Square Inches Calculator

Enter the length and width in the tool to find the square inch area.

Width:

cm ▾

Length:

m ▾

(Optional):

Related

Use the square inches calculator to quickly determine the area of any space in square inches. This tool also allows you to calculate the cost per square inch based on your entered price.

How to Calculate Square Inches?

To find the area in square inches, first identify the shape of the space. For a square, multiply the side lengths. For a rectangle, multiply length and width. You can also convert measurements from other units to square inches for precise calculations.

Formulas:

Square: Area = Side × Side
Rectangle: Area = Length × Width
Circle: Area = π × (Radius)²
Triangle: Area = 0.5 × Base × Height

Why Calculate in Square Inches?

Calculating in square inches is useful for small-scale projects where precision is important, such as flooring, countertops, or craft projects. One square inch represents a square with sides of 1 inch.

Unit Conversion to Square Inches:

Use these conversion factors to quickly convert other units to square inches:

Square Centimeters to Square Inches	Multiply by 0.155
Square Millimeters to Square Inches	Multiply by 0.00155
Square Meters to Square Inches	Multiply by 1550.0031
Square Feet to Square Inches	Multiply by 144
Square Yards to Square Inches	Multiply by 1296