Square Inches to Square Feet Converter
Convert square inches to square feet — 144 square inches to the square foot. Results update as you type; exact factors shown.
One square inch is 0.0069 square feet — see the exact factor, not a rounded rule of thumb.
How the square inches to square feet converter works
Areas convert through the square meter. Because the inch is exactly 25.4 mm, a square foot is exactly 0.09290304 m², an acre (43,560 square feet) is exactly 4,046.8564224 m² and a square mile (640 acres) is 2,589,988.110336 m². A hectare is 10,000 m² by definition.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common area conversions
| From | To | Units |
|---|---|---|
| 12 in² | 0.0833 ft² | square inchs to square feet |
| 24 in² | 0.1667 ft² | square inchs to square feet |
| 36 in² | 0.25 ft² | square inchs to square feet |
| 72 in² | 0.5 ft² | square inchs to square feet |
| 144 in² | 1 ft² | square inchs to square feet |
| 288 in² | 2 ft² | square inchs to square feet |
| 432 in² | 3 ft² | square inchs to square feet |
| 576 in² | 4 ft² | square inchs to square feet |
| 720 in² | 5 ft² | square inchs to square feet |
| 1,000 in² | 6.9444 ft² | square inchs to square feet |
| 1,440 in² | 10 ft² | square inchs to square feet |
| 14,400 in² | 100 ft² | square inchs to square feet |
Units in this converter and their exact factors
| Unit | Symbol | One unit in square meters |
|---|---|---|
| square millimeter | mm² | 0.000001 square meter |
| square centimeter | cm² | 0.0001 square meter |
| square meter | m² | 1 square meter |
| hectare | ha | 10,000 square meter |
| square kilometer | km² | 1,000,000 square meter |
| square inch | in² | 0.00064516 square meter |
| square foot | ft² | 0.09290304 square meter |
| square yard | yd² | 0.83612736 square meter |
| acre | ac | 4,046.8564224 square meter |
| square mile | mi² | 2,589,988.110336 square meter |
FAQFrequently asked questions about area conversion
How many square inches in a square foot?
Exactly 144 — twelve squared.
What is 288 in²?
Two square feet.
Why 144 and not 12?
Because area scales with the square of length. This is the single most common area-conversion error.
What is a square yard in square inches?
1,296 — nine square feet.
Where is this used?
Sheet materials, screen areas and anywhere a small area is specified in inches.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.