Square inch (in²)
A square one inch on each side.
What is a square inch?
- Symbol
- in²
- Quantity
- Area
- Unit system
- US customary
- Definition
- A square one inch on each side.
- Exact
- Yes, the value is exact by definition
- Source
- International yard and pound agreement (1959)
Common applications
Used in the United States for small surfaces, and as the area part of pressure units such as psi.
Square inch in other area units
- 1 in² = 645.16 mm²Square millimeter
- 1 in² = 6.4516 cm²Square inch to Square centimeter converter
- 1 in² = 0.00064516 m²Square meter
- 1 in² = 6.4516e-8 haHectare
- 1 in² = 6.4516e-10 km²Square kilometer
- 1 in² ≈ 0.006944444444 ft²Square foot
- 1 in² ≈ 0.0007716049383 yd²Square yard
- 1 in² ≈ 1.594225079e-7 acAcre
- 1 in² ≈ 2.490976686e-10 mi²Square mile
Square inch quick reference
| Square inch | Square centimeter | Square meter | Square foot |
|---|---|---|---|
| 1 in² | = 6.4516 cm² | = 0.00064516 m² | ≈ 0.006944444444 ft² |
| 10 in² | = 64.516 cm² | = 0.0064516 m² | ≈ 0.06944444444 ft² |
| 100 in² | = 645.16 cm² | = 0.064516 m² | ≈ 0.6944444444 ft² |
| 1000 in² | = 6451.6 cm² | = 0.64516 m² | ≈ 6.944444444 ft² |
Where the square inch fits
The next smaller area unit is the square centimeter (cm²). 1 in² = 6.4516 cm², and 1 cm² ≈ 0.15500031 in².
The next larger area unit is the square foot (ft²). 1 in² ≈ 0.006944444444 ft², and 1 ft² = 144 in².
Frequently asked questions
- How many square centimeters are in one square inch?
- One square inch = 6.4516 cm² (square centimeters).
- How many square meters are in one square inch?
- One square inch = 0.00064516 m² (square meters).
- How many square feet are in one square inch?
- One square inch ≈ 0.006944444444 ft² (square feet).