Square Inches to Square Feet Converter
This square inches to square feet converter turns an area in square inches into square feet as you type, to up to four decimal places. It works both ways: type in the square feet box and you get square inches back.
Common conversions
432 square inches is 3 square feet. Each size below is the square inches divided by 144.
Square inches to square feet table, 1 to 14,400 sq in
| Square inches | Square feet |
|---|---|
| 1 | 0.0069 |
| 36 | 0.25 |
| 72 | 0.5 |
| 100 | 0.6944 |
| 144 | 1 |
| 200 | 1.3889 |
| 288 | 2 |
| 432 | 3 |
| 500 | 3.4722 |
| 576 | 4 |
| 600 | 4.1667 |
| 720 | 5 |
| 864 | 6 |
| 900 | 6.25 |
| 1,000 | 6.9444 |
| 1,152 | 8 |
| 1,440 | 10 |
| 1,728 | 12 |
| 1,800 | 12.5 |
| 2,304 | 16 |
| 2,880 | 20 |
| 3,600 | 25 |
| 7,200 | 50 |
| 14,400 | 100 |
1,728 square inches is 12 square feet. Don't mix it up with 1,728 cubic inches, which is 1 cubic foot (12 × 12 × 12).
How to convert square inches to square feet
Divide square inches by 144. To go back, multiply square feet by 144.
Square feet = square inches ÷ 144
It's 144 because a square foot is 12 inches on each side, and area multiplies the two sides: 12 × 12 = 144.
Not 12: 12 converts inches to feet, a length. Divide square inches by 12 and the answer is 12 times too big, so a countertop of a few square feet looks like dozens.
Inches to square feet from length and width
Multiply the length by the width in inches, then divide by 144. A single inch measurement has no area, so you always need two sides.
- Measure both sides in inches. If the tape reads feet and inches, the feet and inches calculator handles mixed units.
- Multiply them to get square inches. A 12 by 24 inch tile is 288 square inches (2 square feet); the 24 by 18 inch panel below is 432.
- Divide by 144. 432 ÷ 144 = 3 square feet. Round only at the end.
Common tile and panel sizes in square feet
| Size (inches) | Square inches | Square feet |
|---|---|---|
| 4 × 4 | 16 | 0.1111 |
| 3 × 6 (subway tile) | 18 | 0.125 |
| 6 × 6 | 36 | 0.25 |
| 12 × 12 | 144 | 1 |
| 12 × 24 | 288 | 2 |
| 18 × 18 | 324 | 2.25 |
| 24 × 24 | 576 | 4 |
| 24 × 36 | 864 | 6 |
| 36 × 36 | 1,296 | 9 |
| 30 × 60 | 1,800 | 12.5 |
| 48 × 96 (4 × 8 ft sheet) | 4,608 | 32 |
Sizes are nominal; real tile is often a little smaller, so the tile calculator works from the area you're covering and adds waste for cuts. For whole rooms, see how to calculate square footage or add rooms up with the square footage calculator.
Square inches to other units
Each factor is the length conversion squared. The metric ones are exact because an inch is exactly 2.54 cm, as the NIST conversion factor tables show.
A yard is 36 inches, and 36 × 36 = 1,296.
Exactly × 0.00064516.
Exact.
Exact.
Already in square feet? Use the square feet to square yards converter for carpet or the square feet to square meters converter. Measured in metric? The square meter calculator multiplies the sides, and the area converter does every unit at once, acres and hectares included.
Common mistakes
Besides dividing by 12, mixed units and early rounding cause most wrong answers.
A panel 2 feet by 18 inches is 24 × 18 inches, which is 432 square inches or 3 square feet, not 2 × 18 = 36.
Keep the decimals until the last step, then round once.
Frequently asked questions
How many square inches are in a square foot?
There are 144. A square foot is 12 inches by 12 inches, and 12 × 12 = 144.
How many square feet is 1 square inch?
About 0.0069 square feet (1 ÷ 144 = 0.006944). It takes 144 of them to make one square foot.
Can I convert inches straight to square feet?
Not from one measurement, because inches measure length and square feet measure area. Multiply two sides in inches, then divide by 144: 24 by 36 inches is 864 square inches, or 6 square feet.
How many 12 by 12 tiles make a square foot?
One. A 12 by 12 inch tile is 144 square inches, so a 100 square foot floor takes 100 tiles before you add waste.
Can I convert square inches to cubic inches?
No. Square inches are area and cubic inches are volume, so you need a depth: area × depth in inches gives cubic inches. The same applies to a slab, which the square feet to cubic yards converter works out.
How do I convert square inches to square meters?
Divide by 1,550, or multiply by exactly 0.00064516. 1,000 square inches is 0.645 square meters.