In 1 square feet there are 144 square inches. Meanwhile in 1 square inches there are 0.006944 square feet. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Square inches to Square feet calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert square feet (ft²) to square inches (in²), use the area conversion based on inches per foot.
Example:
Tip: This works because area scales in two directions (length and width), so you square the 12-inch conversion.
There are 144 square inches in 1 square foot. A foot is 12 inches long, so the area is 12 inches by 12 inches. That makes 12 × 12 = 144 square inches.
Use this formula:
square inches = square feet × 144
Multiply the square feet value by 144 to get square inches.
Multiply the number of square feet by 144.
Example:
2.5 sq ft × 144 = 360 sq in
This works for whole numbers and decimals.
Because area uses squared units. One foot equals 12 inches, but one square foot equals 12 inches × 12 inches. That’s why the conversion factor is 144, not 12.
2 square feet = 2 × 144 = 288 square inches
You can scale this for any value using the same multiplier.
0.5 square feet = 0.5 × 144 = 72 square inches
Half a square foot equals 72 square inches.
Find the area in square feet first, then convert.
Example: A rectangle that is 3 ft by 2 ft:
Area in square feet: 3 × 2 = 6 sq ft
Convert to square inches: 6 × 144 = 864 sq in
Yes. If length and width are already in inches, multiply them to get square inches.
Example: 24 inches by 18 inches:
24 × 18 = 432 sq in
You don’t need square feet unless you want the area in both units.
A common mistake is multiplying by 12 instead of 144. That works for length, not area. Square feet measure area, so you must use 12 × 12.
The conversion rate stays the same. Only the area changes. Find the total area in square feet, subtract any cutouts (also in square feet), then multiply by 144 to get square inches.
Divide by 144:
square feet = square inches ÷ 144
Example:
720 sq in ÷ 144 = 5 sq ft
It helps when plans or materials use different units. It’s common for tile, sheet goods, crafts, printing, and small surface areas where inches give more detail.
The Calculate Box tool to convert square feet to square inches uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a square feet value in the box and have it instantly converted to square inches.