Square Footage Calculator
Estimate the area of common shapes and get cost per square foot
Square Footage Calculator
Estimate the square footage of common shapes. Modify values and click "Calculate" to use.
🟥Rectangle
Formula
area = length × width
Result
⬛Rectangle Border
Formula
area = l × w − inner area
Result
⚪Circle
Formula
area = π × r^2
Result
⭕Ring
Formula
area = π(R^2 − r^2)
Result
🔺Triangle with Edge Lengths
Formula
area = √(s(s − a)(s − b)(s − c)), where s = (a + b + c) / 2
Result
🔻Triangle with Base & Height
Formula
area = (base × height) / 2
Result
🔶Trapezoid
Formula
area = (b1 + b2) × h / 2
Result
🧩Sector
Formula
area = (θ/2) × r^2 (θ in radians)
Result
💠Parallelogram
Formula
area = base × height
Result
Reference
1 acre = 43,560 square foot
1 square yard = 9 square foot
1 square meter = 10.76 square foot
1 square inch = 0.00064516 square foot
Calculating Cost Per Square Foot
When painting a house, installing flooring, or building a home, the square footage of the property is often used to determine the cost or materials to be used.
Painting a house
Professional house painters often base price quotations on the square footage of a property... primer generally covers less area than paint, and estimated coverage amounts can range from anywhere between 200-400 square feet per gallon.
Flooring installation
There are a number of materials commonly used for flooring, including wood, laminate, and tile. Flooring costs can vary significantly depending on the quality and choice of materials.
Wood Flooring
Hardwood flooring is highly durable, easy to clean... Engineered hardwood has higher heat and moisture resistance than solid hardwoods...
Laminate Flooring
Laminate flooring is typically made with plywood or fiberboard with a plastic laminate top layer... However, laminate flooring often feels too hard on the feet...
Tile flooring
Tile flooring includes concrete or cement, ceramic tiles, glass tiles, and natural stone products among many others... Tile installation is also difficult, and installation costs can be more expensive than the cost of the materials.
Building a home
When building a home, using building plans and visiting different homes as a reference can help a person to gain a better understanding of what square footages work for their preferences.
The cost of building a home varies largely based on many factors... Instead, it may be more helpful to get an estimate from a builder and divide that estimate by the square footage.