square yards or 55.74 square meters.

Can I use this for wall measurements?

Yes, walls are rectangular. Measure the wall width and height, multiply for total wall area. Subtract any windows or doors for paintable surface area.

How do I calculate square footage for multiple rectangles?

Calculate each rectangle separately and add the areas together. Use the quantity field to multiply if all rectangles are the same size.

REFERENCES

Rectangle Square Foot
Calculator — Length × Width

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