Square Inch Calculator
Quickly measure any surface in inches², feet², and cm².
Enter width and height once, and get all area results instantly.
Square Inch Calculator – fast area in square inches for rectangles.
Square Inch Calculator – Convert Inches to Area (ft² & cm²)
Calculate the area of any rectangle in square inches instantly.
Enter the width and height in inches, and the calculator will show results in
square inches, square feet, and square centimeters.
How to Calculate Square Inches
To find the area in square inches, simply multiply the width (in inches) by the height (in inches).
This method works for any rectangle or flat surface and is often used in print design, fabric measurement, or construction layouts.
Formula: Square Inches = Width × Height
Example: 12.5 × 8.25 = 103.13 in²
Equivalent conversions: 0.716 ft² or 665.32 cm²
Using this width × height inches calculator makes it easy to get precise area measurements
without doing manual math. Perfect for designers, builders, and anyone working with rectangular surfaces.
Conversion Table – Common Square Inch Values
Understanding how square inches relate to other units such as
square feet and square centimeters can help you make quick and accurate area conversions.
Below is a simple square inch conversion chart showing common values you can reference at a glance.
Square Inches (in²) | Square Feet (ft²) | Square Centimeters (cm²) |
---|---|---|
1 in² | 0.00694 ft² | 6.4516 cm² |
10 in² | 0.0694 ft² | 64.516 cm² |
50 in² | 0.347 ft² | 322.58 cm² |
100 in² | 0.694 ft² | 645.16 cm² |
500 in² | 3.47 ft² | 3225.8 cm² |
You can use this chart to quickly convert square inches to square feet or
square centimeters without manual calculations. For more precise or custom conversions,
use the calculator above to enter any width and height values you need.
How to Use the Square Inch Calculator
This online square inch calculator is simple to use and works instantly on any device.
Just follow these quick steps to calculate the total area of your surface:
- Enter the width and height in inches — you’ll usually find these on product specs (TVs, paper, furniture, tiles) or labels.
If not, measure them yourself using a ruler or tape measure marked in inches. - Click “Convert” to calculate the area automatically.
- View results instantly in square inches (in²), plus automatic conversions to square feet (ft²) and square centimeters (cm²).
- Use “Copy results” to copy your output or share it for work, printing, or design calculations.
💡 Pro Tip for U.S. users:
When dimensions are listed in feet (e.g., 2 ft × 3 ft), multiply by 12 to convert each side to inches before entering them.
For example, 2 ft = 24 in and 3 ft = 36 in, so 24 × 36 = 864 square inches.
Try entering values like 12 × 8 to see how it works — this free square inch calculator
gives instant results and helps you quickly find square inches for any rectangle.
Formula & Unit Conversion
The area conversion formulas below show how the calculator converts between
square inches, square feet, and square centimeters.
These are the same equations used in architecture, printing, and product measurements across the U.S.
Square Inches (in²) = Width × Height
Square Feet (ft²) = in² ÷ 144
Square Centimeters (cm²) = in² × 6.4516
For example, if you have a 10 × 20 inch surface, the total area equals 200 in².
Dividing by 144 gives 1.39 ft², and multiplying by 6.4516 equals 1,290.32 cm².
🔹 Results are rounded to two decimal places for convenience and consistency across units.
Example Calculations
Here are a few real-world examples showing how to calculate square inches for common rectangle sizes.
These examples help visualize how width and height values convert into total area measurements.
Example 1: 12 × 8 inches = 96 in²
Equivalent to 0.667 ft² or 619.35 cm²
Common use: small poster, laptop screen, or craft material.
Example 2: 15 × 10 inches = 150 in²
Equivalent to 1.04 ft² or 967.74 cm²
Common use: medium wall frame or tablet surface.
Example 3: 24 × 36 inches = 864 in²
Equivalent to 6 ft² or 5574.62 cm²
Common use: movie poster or large photo print.
These area examples in inches show how quickly you can find the total surface size for any rectangular object.
Try your own dimensions above to get instant conversions using our square inch calculator online.
FAQs – Square Inches Explained
1. What does “square inch” mean?
A square inch is a unit of area equal to a square measuring one inch on each side. It’s commonly used in the U.S. for small surfaces like screens, photos, tiles, or labels.
2. How do you find square inches from inches?
Multiply the width (in inches) by the height (in inches). For example, 12 × 8 = 96 square inches.
3. How many square inches are in one square foot?
There are exactly 144 square inches in one square foot (12 × 12).
4. Can I convert square inches to cm² or ft²?
Yes. Divide by 144 to get square feet, or multiply by 6.4516 to get square centimeters. You can also use the converter above for instant results.
5. Is a square inch the same as an inch squared?
Yes — both mean the same thing. “Inch squared” simply describes the mathematical operation (in × in), while “square inch” is the formal area unit.
6. Can I calculate irregular shapes in square inches?
Yes, but you’ll need to break the shape into smaller rectangles or triangles, calculate each area, then add them together for a total surface measurement.
Conclusion & Related Tool
The Square Inch Calculator makes it quick and effortless to measure any rectangular surface.
Whether you’re working on a print project, home decor, or DIY design, this tool gives you instant and accurate conversions.
🔄 Looking for the reverse calculation? Try our
Missing Side Calculator
— it helps you find a missing width or height when you already know the total area.
ℹ️ For more background on area measurement and square-inch conversions, see the
Wikipedia article on Square Inch.